. A common-emitter amplifier is designed using the following topology to meet the design specifications, including (i) power budget = 25 mW (neglect the base current) under Vcc=5 V. (ii) small-signal gain = 40 dB. (iii) RB >> the input resistance of BJT. (a) Determine the Q-point of the BJT (Ic and VCE), RL, RB, and gm. (b) Plot the output signal (show both DC and AC levels) in the time domain (clearly indicates the maximum and minimum signal levels, and phase relation with the input signal). (c) If the Early effect of BJT is considered (VA = 25 V), plot the equivalent circuit model of the amplifier to determine the small-signal gain (dB). No need to consider the change of Ic and VCE due to Early effect to simplify the analysis.

. A common-emitter amplifier is designed using the following topology to meet the design specifications, including (i) power budget = 25 mW (neglect the base current) under Vcc=5 V. (ii) small-signal gain = 40 dB. (iii) RB >> the input resistance of BJT. (a) Determine the Q-point of the BJT (Ic and VCE), RL, RB, and gm. (b) Plot the output signal (show both DC and AC levels) in the time domain (clearly indicates the maximum and minimum signal levels, and phase relation with the input signal). (c) If the Early effect of BJT is considered (VA = 25 V), plot the equivalent circuit model of the amplifier to determine the small-signal gain (dB). No need to consider the change of Ic and VCE due to Early effect to simplify the analysis.

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

3. A common-emitter amplifier is designed using the following topology to meet the
design specifications, including (i) power budget = 25 mW (neglect the base current)
under Vcc=5 V. (ii) small-signal gain = 40 dB. (iii) RB >> the input resistance of BJT.
(a) Determine the Q-point of the BJT (Ic and VCE), R₁, RB, and gm.
(b) Plot the output signal (show both DC and AC levels) in the time domain (clearly
indicates the maximum and minimum signal levels, and phase relation with the input
signal).
(c) If the Early effect of BJT is considered (VA = 25 V), plot the equivalent circuit
model of the amplifier to determine the small-signal gain (dB). No need to consider
the change of Ic and VCE due to Early effect to simplify the analysis.
V.
in
RB
Vcc
RL
Vout
ß= 50
Vin
5 mv 1-AAAA -0.8 V
t

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