a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage Gj using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G¡G2.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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The transistors in the circuit below are identical and have B = 50 and VBE = 0.8 V in
forward bias. Ignore the Early effect and use Vr = 25 mV. The circuit consists of two
common-emitter amplifiers hooked together.
+ 4 V
4 V
4 V O
4 V O
Vout
100
Vsig
a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout
for a single stage.
b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate
the system gain of the first stage G1 using the input resistance of the second stage as the
load. Then calculate the system gain of the second stage G2 using the output resistance of
the first stage as the signal source resistance. The total gain is then G = G1G2.
2 k
Y 06
Y 06
Transcribed Image Text:The transistors in the circuit below are identical and have B = 50 and VBE = 0.8 V in forward bias. Ignore the Early effect and use Vr = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. + 4 V 4 V 4 V O 4 V O Vout 100 Vsig a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage G1 using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G1G2. 2 k Y 06 Y 06
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