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Chapter 12 Field-Effect TransistorsPowerPoint Presentation

Chapter 12 Field-Effect Transistors

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Chapter 12Field-Effect Transistors

Chapter 12Field-Effect Transistors

- Understand MOSFET operation.
- 2. Analyze basic FET amplifiers using the load-line technique.
- 3. Analyze bias circuits.

4. Use small-signal equivalent circuits to analyze

FET amplifiers.

5. Compute the performance parameters of several

FET amplifier configurations.

6. Select a FET amplifier configuration that is

appropriate for a given application.

7. Understand the basic operation of CMOS logic

gates.

Amplifier Analysis it.

Amplifier analysis has two steps:

1. Determine the Q point.

2. Use a small-signal equivalent circuit to determine impedances and gains.

The Small-Signal Equivalent Circuit it.

In small-signal midband analysis of FET amplifiers, the coupling capacitors, bypass capacitors, and dc voltage sources are replaced by short circuits. The FET is replaced with its small-signal equivalent circuit. Then, we write circuit equations and derive useful expressions for gains, input impedance, and output impedance.

Voltage Gain it.

Input Resistance it.

Output Resistance it.

To find the output resistance of an amplifier, we disconnect the load, replace the signal source by its internal resistance, and then find the resistance looking into the output terminals.

SOURCE FOLLOWERS it.

Voltage Gain it.

Input Resistance it.

Source-Follower Characteristics it.

The source follower has voltage gain slightly less than unity, high input impedance, and low output impedance. Current gain and power gain can be larger than unity.

CMOS Inverter it.

CMOS NAND Gate it.

CMOS NOR Gate it.

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