built-in self-test and calibration of mixed-signal devices ph.d final exam wei jiang advisor:...
Post on 22-Dec-2015
213 views
TRANSCRIPT
![Page 1: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/1.jpg)
Built-In Self-Test and Calibration of Mixed-Signal
DevicesPh.D Final Exam
Wei Jiang
Advisor: Vishwani D. AgrawalUniversity ReaderMinseo Park
Committee Members: Fa F. DaiVictor P. NelsonAdit D. Singh
March 24 2011
![Page 2: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/2.jpg)
Outline
• Introduction• Background• BIST Architecture for Mixed-Signal Devices
– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• Conclusion
Wei Jiang General Final Exam 2
![Page 3: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/3.jpg)
Motivation
• Digital BIST techniques– Defect-oriented– Logic BIST, scan chain, boundary scan,
JTAG, etc• Mixed-Signal BIST techniques
– Specification-oriented– No universally accepted standard– Issues
• Parameter deviation• Process variation
Wei Jiang General Final Exam 3
![Page 4: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/4.jpg)
Approach
• Problem– Design a post-fabrication variation-
tolerant process-independent technique for mixed-signal devices
• Solution– Test and characterize mixed-signal
devices using digital circuitry– Use DSP as BIST controller for test pattern
generation (TPG) and output data analysis (ORA)
– Calibrate mixed-signal devicesWei Jiang General Final Exam 4
![Page 5: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/5.jpg)
Mixed-Signal Devices
• Both digital and analog circuitry in single die– DSP usually embedded for data processing– Analog circuitry controllable by digital part
• Converters– Analog-to-digital converter (ADC)
• Flash ADC, successive-approximation ADC, Pipeline ADC, Sigma-Delta ADC
– Digital-to-analog converter (DAC)• PWM/Oversampling DAC, Binary-weighted DAC
Wei Jiang General Final Exam 5
![Page 6: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/6.jpg)
Testing of Mixed-Signal Devices• Both digital and analog circuitry need
test• Defects and faults
– Catastrophic faults (hard faults)– Parametric faults (soft faults)
• Test approaches– Functional test (specification oriented)– Structural test (defect oriented)
Wei Jiang General Final Exam 6
![Page 7: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/7.jpg)
Digital BIST
• Conventional logic BIST technology• LFSR-based random test; Scan-based
deterministic test• DSP can be TPG and ORA• Digital circuitry must be fault-free
before being used for mixed-signal test
• May be hardware or software based
Wei Jiang General Final Exam 7
![Page 8: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/8.jpg)
Faulty Mixed-Signal Circuitry• Good circuitry
– All parameters and characteristics are within pre-defined specified range
• Fault-tolerance factor– Post-fabrication and software-controllable– Trade-off between fault-tolerance of
parameter deviation and calibration resolution
– Larger value for wider fixing range; smaller one for better fixing results
– Fault-tolerance factor may vary for different applications
Wei Jiang General Final Exam 8
![Page 9: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/9.jpg)
A Basic Digital BIST Architecture
Wei Jiang General Final Exam 9
Digital Circuit-under-test
(CUT)
BIST CONTROLLER
TPG ORA
enable enable
![Page 10: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/10.jpg)
Challenges
• Analog circuitry– No convincing fault model– Difficult to identify faults– Device parameters more susceptible to
process variation than digital circuitry– Fault-free behavior based on a known range
of acceptable values for component parameters
• Large statistical process variation effects in deep sub-micron MOSFET devices
Wei Jiang General Final Exam 10
![Page 11: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/11.jpg)
Process Variation
• Parameter variation in nanoscale process• Yield, reliability and cost• Feature size scaling down and performance
improvement• Effects on digital and analog circuitry
– Analog circuitry more affected by process variation– Parameter deviation severed in nanoscale process– System performance degraded when parameter
deviation exceeds beyond tolerant limits
Wei Jiang General Final Exam 11
![Page 12: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/12.jpg)
