ee 359 electronic circuits march 3, 2005 0 multistage amplifiers two stage cmos opamp bipolar opamp...
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![Page 1: EE 359 Electronic Circuits March 3, 2005 0 Multistage Amplifiers Two Stage CMOS OpAMP Bipolar OpAmp SPICE](https://reader035.vdocuments.us/reader035/viewer/2022062409/56649f495503460f94c6b45e/html5/thumbnails/1.jpg)
March 3, 20051
EE 359 Electronic Circuits
Multistage AmplifiersMultistage Amplifiers
Two Stage CMOS OpAMP
Bipolar OpAmp
SPICE
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March 3, 20052
EE 359 Electronic Circuits
HW #5
• 7.10, 7.21, 7.71, 7.88
Due Tuesday
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March 3, 20053
EE 359 Electronic Circuits
Why Multistage?
• Practical transistor amplifiers consist of a number of stages connected in cascade.
• First stage typically high input impedance, & CMMR
• Middle stages amplification
• Last stage, low output impedance
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March 3, 20054
EE 359 Electronic Circuits
Two stage CMOS
Q8,Q5:current mirrors
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March 3, 20055
EE 359 Electronic Circuits
Differential Input
013
313 ||||
1
2rr
g
vgv O
m
idmg
Usually the leakage resistances are much larger than 1/g_m3
3
13 2 m
midg g
gvv
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March 3, 20056
EE 359 Electronic Circuits
Differential Gain
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March 3, 20057
EE 359 Electronic Circuits
Differential Input
22
2
23
41
234
idm
id
m
mmo
idmgmo
vg
v
g
ggi
vgvgi
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March 3, 20058
EE 359 Electronic Circuits
• vG2=0, vG1=vid
2/2
1
||
0
04020
omd
momid
d
ArgA
rrgRGv
vA
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March 3, 20059
EE 359 Electronic Circuits
Equivalent Circuit MOSFET Opamp
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March 3, 200510
EE 359 Electronic Circuits
Bias Circuit for Opamp
• Bias current independent of Supply Voltage and MOSFET threshold volage
• Q_12, Q_13 deliberately mismatched, Q_12 4x wider
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March 3, 200511
EE 359 Electronic Circuits
Bipolar Opamp
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March 3, 200512
EE 359 Electronic CircuitsBipolar Opamp
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March 3, 200513
EE 359 Electronic Circuits
Small Signal Analysis
• Input and output Impedances
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March 3, 200514
EE 359 Electronic Circuits
Gain of Second Stage
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March 3, 200515
EE 359 Electronic Circuits
Last stage
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March 3, 200516
EE 359 Electronic Circuits
Small Signal Model
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March 3, 200517
EE 359 Electronic CircuitsFrequency Response
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March 3, 200518
EE 359 Electronic Circuits Spice Simulation
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March 3, 200519
EE 359 Electronic Circuits
Opamp Transfer Function
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March 3, 200520
EE 359 Electronic Circuits
Differential Gain
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March 3, 200521
EE 359 Electronic Circuits
Frequency Response• Adjust frequency resonse by adding resistor in Q4
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March 3, 200522
EE 359 Electronic Circuits
Common Mode Rejection Ratio