11-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Eleven Differential and Multistage Amplifiers

11-2 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 11.2 Basic BJT differential-pair configuration

11-3 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 11.3 Basic diff-amp with applied common-mode voltage and (b) basic diff-amp with applied differential- mode voltage

11-4 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 11.7 (a) Equivalent ac circuit, diff-amp with differential-mode input signal and two-sided output voltage and (b) ac equivalent circuit with one- sided output

11-5 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 11.8 Small-signal equivalent circuit, bipolar differential amplifier

11-6 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure (a) Equivalent ac circuit, diff-amp with applied sinusoidal differential-mode input signal, and resulting signal current directions and (b) differential-mode half-circuits

11-7 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure (a) Equivalent ac circuit of diff-amp with common-mode input signal, and resulting signal current directions and (b) common-mode half circuits

11-8 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure AC equivalent circuit, MOSFET differential amplifier

11-9 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure Small-signal equivalent circuit, MOSFET differential amplifier

11-10 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure MOSFET cascode current source

11-11 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure BJT differential amplifier with active load

11-12 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure BJT differential amplifier with three-transistor active load, showing the signal currents

11-13 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure (a) Small-signal equivalent circuit BJT differential amplifier with active load and (b) rearrangement of small-signal equivalent circuit

11-14 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure The ac equivalent circuit, MOSFET differential amplifier with active load

11-15 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure (a) Small-signal equivalent circuit, MOSFET differential amplifier with active load and (b) rearranged small-signal equivalent circuit

11-16 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure A MOSFET cascode diff-amp with a cascode diff-amp

11-17 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure BJT diff-amp with three-transistor active load, Darlington pair gain stage, and simple emitter-follower output stage