Outline
• Introduction• Background• BIST Architecture for Mixed-Signal
Devices– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 12
![Page 13: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/13.jpg)
Resolution and Non-linearity Error• Resolution: N-bit• Least significant bit
(LSB)
• Non-linearity errors– Differential non-
linearity (DNL)– Integral non-
linearity (INL)
Wei Jiang 13
kLSB
vvDNLINL
LSB
vvDNL
VLSB
kk
ikk
kkk
DDN
0
1
1 1
2
1
General Final Exam
![Page 14: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/14.jpg)
Non-linearity Error of ADC
• Signal values at lower and upper edges of each codes
Wei Jiang 14
kkk
k
ikk
kkk
kkk
kk
kk
DNLINL
LSBDNL
LSB
LSB
2
ˆˆ2
ˆˆ2
ˆˆ
5.0ˆ
5.0ˆ
1
1
2
1
1
General Final Exam
![Page 15: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/15.jpg)
Non-linearity Error of ADC/DAC
Wei Jiang General Final Exam 15
Analog input
Dig
ital c
ode
outp
ut
Ideal
Actual (νK)
Ideal
Actual (νK)
Ana
log
outp
ut
Digital code input
Non-linearity error of ADC Non-linearity error of DAC
k
kν
ν
Non-linearity error
Non-linearity
error
![Page 16: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/16.jpg)
Noise and SNR
Wei Jiang 16General Final Exam
input
output
1
-1
Δ/2
-Δ/2
3Δ/2
-3Δ/2
Δ: LSBN: number of bit
76.102.612
1281
log10
128
112
022
1
2
22
10
22
222
NSNR
P
PSNR
P
deeepe
otherwise
eifep
N
noise
signal
N
rms
![Page 17: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/17.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 17
![Page 18: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/18.jpg)
Typical Mixed-Signal Architecture
Wei Jiang General Final Exam 18
![Page 19: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/19.jpg)
Mixed-Signal System Test Architecture
Wei Jiang General Final Exam 19
* F. F. Dai and C. E. Stroud, “Analog and Mixed-Signal Test Architectures,” Chapter 15, p. 722 in System-on-Chip Test Architectures: Nanometer Design for Testability, Morgan Kaufmann, 2008.
![Page 20: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/20.jpg)
Test Architecture
• Digital system– Digital I/O, digital loopback– Digital signal processor (DSP)– TPG and ORA and test control unit
• Mixed-signal system– DAC and ADC, Analog loopback
• Analog system– Analog circuitry– Analog signal I/O, analog I/O loopback
Wei Jiang General Final Exam 20
![Page 21: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/21.jpg)
Available Testing Approaches• Servo-loop Method• Oscillation BIST Method• Sigma-Delta Testing Method• FFT-based Testing Method• Histogram Testing Method
– Widely used for testing of on-chip ADC/DAC– Need large amount of samples and slow-
gain current source– Unsuitable for high-resolution converters
Wei Jiang General Final Exam 21
![Page 22: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/22.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 22
![Page 23: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/23.jpg)
Simplified Mixed-Signal System
Wei Jiang 23General Oral Examination
![Page 24: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/24.jpg)
Proposed Approach
Wei Jiang General Final Exam 24
DSP
ADCunder-test
DACunder-test
m-ADC
Signal Generator
Analog System
d-DAC Polynomial evaluation
N
N
NDiagnosis
TPG
TPG
![Page 25: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/25.jpg)
Testing Components
• Analog Signal Generator (ASG)– Linear ramp signals– Sinusoidal signals
• Measuring ADC (m-ADC)– High-resolution and high linearity– First-order single-bit Sigma-Delta ADC
• Dithering DAC (d-DAC)– Low resolution and low cost– Output voltage: specified error-tolerant
range– Polynomial evaluation unit
Wei Jiang General Final Exam 25
![Page 26: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/26.jpg)
Design of Ramp Signal Generator
Wei Jiang General Final Exam 26
Switch for resetting ramp
I I
I/19.5
ΔV+Vth ΔV
Range: 0 v~ Vdd-ΔV
Carefully chosen to make ΔV ≈ 0
![Page 27: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/27.jpg)
Sinusoidal Testing Signal
• More complex design• Used for dynamic testing (non-
linearity (IP3), dynamic range, harmonic distortion)
• Fast Fourier Transformation (FFT) by DSP required
• Optional in the proposed BIST approach
Wei Jiang General Final Exam 27
![Page 28: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/28.jpg)
