Operational Amplifier Configurations
CSE 577 Spring 2011
Operational Amplifier Configurations
Jaehyun Lim, Kyusun Choi
Department of Computer Science and Engineering The Pennsylvania State University
Mixed Signal Chip Design Lab
Ideal Op-Amp
? infinite voltage gain (A = , V-=V+ for finite VO)
? infinite input impedance (i- = i+ = 0)
? zero output impedance ? infinite bandwidth ? zero input offset
iV-
V+ i+
VO VO = A(V+ - V-)
Mixed Signal Chip Design Lab
Ideal Op-Amp
Inverting Amplifier Configuration
? current through R1 = current through Rf ( i-=i+= 0)
(Vin-V1) / R1 = (V--VO) / Rf
? and
Rf
V- = V+ = 0
Vin
R1 V-
VO
? VO = -(Rf / R1)Vin
Mixed Signal Chip Design Lab
Ideal Op-Amp
Non-Inverting Amplifier Configuration
? current through R1 = current through Rf ( i-=i+= 0)
(VO-V-) / Rf = V- / R1
? and
Vin VO
V-
V- = V+ = Vin
? VO = (1 + Rf / R1)Vin
Rf R1
Mixed Signal Chip Design Lab
Ideal Op-Amp
Voltage Follower (Unit Gain Buffer)
? unit-gain non-inverting amplifier ? VO = Vin
VO Vin
Mixed Signal Chip Design Lab
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