1. Fig. 7.1 Bode plot for the typical magnitude term. The curve shown applies for the case of a zero. For a pole, the high-frequency asymptote should be drawn with a  6-dB/octave slope.

2. Fig. 7.2 Bode plots for Example 7.1.

3. Fig. 7.3 Bode plot of the typical phase term tan -1 (  /a) when a is negative.

4. Fig. 7.4 Phase plots for Example 7.2.

5. Fig. 7.10 The classical capacitively coupled common-source amplifier.

6. Fig. 7.11 The amplifier circuit of Fig. 7.10 prepared for finding the gain at low frequencies. The resistance 1/g m shown is the FET internal resistance between gate and source looking into the source (i.e., that of the T model.)

7. Fig. 7.12 The output equivalent circuit (at low frequencies) for the amplifier on Figs. 7.10 and 7.11.

8. Fig. 7.13 The classical common-emitter amplifier stage. (The nodes are numbered for the purposes of the SPICE simulation in Example 7.9.)

9. Fig. 7.14 Equivalent circuit for the amplifier of Fig. 7.13 in the low-frequency band.

10. Fig. 7.15 A MOSFET common-source amplifier (a), and a BJT common-emitter amplifier (b). here, V s and R s represent the Thévenin equivalent of the circuit at the input side, including the output circuit of the preceding amplifier stage (if any) and the bias network of the transistor Q (if any). Similarly, R L represents the total resistance between the drain (the collector) and signal ground. Although signal ground at the source (emitter) is shown established by a large capacitor, this is not necessary, and the circuits can be used to represent, for instance, the differential half-circuit of a differential pair.

11. Fig. 7.16 (a) Equivalent circuit for analyzing the high-frequency response of the amplifier circuit of Fig. 7.15(a). Note that the MOSFET is replaced with its high-frequency equivalent-circuit. (b) A slightly simplified version of (a) by combining R L and r o into a single resistance R’ L = R L //r o.

12. Fig.. 7.17 (a) Equivalent circuit for the analysis of the high-frequency response of the common-emitter amplifier of Fig. 7.15(b). Note that the BJT is replaced with its hybrid-  high-frequency equivalent circuit. (b) An equivalent but simpler version of the circuit in (a), where

13. Fig. 7.21 A common-base amplifier stage. For simplicity, the signal source is shown capacitively coupled. However, the high- frequency analysis applied directly to direct-coupled circuits.

14. Fig. 7.22 (a) Equivalent circuit of the common-base amplifier in Fig. 7.21; (b) simplified version of the circuit in (a).

15. Fig. 7.24 High-frequency analysis of the cascode amplifier in Fig. 7.23. Note that to simplify the analysis, r x2 and r o2 are not included.

16. Fig. 7.25 High-frequency analysis of the emitter follower.

17. Fig. 7.28 Equivalent circuits for the determination of the high-frequency response of the amplifier in Fig. 7.27.

18. Fig. 7.31 (a) Equivalent half-circuit of the differential amplifier with emitter resistance R E. (b) Equivalent circuit of the half-circuit in (a). (c) Circuit for determining the resistance R  seen by C . (d) Circuit for determining the resistance R  seen by C .

19. Fig. 7.32 The equivalent common-mode half-circuit.

20. Fig. 7.33 Variation of (a) common-mode gain, (b) differential gain, and (c) common-mode rejection ratio with frequency.