Testing Components
• Measuring ADC (m-ADC)– First-order single-bit Sigma-Delta ADC– ENOB determined by oversampling ratio
• Dithering DAC (d-DAC)– Low resolution DAC: binary-weighted– Fault-tolerance factor
Wei Jiang General Final Exam 28
76.102.68
3log10 3
210 ENOBOSRSNRdB
![Page 29: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/29.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 29
![Page 30: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/30.jpg)
Testing Steps
• Diagnosis of testing components• Testing of on-chip ADC using analog
testing signals• Testing of on-chip DAC using
embedded DSP and measuring ADC• Calibration of on-chip DAC using
dithering DAC• Validation of DAC calibration results
using on-chip ADC/DAC
Wei Jiang General Final Exam 30
![Page 31: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/31.jpg)
Diagnosis of Testing Components
Wei Jiang General Final Exam 31
DSP
DACunder-test
m-ADC
Signal Generator
d-DAC
0
N
NDiagnosis
TPG
TPG
*Assume non-linearities in signal generator and d-DAC do NOT match
![Page 32: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/32.jpg)
Diagnosis of Testing Components• ASG and m-ADC
– Analog signal generated; usually linear ramp– m-ADC measures analog signals– DSP determines gain and offset of measurements
• d-DAC and m-ADC– DSP makes on-chip DAC output constant 0– DSP generates digital test patterns; usually linear
ramp– m-ADC measures d-DAC outputs– DSP determines gain and offset of measurements
•Only situation that fault undetected– ASG and d-DAC have exactly same non-linearity
errors
Wei Jiang General Final Exam 32
![Page 33: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/33.jpg)
Testing of ADC
• Similar to histogram testing method
Wei Jiang General Final Exam 33
DSPADC
under-test
Signal Generator
Analog System
N
![Page 34: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/34.jpg)
Testing of ADC
• Divided full-range of ADC codes into two equal-size sections
• Sum up measurements of each section
• Lower bound M(0) and upper bound M(K) are discarded because of possible out-of-range measurements
Wei Jiang General Final Exam 34
X
s0 s1
0 n/2 n
baxy
![Page 35: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/35.jpg)
Estimating Coefficients
Wei Jiang General Final Exam 35
KbaTKKLSB
kfLSB
kMs
KbaTKKLSB
kfLSB
kMs
K
Kk
K
Kk
K
k
K
k
2
122
8
11
1
2
12
8
11
1
1
2/
1
2/1
2/
1
2/
10
2
421
1
2
41
1
3
24
11
011
0
011
010
KK
SSKS
LSBb
TKK
S
LSBa
baTKLSB
ssS
aTKKLSB
ssS
![Page 36: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/36.jpg)
Detailed Steps• Reset ramp testing signal generator• Detect first non-zero ADC output (lower-bound of
samples)• Measure all subsequent samples• Stop at the maximum ADC output (upper-bound of
samples)• DSP collects all valid measurements and start to
processing data• Divide measured samples into two equal-size parts• Accumulate measurements of each part to obtain two
sums• Calculate two syndromes from two sums• Calculate two estimated coefficients of the linear ramp
function• (Optional) Compare each measured data to estimated one
from ramp function
Wei Jiang General Final Exam 36
![Page 37: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/37.jpg)
Simulation Results
DNL and INL Estimation results
Wei Jiang General Final Exam 37
![Page 38: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/38.jpg)
Other considerations
• Minimal number of samples– More samples, less quantization noise, more
accurate estimation– Not all codes need to be sampled in order to
reduce testing time– At least 2N-2 samples are found necessary in
practice
• The same idea may be used with low-frequency sinusoidal testing signals instead of ramp signal– More overhead and complexities with
sinusoidal generator
Wei Jiang 38General Final Exam
![Page 39: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/39.jpg)
Testing of DAC
• DSP as both TPG and ORA
Wei Jiang General Final Exam 39
DSP
DACunder-test
m-ADCAnalog System
d-DAC Polynomial evaluation
0
N
Diagnosis TPG
TPG
N
![Page 40: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/40.jpg)
Test of DAC
Wei Jiang General Final Exam 40
BIST CONTROL
DACunder-test
1st-order 1-bit ΣΔ Modulator
LPFDigital Filter
Ramp code generator
Characteristics analysis
Pass/fail indicator
