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10-1

Chapter Ten

Integrated Circuit Biasing and Active Loads

10-2Figure 10.2(a) Basic two-transistor current source; (b) two-transistor current source with reference resistor R1

Page 3: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-3Figure 10.5Basic-three-transistor current source

Page 4: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-4Figure 10.6(a) Two-transistor current mirror; (b) three-transistor current mirror; (c) variation in bias currents with a change in ß

Page 5: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-5Figure 10.7

(a) Bipolar cascode current mirror; (b) small-signal equivalent circuit

Page 6: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-6Figure 10.9Widlar current source

Page 7: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-7Figure 10.10(a) Small-signal equivalent circuit for determining output resistance of Widlar current source, (b) simplified equivalent circuit for determining output resistance, and (c) equivalent circuit after a Norton transformation

Page 8: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-8Figure 10.17MOSFET current source

Page 9: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-9Figure 10.19MOSFET cascode current mirror

Page 10: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-10Figure 10.20Equivalent circuits of the MOSFET cascode current mirror for determining output resistance

Page 11: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-11Figure 10.23Bias-independent MOSFET current mirror

Page 12: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-12Figure 10.28Bipolar common-emitter circuit

Page 13: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-13Figure 10.30Voltage transfer characteristics of bipolar circuit with active load

Page 14: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-14Figure 10.37

(a) Simple BJT amplifier with active load and load resistance and(b) small-signal equivalent circuit

Page 15: 10-1 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Chapter Ten Integrated Circuit Biasing and Active Loads

10-15Figure 10.39(a) Simple MOSFET amplifier with active load and load resistance and(b) small-signal equivalent circuit

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