For correct operation as an ac amplifier a npn BJT must be correctly DC biased to establish an appropriate Q-point, i.e a negative voltage VBC between the base and collector terminals and a positive voltage VBE between the base and emitter terminals. Figure 3.1 shows a circuit that can achieve this requirement. Explain the role of each resistive element in this circuit.

For correct operation as an ac amplifier a npn BJT must be correctly DC biased to establish an appropriate Q-point, i.e a negative voltage VBC between the base and collector terminals and a positive voltage VBE between the base and emitter terminals. Figure 3.1 shows a circuit that can achieve this requirement. Explain the role of each resistive element in this 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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Concept explainers

Differential amplifier

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

Question

b) For correct operation as an ac amplifier a npn BJT must be correctly DC
biased to establish an appropriate Q-point, i.e a negative voltage VBC
between the base and collector terminals and a positive voltage VBE
between the base and emitter terminals. Figure 3.1 shows a circuit that can
achieve this requirement. Explain the role of each resistive element in this
circuit.
Vin
RB1
Cin
iin
5
RB2
www
ww
20⁰
Rc
VB,
RE
+ Vcc
Vc Cout
VE
Figure 3.1
Vout
Ce
¡out

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