Offset,Gain,2nd and 3rd harmonic distortion
Coefficientsfor polynomial evaluation
14
ΣΔ ADC
Polynomial evaluation
Dithering DAC
![Page 41: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/41.jpg)
Components• Digital circuitry (including DSP) as BIST control
unit– Test pattern generation (TPG) and output response
analysis (ORA) • Measuring ADC
– First-order 1-bit Sigma-Delta modulator– Digital low-pass filter– Measuring outputs of DAC-under-test
• Dither DAC (not used)– Low resolution DAC– Generating correcting signal for calibration– Calibrated DAC for test of ADC-under-test
• ADC Polynomial Fix (not used during testing)– Digital process to revise ADC output codes
Wei Jiang General Final Exam 41
![Page 42: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/42.jpg)
Polynomial Fitting Algorithm• Introduced by Sunter et al.
in ITC’97 and A. Roy et al. in ITC’02
• Summary:– Divide DAC transfer
function into four sections
– Combine function outputs of each section (S0, S1, S2, S3)
– Calculate four coefficients (b0, b1, b2, b3) by easily-generated equations
Wei Jiang General Final Exam 42
33
2210 xbxbxbby
![Page 43: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/43.jpg)
Third-order Polynomial
• Offset• Gain• And
Harmonic Distortion
Wei Jiang General Final Exam 43
343
232
3121
200
01233
01232
01231
01230
33
2210
3
128
163
443
41
33
Bn
b
Bn
b
BBn
b
BBn
b
SSSSB
SSSSB
SSSSB
SSSSB
xbxbxbby
![Page 44: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/44.jpg)
Simulation ResultsINL of 14-bit DAC Results of fitting polynomial
Wei Jiang General Final Exam 44
Oversampling ratio for m-ADC
219510
8
3log1076.102.6
30
2.1476.11402.6
3210
OSR
OSRNSNRdB
![Page 45: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/45.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC– Calibration of DAC
• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 45
![Page 46: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/46.jpg)
Calibration of DAC
Wei Jiang General Final Exam 46
• The output of calibrated DAC can be considered as linear
DACunder-test
Polynomial evaluation
Dithering DAC
coefficients
DSP14
![Page 47: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/47.jpg)
Dithering DAC • low-
resolution DAC
• Better linearity output with DEM
• Must be tested by measuring ADC before test of on-chip mixed-signal devices
Wei Jiang General Final Exam 47
3
α=1
17bits
Resolution of dithering-DAC (bits)
Overs
am
plin
g r
ati
o (
OS
R)
2
![Page 48: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/48.jpg)
Polynomial Evaluation
• Either hardware or software implementation
• Hardware Implementation– Faster and DSP not occupied– High overhead due to huge block of
digital multiply circuit• Software Implementation
– DSP drives both on-chip DAC and dithering DAC with calculated value
– Performance penaltyWei Jiang General Final Exam 48
![Page 49: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/49.jpg)
Simulation Results
d-DAC errors Calibration results
Wei Jiang General Final Exam 49
![Page 50: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/50.jpg)
Verification of ADC/DAC
Wei Jiang General Final Exam 50
*OPTIONAL
![Page 51: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/51.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC
– Calibration of DAC• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 51
![Page 52: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/52.jpg)
Measuring ADC
• First-order single-bit sigma-delta ADC• Diagnosis performed before mixed-
signal test• In-band quantization noise moved up
due to oversampling and noise shaping
• Higher-order multiple-bit Sigma-Delta ADC can also be used
Wei Jiang General Final Exam 52
![Page 53: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/53.jpg)
Sigma-Delta Modulator
• First-order single-bit
• Diagram
• Transfer function
Wei Jiang General Final Exam 53
zEzzXzzY 11 1
![Page 54: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/54.jpg)
Oversampling and Noise shaping
Wei Jiang General Final Exam 54
H(s)
InputX(s)
OutputY(s)
Quantizer
ErrorE(s)
)()(1
1)(
)(1
)()( sE
sHsX
sH
sHsY
* F. F. Dai and C. E. Stroud, “ΣΔ Modulation for Factional-N Synthesis ” Chapter 9, p. 307 in System-on-Chip Test Architectures: Nanometer Design for Testability, Morgan Kaufmann, 2008.
