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Module 3: Part 2

Module 3: Part 2. Basic FET Amplifiers. Learning Objectives. After studying this module, the reader should have the ability to: Explain graphically the amplification process in a simple MOSFET amplifier circuit.

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Module 3: Part 2

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  1. Module 3: Part 2 Basic FET Amplifiers

  2. Learning Objectives After studying this module, the reader should have the ability to: • Explain graphically the amplification process in a simple MOSFET amplifier circuit. • Describe the small-signal equivalent circuit of the MOSFET and to determine the values of the small-signal parameters. • Apply the small-signal equivalent circuit to various MOSFET amplifier circuits to obtain the time-varying circuit characteristics. • Characterize the small-signal voltage gain and output resistance of a common-source amplifier. • Characterize the small-signal voltage gain and output resistance of a source-follower amplifier. • Characterize the small-signal voltage gain and output resistance of a common-gate amplifier. • Describe the operation of an NMOS amplifier with either an enhancement load, a depletion load, or a PMOS load. • Apply the MOSFET small-signal equivalent circuit in the analysis of multistage amplifier circuits. • Describe the operation and analyze basis JFET amplifier circuits.

  3. Common-source circuit with voltage divider biasing and coupling capacitor

  4. Small-signal equivalent circuit, assuming coupling capacitor acts as a short circuit

  5. DC load line and transition point for NMOS circuit shown in Figure 6.16

  6. Small-signal equivalent circuit of NMOS common-source amplifier with source resistor

  7. NMOS source-follower or common-drain amplifier

  8. (a) Small-signal equivalent circuit of NMOS source-follower and (b) small-signal equivalent circuit of NMOS source-follower with all signal grounds at a common point

  9. Common-gate circuit

  10. Small-signal equivalent circuit of common-gate amplifier

  11. (a) NMOS amplifier with enhancement load device; (b) driver transistor characteristics and enhancement load curve with transition point

  12. Voltage transfer characteristics of NMOS amplifier with enhancement load device

  13. (a) NMOS amplifier with depletion load device; (b) driver transistor characteristics and depletion load curve, with transition points

  14. (c) voltage transfer characteristics

  15. (a) CMOS common-source amplifier; (b) PMOS active load i-v characteristic, (c) driver transistor characteristics with load curve, (d) voltage transfer characteristics

  16. NMOS cascode circuit

  17. Small-signal equivalent circuit of NMOS cascode circuit

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