Given in Figure la is an operational amplifier used as a summing amplifier that accepts three inputs: v1, v2, and V3. The op amp has a gain of av, input resistance of rin, and output resistance of rout. The equivalent circuit of the op amp is shown in Figure 1b. R1 RF R2 Tout Vout v2 R3 oVout Vdiff I)avvdiff T'in v3 V-o Input Network Feedback Amplifier (a) Summing Amplifier (b) Equivalent Circuit of the Op Amp Figure 1: Summing Amplifier and Equivalent Op Amp Circuit
Given in Figure la is an operational amplifier used as a summing amplifier that accepts three inputs: v1, v2, and V3. The op amp has a gain of av, input resistance of rin, and output resistance of rout. The equivalent circuit of the op amp is shown in Figure 1b. R1 RF R2 Tout Vout v2 R3 oVout Vdiff I)avvdiff T'in v3 V-o Input Network Feedback Amplifier (a) Summing Amplifier (b) Equivalent Circuit of the Op Amp Figure 1: Summing Amplifier and Equivalent Op Amp Circuit
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Find the expression for the open loop gain Rm (=Output voltage/Input current). Get the expression for Ro,cl (closed loop output resistance).
Transcribed Image Text:Given in Figure la is an operational amplifier used as a summing amplifier that accepts three inputs: v1, v2, and
V3. The op amp has a gain of av, input resistance of rin, and output resistance of rout. The equivalent circuit of
the op amp is shown in Figure 1b.
R1
RF
Tout
R2
V+ o
o Vout
V2
-o Vout
R3
Vdiff
| AyVdiff
rin
V3
V-o
Input Network
Feedback Amplifier
(a) Summing Amplifier
(b) Equivalent Circuit of the Op Amp
Figure 1: Summing Amplifier and Equivalent Op Amp Circuit
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