Ou
tpu
t
Frequency
fin fs/2
H(s)
sf6
2
Quantization noise
Ou
tpu
t
Quantization noise
fin fs/2
H(s)
sf6
2
Oversampling without feedback
Oversampling with noise shaping feedback
1+H(s)
1
Frequency
![Page 55: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/55.jpg)
Sigma-Delta Modulator
• Oversampling Ratio• Signal-to-noise-distortion Ratio
• Signal-to-noise Ratio
• First-order
Wei Jiang General Final Exam 55
d
s
f
fOSR
2
OSRNSNDR 2log376.102.6
32102
010
32
220
8
3log10
8
1log10
3
OSRn
SNR
OSRen rms
![Page 56: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/56.jpg)
Sigma-Delta Modulator
• Second-order
• Higher order
Wei Jiang General Final Exam 56
5410
54
220
8
5log10
5
OSRSNR
OSRen rms
12210
122
220
8
12log10
12
nn
nn
rms
OSRn
SNR
OSRn
en
![Page 57: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/57.jpg)
Select Proper Order
Wei Jiang General Final Exam 57
First-order
Second-order
Third-order
17-bit ENOB104.1LSB
Oversampling ratio (OSR)
![Page 58: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/58.jpg)
Multiple Bits
• N: NOB of quantizer
• n: order of ΣΔ modulator
Wei Jiang General Final Exam 58
12log66.1log
2
12
12log10log12376.102.6
122
2
3log10
1212
1281
log10
12
2
102
2
102
2122
10
1222
2
10
122
220
nOSR
nNN
nOSRnN
nOSR
OSRn
SNR
OSRn
en
n
effective
n
nnN
nn
N
nn
rms
![Page 59: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/59.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC
– Calibration of DAC• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 59
![Page 60: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/60.jpg)
Polynomial Fitting
• Different order of fitting polynomial can be used for various applications– Linear fitting– Second-order fitting– Third-order fitting– Higher order fitting
• Computation complexity and hardware overhead increase exponentially
Wei Jiang General Final Exam 60
22
1NO
NNO
![Page 61: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/61.jpg)
Linear Fitting
Wei Jiang General Final Exam 61
b
na
ndkys
bn
an
dkys
kbay
n
k
n k
k
82
822
2
01
20
20
14
1
4
2
0
2
011
010
Sn
b
Sn
a
bn
ssS
anssS
![Page 62: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/62.jpg)
Second-order Fitting
Wei Jiang General Final Exam 62
cn
bn
an
dkys
cn
an
dkys
cn
bn
an
dkys
kckbay
n
n k
n
n k
n
n k
k
324
13
93
3243
324
13
93
322
6
2
36
2
1
326
2
0
2
![Page 63: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/63.jpg)
Second-order Fitting
Wei Jiang General Final Exam 63
cn
sssS
bn
ssS
ansssS
27
22
9
2826
3
0123
2
021
0120
23
12
0
2
272
98
1
Sn
c
Sn
b
Sn
a
![Page 64: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/64.jpg)
Third-order Fitting
Wei Jiang General Final Exam 64
34
23
312
20
01233
01232
01231
01230
32
3
128
163
443
41
33
Sn
d
Sn
c
SSn
b
SSn
a
ssssS
ssssS
ssssS
ssssS
dxcxbxay
![Page 65: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/65.jpg)
Comparison of different orders
Wei Jiang General Final Exam 65
![Page 66: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/66.jpg)
Higher-Order Fitting
• Possibly better fitting result• Impractical for hardware
implementation due to huge overhead• Expressions on calculation of
