Lecture Notes - Chapter 8
Transistor Amplifiers
(These Lecture Notes are for courses using the book
the Complete Electronics Self-Teaching Guide with Projects.
Instructors of courses using that text are permitted to use these
Lecture Notes as-is or adapt
them for their use).
- Working with Transistor Amplifiers
- Discuss the relationship between IC and VC
(figure 8.2).
- Introduce the terms: linear region
- Operating a transistor in the linear region results in
an output signal that is free of distortion.
- Discuss the amplification of an AC signal in a transistor
circuit (figure 8.4).
- Review the equation to calculate the voltage gain (AV).
- Discuss the limitations of the simple amplifier circuit
shown in figure 8.2.
- A Stable Amplifier
- Discuss the addition of R2 and RE to
the amplifier circuit that result in the circuit shown in figure
8.5.
- R1 is added to ensure the stability of the DC
bias point.
- RE is added to ensure the stability of AC
gain.
- Discuss the equation for the AC voltage gain for this
circuit.
- Biasing
- Discuss the calculations to determine R1, R2
and RE for the circuit shown in figure 8.8.
- Project 8.1: The Transistor Amplifier
- Review the circuit diagram (figure 8.12).
- Review the test setup (figure 8.15).
- Emitter Bypass Capacitor
- Discuss the addition of an emitter bypass capacitor to a
transistor amplifier circuit (figure 8.18).
- Discuss the different paths taken by DC vs. AC signals when
an emitter bypass capacitor is used (figure 8.19).
- Review the equation used to calculate the AC voltage gain
for an amplifier using an emitter bypass capacitor.
- Discuss the change in voltage amplification that occurs when
an emitter bypass capacitor is used.
- The Emitter Follower
- Review the emitter follower circuit (figure 8.23).
- Discuss the calculations to determine R1 and R2.
- Discuss the voltage gain of the emitter follower circuit.
- Discuss the difference between the input resistance and
output resistance of an emitter follower circuit.
- Discuss the advantages of using the emitter follower circuit
when driving a load (figure 8.25).
- Analyzing an Amplifier
- Discuss the equations used to calculate VB, IC,
VC and AV for a amplifier circuit (figure
8.27).
- Discuss the difference in AV for the circuit with
and without an emitter bypass capacitor.
- The JFET as an Amplifier
- Review the transfer curve for a JFET (figure 8.31).
- Discuss the equation to calculate the drain current.
- Review the JFET common source amplifier circuit (figure
8.32).
- Introduce the term: transconductance (gm).
- Discuss the equation used to calculate the AC voltage gain,
using gm.
- Discuss the calculations used to determine RD and
RS for the circuit shown in figure 8.33.
- The Operational Amplifier
- Discuss the advantages of using operational amplifiers.
- Review the op-amp circuit shown in Figure 8.35.
- Discuss the equation used to calculate the AC voltage gain
for this circuit.
- Project 8.2: The Operational Amplifier
- Discuss the project objective.
- Review the circuit diagram (figure 8.38).
- Review the test setup (figure 8.40).
This page includes material extracted, by
permission of the publisher, Wiley Publishing, from Complete
Electronics Self-Teaching Guide with Projects, ISBN: 9781118217320.
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