The transistors in the circuit below are identical and have = 50 and VBE = 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. Vsig 100 90 k Mo 500 +4V 4 V 90 k 500 +4 V ww - Vout 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.

The transistors in the circuit below are identical and have = 50 and VBE = 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. Vsig 100 90 k Mo 500 +4V 4 V 90 k 500 +4 V ww - Vout 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.

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

Differential amplifier

There are two amplifying stages with common degeneration in a differential amplifier.

Question

The transistors in the circuit below are identical and have = 50 and VBE = 0.8 V in
forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two
common-emitter amplifiers hooked together.
Vsig
100
90 k
Mo
500
+4V
4 V
90 k
500
+4 V
ww
- Vout
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.

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