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Microelectronic Circuits, Sixth Edition
Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Microelectronic Circuits, Sixth Edition
Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.8 Determining the output resistance of the MOS cascode amplifier.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.9 (a) A MOS cascode amplifier with an ideal current-source load; (b) equivalent circuit representation of the cascode output. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.10 Employing a cascode transistor Q3 to raise the output resistance of the current source Q4. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.11 A cascode amplifier with a cascode current-source load.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Microelectronic Circuits, Sixth Edition
Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Microelectronic Circuits, Sixth Edition
Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.14 The output resistance expression of the cascode can be used to find the output resistance of a source-degenerated common-source amplifier. Here, a useful interpretation of the result is that Rs increases the output resistance by the factor (1 + gmRs). Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.15 Double cascoding.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.16 The folded cascode.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.17 (a) A BJT cascode amplifier with an ideal current-source load; (b) small-signal equivalent-circuit representation of the output of the cascode amplifier; (c) the cascode amplifier with the output short-circuited to ground, and (d) equivalent circuit representation of (c). Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.18 Determining the output resistant Ro of the BJT cascode amplifier.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.19 A BJT cascode amplifier with a cascode current source.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Microelectronic Circuits, Sixth Edition
Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.21 BiCMOS cascodes.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7. 22 Circuit for a basic MOSFET constant-current source
Figure 7.22 Circuit for a basic MOSFET constant-current source. For proper operation, the output terminal, that is, the drain of Q2, must be connected to a circuit that ensures that Q2 operates in saturation. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.23 Basic MOSFET current mirror.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7. 24 Output characteristic of the current source in Fig. 7
Figure 7.24 Output characteristic of the current source in Fig and the current mirror of Fig for the case of Q2 matched to Q1. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.25 A current-steering circuit.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.26 Application of the constant currents I2 and I5 generated in the current-steering circuit of Fig Constant-current I2 is the bias current for the source follower Q6, and constant-current I5 is the load current for the common-source amplier Q7. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.27 (a) A current source; and (b) a current sink.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.28 The basic BJT current mirror.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.29 Analysis of the current mirror taking into account the finite of the BJTs.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.30 A simple BJT current source.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure 7.31 Generation of a number of constant currents of various magnitudes.
Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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Figure E7.19 Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc.
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