final design review of a 1 ghz lna / down-converter charles baylis university of south florida april...
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![Page 1: Final Design Review of a 1 GHz LNA / Down-Converter Charles Baylis University of South Florida April 22, 2005](https://reader035.vdocuments.us/reader035/viewer/2022062809/5697bfa51a28abf838c97c0e/html5/thumbnails/1.jpg)
Final Design Review of a 1 GHz LNA / Down-Converter
Charles Baylis
University of South Florida
April 22, 2005
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LNA Design Summary
IBM SiGe Design Kit - 4 layers of metal Load resistance = 50 ohms (Filter) Feedback Resistor from collector to base
stabilizes circuit, provides better matching For feedback configuration
IC = 6 mA, RF = 460 ohms (initial – values were changed for final schematic.
50
131.61
om R
AG )50)(131.6()1( OF RAR
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LNA Design Summary
Power Consumption: Current through gain transistor + 1 mA reference current through current mirror.
LC Match on Input/Output “De-Q” Inductors with resistors to
improve bandwidth.
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LNA Schematic
9.3 pF6.5 nH
83 pF
560 Ω
27 pF
1.4 kΩ7.3 nH
4.5 pF
650 Ω
Input
Output
Ground
Vcc
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LNA Gain
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LNA Noise Figure
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LNA Input IP3
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LNA Input/Output Match
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LNA ComplianceReqt. Spec. Min Spec. Max Minimum Maximum Pass/Fail
DC Current - 10 mA - 9.8 mA Pass
Gain 14.5 dB 17.5 dB 16.5 dB 16.9 dB Pass
Noise Figure
- 2.5 dB 2.3 dB 2.8 dB Fail
Input IP3 -20 dBm - -2.7 dBm - Pass
Uncond. Stability
- - - - Pass
Input Return Loss
15.0 dB - 15.7 dB 20.9 dB Pass
Output Return Loss
15.0 dB - 15.0 dB 30.3 dB Pass
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LNA Compliance-TemperatureReqt. Spec.
MinSpec. Max
Minimum Maximum Pass/Fail
DC Current - 10 mA 9.3 mA (-20˚) 10.2 mA (70˚) Fail
Gain 14.5 dB 17.5 dB 16.0 dB (70˚) 17.5 dB (-20˚) Pass
Noise Figure
- 2.5 dB 1.93 dB (-20˚) 3.24 dB (70˚) Fail
Uncond. Stability
- - - - Pass
Input Return Loss
15.0 dB - 14.7 dB (-20˚) 21.6 dB (70˚) Fail
Output Return Loss
15.0 dB - 14.0 dB (70˚) 31.4 dB (-20˚) Fail
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LNA Compliance - BiasReqt. Spec.Min SpecMax Minimum Maximum Pass/Fail
DC Current - 10 mA 8.1 mA (2.7 V) 11.6 mA (3.3 V)
Fail
Gain 14.5 dB 17.5 dB 14.9 dB (2.7 V)
18.0 dB (3.3V)
Fail
Noise Figure
- 2.5 dB 2.3 dB (3.3 V) 2.9 dB (2.7 V)
Fail
Uncond.Stability
- - - - Pass
Input ReturnLoss
15.0 dB - 12.9 dB (3.3 V)
22.2 dB (3.3V)
Fail
OutputReturnLoss
15.0 dB - 10.7 dB (2.7 V)
30.3 dB (3 V)
Fail
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LNA Layout
LNA In
Vcc
LNA Out
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Mixer Design Approach
fRF = 1 GHz, fLO = 860 MHz, fIF = 140 MHz Conversion gain = 9 dB = 2.82
Output Resistance = 50 ΩRL= 25 Ω
Solve conversion gain equation for gm (gives starting value for current IC1)..
Use LC network for input matching.
82.22 1
ML
v
gRA
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Mixer Design Approach
Noise figure improved by shrinking reference transistor for current mirror (and associated current). Also, beta helper transistor size was increased.
As in LNA, “de-Q” inductors with shunt resistors to improve bandwidth.
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Mixer Schematic
Input
Out + Out -7.03 kΩ
7 kΩ
Vcc
Ground
7.8 nH
3.7 pF
250 Ω83 pF
LO+ LO-
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Mixer Conversion Gain
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Mixer Input IP3
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Mixer Input/Output MatchInput Reflection Coefficient Output Reflection Coefficient
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Mixer Noise Figure
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Mixer Compliance
Specified Gain and Bandwidth
Reqt. Spec. Min Spec. Max Minimum Maximum Pass/Fail
DC Current - 25 mA - 12.4 mA Pass
Gain 7.5 dB 10.5 dB 9.3 dB 10.0 dB Pass
Noise Figure
- 11 dB 9.0 dB 10.7 dB Pass
Input IP3 -15 dBm - -12.95 - Pass
Input Return Loss
15.0 dB - 15.2 dB 26.4 Pass
Output Return Loss
15.0 dB - 31.5 dB 31.2 dB Pass
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Mixer Compliance - Temperature
Specified Gain and Bandwidth
Reqt. Spec. Min Spec. Max Minimum Maximum Pass/Fail
DC Current - 25 mA 11.47 mA 13.3 mA Pass
Gain 7.5 dB 10.5 dB 7.9 dB 11.1 dB Fail
Noise Figure
- 11 dB 7.1 dB 11.59 dB Fail
Input Return Loss
15.0 dB - 15.0 dB 31.7 Fail
Output Return Loss
15.0 dB - 31.2 dB 31.6 dB Pass
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Mixer Compliance - Bias
Specified Gain and Bandwidth
Reqt. Spec. Min Spec. Max Minimum Maximum Pass/Fail
DC Current - 25 mA 9.9 mA 15.1 mA Pass
Gain 7.5 dB 10.5 dB 8.2 dB 10.7 dB Fail
Noise Figure
- 11 dB 7.9 dB 10.9 dB Pass
Input Return Loss
15.0 dB - 13.7 dB 45.4 Fail
Output Return Loss
15.0 dB - 27.8 dB 40.2 dB Pass
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Mixer Layout
Vcc
Out -
Out +
LO - LO +-
Mixer In
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LNA DRC and LVS
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Mixer DRC and LVS
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Conclusion
Only LNA noise figure does not meet specification at nominal temperature and bias.
Design has been run through multiple simulations to test its robustness.