coefficients can be derived in the same way
• Usually third-order polynomial fitting is sufficient for the most applications
Wei Jiang General Final Exam 66
![Page 67: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/67.jpg)
Adaptive Polynomial Fitting
• Dynamically choose polynomial degree• Low-order polynomial
– Simple to design and implement– Less area and performance overhead– Large fitting error
• High-order polynomial– Better fitting results– More coefficients to store– Much more complicated polynomial
evaluation circuitry design and heavy area and performance overhead
Wei Jiang General Final Exam 67
![Page 68: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/68.jpg)
Implementation
• Analog Signal Generator (ASG)– A few transistors; low overhead
• Measuring ADC (m-ADC)– First-order 1-bit Sigma-Delta ADC; low
overhead
• Dithering DAC (d-DAC)– Low resolution DAC; low overhead
• Polynomial Evaluation Unit (HW)– Multiply-accumulate Logic; huge overhead
Wei Jiang General Final Exam 68
![Page 69: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/69.jpg)
Truncation Error
Wei Jiang General Final Exam 69
•12-bit is sufficient for a10-bit DAC (above); 16-bit for 12-bit DAC (below)
Truncation Error (LSB)
LinearSecond-
orderThird-order
Higher
4-bit 64.296 77.474 84.6201 88.622
8-bit 3.2427 5.0105 5.8187 6.2390
12-bit 0 0.28352 0.37217 0.40544
16-bit 0 0.010821 0.023578 0.025812
Truncation Error (LSB)
LinearSecond-
orderThird-order
Higher
4-bit 255.30 309.60 337.97 354.91
8-bit 15.251 20.358 23.170 25.054
12-bit 0 1.2515 1.4993 1.6491
16-bit 0 0.070815 0.094711 0.10523
![Page 70: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/70.jpg)
Truncation Error
Truncation Error (LSB)
LinearSecond-
orderThird-order
Higher
4-bit 1023.3 1237.9 1351.3 1419.5
8-bit 63.252 81.181 92.521 100.141
12-bit 3.2405 5.1244 5.9794 6.5742
16-bit 0 0.31280 0.37720 0.42131
20-bit 0 0.017700 0.023781 0.026617
24-bit 0 0.00067559 0.0014819 0.0016703
Wei Jiang General Final Exam 70
* 16-bit is sufficient for calibration of a14-bit DAC; 17-bit could be better
![Page 71: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/71.jpg)
Hardware Overhead
Wei Jiang General Final Exam 71
Overhead (Gates/DFF
s)Linear
Second-order
Third-order
Higher
4-bit 216 38 495 87 866 153 1329 235
8-bit 357 63 863 152 1556 275 2334 430
12-bit 520 92 1281 226 2322 410 3642 643
16-bit 658 116 1646 291 3009 531 4743 837
20-bit 820 145 2064 364 3775 666 7218 1274
24-bit 959 169 2432 429 4464 788 8580 1514
* Synthesized with TSMC018 library; approximately in count of NAND2/DFFX1
![Page 72: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/72.jpg)
Testing Time
• Variables– N: resolution of on-chip ADC/DAC– T: sample/conversion time of ADC/DAC– M: OSR for Sigma-Delta modulator– N’: resolution of d-DAC
• Example– 14-bit ADC/DAC with 10ns conversion
time– Oversampling ratio of ΣΔ is 2000– 6-bit d-DAC for calibration
Wei Jiang General Final Exam 72
![Page 73: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/73.jpg)
Testing Time
• Diagnosis– ASG and m-ADC: Td1
– d-DAC and m-ADC: Td2
