Download Chapter 6

6-1
Chapter Six
Basic FET Amplifiers
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-2
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.13
6-3
Common-source circuit with voltage divider biasing and coupling capacitor
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.14
6-4
Small-signal equivalent circuit, assuming coupling capacitor acts as a
short circuit
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.17
6-5
DC load line and transition point for NMOS circuit shown in Figure 6.16
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-6
Figure 6.19
Small-signal equivalent circuit of NMOS common-source amplifier
with source resistor
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.28
6-7
NMOS source-follower or common-drain amplifier
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.29
6-8
(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
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.34
6-9
Common-gate circuit
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-10
Figure 6.35
Small-signal equivalent circuit of common-gate amplifier
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.39
6-11
(a) NMOS amplifier with enhancement load device; (b) driver transistor
characteristics and enhancement load curve with transition point
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-12
Figure 6.39c
Voltage transfer characteristics of NMOS amplifier with
enhancement load device
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-13
Figure 6.43
(a) NMOS amplifier with depletion load device; (b) driver transistor characteristics
and depletion load curve, with transition points
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.43c
6-14
(c) voltage transfer characteristics
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.45
6-15
(a) CMOS common-source amplifier; (b) PMOS active load i-v characteristic, (c)
driver transistor characteristics with load curve, (d) voltage transfer characteristics
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
Figure 6.50
McGraw-Hill
NMOS cascode circuit
6-16
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.
6-17
Figure 6.52
Small-signal equivalent circuit of NMOS cascode
circuit
McGraw-Hill
Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.