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EECS425 β Winter 2016 Group B
Final Specs. and Layout
2
Parameter Values
π ππππππ
π ππππππ
π ππππ
π π. ππ΅/π
π ~πππ π―π
Sensing π΅ ππ & ππ
Actuating π΅ π
πΆ πΒ°
ππ© πππππ
ππππππ πππ
EECS425 β Winter 2016 Group B
4
Fabricated Test Die
Ring Oscillator
Op-amp
Op-amp
Op
-am
p
Res
Cap
Op-amp
(Separate)
Cap
06/04/2014
Close-loop Amplification
Feedback Resistor (Ξ©)
Close-loop Gain
Mesured Gain
100 1 1.0
1K 10 9.2
-5 -2.5 0 2.5 5
x 10-3
-1
-0.5
0
0.5
1
Time (sec)V
olt
ag
e (
V)
Vin
Vout
5K 50 2.7
EECS425 β Winter 2016 Group B
Open Loop Gains
7
β’ Gain is operating condition
dependent
β’ πΊ1 Γ πΊ2 β πΊπ‘ππ‘ππ
β’ 2nd stage is a load of 1st
stage interference
Experimental setting β’ Gains of stage measured on a
βseparatedβ op-amp
β’ Operating condition varied for
largest amplifications
1st Stage Gain 2nd Stage Gain Open Loop Gain
06/04/2014
Unity Gain Bandwidth
102
103
104
105
106
107
-20
-10
0
10
20
Frequency (Hz)
Gain
(d
b)
102
103
104
105
106
107
-300
-200
-100
0
100
Frequency (Hz)
Ph
ase
(d
eg
)
Simulated Value Measured Value
9.8MHz 1.15MHz
06/04/2014
Slew Rate
0 1 2 3
x 10-5
-1
-0.5
0
0.5
1
Time (sec)
Vo
ltag
e (
V)
Vin
Vout
0 1 2 3
x 10-5
-1
-0.5
0
0.5
1
Time (sec)
Vo
ltag
e (
V)
0 1 2 3
x 10-5
-1
-0.5
0
0.5
1
Time (sec)
Volt
age (
V)
Vin
Vout
0 1 2 3
x 10-5
-1
-0.5
0
0.5
1
Time (sec)V
olt
age (
V)
Simulated Value Measured Value
Rise Edge 24.62 V/us 91.50 V/ms
Fall Edge -12.62 V/us 66.35 V/ms
EECS425 β Winter 2016 Group B
Peak detector
10 -4 -3 -2 -1 0 1 2 3 4
x 10-3
-2
-1
0
1
2
Time (sec)
Volt
age (
V)
Vin
Vpeak,exp
Vpeak,sim
Experiment setting
β’ DC input carried by a AC signal
β’ ππππππππ = 1 kHz
β’ ππππππ = 200 Hz (externally provided)
Result
β’ Able to detect peak w/ ππππππ
β’ Fluctuation due to non-ideal op-amp output
0.8 1 1.2 1.4 1.6
0.8
1
1.2
1.4
1.6
Vin,pp
(V)
Vp
eak (
V)
Sim
Exp
EECS425 β Winter 2016 Group B
Ring oscillator
11
3 4 5 6 70.8
1
1.2
1.4
1.6
1.8
Bias voltage (V)R
ing
osc
illa
tor
ou
tpu
t fr
eq
. (M
Hz)
-5 0 5
x 10-6
-0.4
-0.3
-0.2
-0.1
0
Time (sec)
Volt
age (
V)
πππππ =1
2πππππππ¦ )22(οΌ0tth BSBB VVV