(b) The 3-OpAmp Instrumentations Amplifier in Fig. Q.B2(a) is the front-end stage of an ECG amplifier, having the indicated values of resistors. Briefly explain the role of op- amps A1 and A2 and determine the voltage gain at this Stage-1: AStage-1 = [(Vo2- Vo1)/(V2 - V1) ]; assuming all resistors and op-amps are ideal and the resistors in the circuit have the exact values as indicated. Also, determine the voltage gain of the difference amplifier stage (Stage-2): Astage-2 = Vo / (Vo2- Vol), implemented by A3. %3D Then, specify the total differential voltage gain of the 3-OpAmp amplifier (cascaded Stage-1 and Stage-2): ATotal [Vo/(V2-V1)]. R1 = 120 k2 ; R2 = 10 kQ ; R3 = 20 k2 ; R4 = 160 k2 %3D A1 R4 Vor V1 R1 R3 R2 R1 A3 R3 Vo R4 Var A2 V. Fig O B2la) +

(b) The 3-OpAmp Instrumentations Amplifier in Fig. Q.B2(a) is the front-end stage of an ECG amplifier, having the indicated values of resistors. Briefly explain the role of op- amps A1 and A2 and determine the voltage gain at this Stage-1: AStage-1 = [(Vo2- Vo1)/(V2 - V1) ]; assuming all resistors and op-amps are ideal and the resistors in the circuit have the exact values as indicated. Also, determine the voltage gain of the difference amplifier stage (Stage-2): Astage-2 = Vo / (Vo2- Vol), implemented by A3. %3D Then, specify the total differential voltage gain of the 3-OpAmp amplifier (cascaded Stage-1 and Stage-2): ATotal [Vo/(V2-V1)]. R1 = 120 k2 ; R2 = 10 kQ ; R3 = 20 k2 ; R4 = 160 k2 %3D A1 R4 Vor V1 R1 R3 R2 R1 A3 R3 Vo R4 Var A2 V. Fig O B2la) +

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.

Question

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(b)
The 3-OpAmp Instrumentations Amplifier in Fig. Q.B2(a) is the front-end stage of an
ECG amplifier, having the indicated values of resistors. Briefly explain the role of op-
amps A1 and A2 and determine the voltage gain at this Stage-1:
Astage-1 = [(Vo2 - Vo1)/(V2 - V1) ]; assuming all resistors and op-amps are ideal and the
resistors in the circuit have the exact values as indicated. Also, determine the voltage
gain of the difference amplifier stage (Stage-2):
Astage-2 = Vo / (Vo2- Vol), implemented by A3.
Then, specify the total differential voltage gain of the 3-OpAmp amplifier (cascaded
Stage-1 and Stage-2): ATotal =[Vo/(V2-V1)].
R1 = 120 k2;
R2 = 10 k2 ;
R3 = 20 k2 ;
R4 = 160 kQ
A1
+
R4
R1
b.
R3
R2
R1
A3
R3
R4
Vo
Vor
A2
V.
Fig O B2(a)

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