1. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.23 The CS circuit at s = s Z. The output voltage V o = 0, enabling us to determine s Z from a node equation at D.

2. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.24 (a) High-frequency equivalent circuit of the common-emitter amplifier. (b) Equivalent circuit obtained after Thévenin theorem has been employed to simplify the resistive circuit at the input.

3. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.25 (a) High-frequency equivalent circuit of a CS amplifier fed with a signal source having a very low (effectively zero) resistance. (b) The circuit with V sig reduced to zero. (continued)

4. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.25 (continued) (c) Bode plot for the gain of the circuit in (a).

5. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.26 (a) The common-gate amplifier with the transistor internal capacitances shown. A load capacitance C L is also included. (b) Equivalent circuit for the case in which r o is neglected.

6. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.27 Circuits for determining R gs and R gd.

7. Microelectronic Circuits, Sixth Edition Sedra/Smith Copyright © 2010 by Oxford University Press, Inc. Figure 9.28 The CG amplifier circuit at midband.