• Test of ADC: Tad
• Test of DAC: Tda
• Verification of ADC/DAC: Tv
• Total testing time:– Assume T=10ns, M=2000,N=14, N’=6– Total time = 657ms
Wei Jiang General Final Exam 73
TT
TMT
TT
TMT
TMT
Nv
Nda
Nad
Nd
Nd
2
2
2
2
2'
2
1
MTMTT NNtotal '
212 1
![Page 74: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/74.jpg)
Outline
• Introduction• Background
• BIST Architecture for Mixed-Signal Devices– Overview of Proposed Architecture– Test of DAC/ADC
– Calibration of DAC• Sigma-Delta Modulation• Polynomial Fitting Algorithm• ConclusionWei Jiang General Final Exam 74
![Page 75: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/75.jpg)
General Mixed-Signal Test
• Variation-tolerant design• Digital controlled BIST• Digitalized TPG/ORA• Self-testable measuring components• Characterization of device-under-test
by DSP• Faulty circuitry determined by
characterized parameters• Coefficients of output fix/correction
signals calculated by DSPWei Jiang General Final Exam 75
![Page 76: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/76.jpg)
Conclusion
• A post-fabrication built-in test and calibration approach for mixed-signal devices is proposed
• This approach relies on digital circuitry and DSP for TPG/ORA and BIST control
• Digital circuitry is testable by conventional digital testing approaches and therefore guarantee the testability of analog circuitry
• On-chip ADC/DAC are tested separately and verified
• Calibration on mixed-signal devices will significantly reduce defects, improve die yield and lower manufacturing cost
Wei Jiang General Final Exam 76
![Page 77: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/77.jpg)
Publications• W. Jiang and V. D. Agrawal, “Built-In Test and Calibration of
DAC/ADC Using A Low-Resolution Dithering DAC,” NATW’08, pp. 61-68.
• W. Jiang and V. D. Agrawal, “Built-in Self-Calibration of On-Chip DAC and ADC,” ITC’08, paper 32.2.
• W. Jiang and V. D. Agrawal, “Built-in Adaptive Test and Calibration of DAC,” NATW’09, pp. 3-8.
• W. Jiang and V. D. Agrawal, “Designing Variation-Tolerance in Mixed-Signal Components of a System-on-Chip,” ISCAS’09, pp. 126-129.
• W. Jiang and V.D. Agrawal, “A DSP-Based Ramp Test for On-Chip High-Resolution ADC,” ICIT’11
![Page 78: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/78.jpg)
References• M. L. Bushnell and V. D. Agrawal, “Essentials of Testing for
Digital, Memory, & Mixed-Signal VLSI Circuits,” Boston: Springer, 2000
• F. F. Dai and C. E. Stroud, “Analog and Mixed-Signal Test Architecture,” Morgan kaufmann, 2008.
• S. Sunter and N. Nagi, “A Simplified Polynomial Fitting Algorithm for DAC and ADC BIST,” ITC’97, pp.389-395
• A. Roy, S. Sunter et al., “High Accuracy Stimulus Generation for A/D Converter BIST,” ITC’02, pp.1031-1039
Wei Jiang General Final Exam 78
![Page 79: Built-In Self-Test and Calibration of Mixed-Signal Devices Ph.D Final Exam Wei Jiang Advisor: Vishwani D. Agrawal University Reader Minseo Park Committee](https://reader035.vdocuments.us/reader035/viewer/2022062715/56649d785503460f94a5b0de/html5/thumbnails/79.jpg)
THANK YOU
Wei Jiang 79General Final Exam