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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