Chapter 7 Frequency Response2

# B the effect of c c 1 is determined with c e and c c

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(b) the effect of C C 1 is determined with C E and C C 2 assumed to be acting as perfect short circuits;

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(c) the effect of CE is determined with CC 1 and CC 2 assumed to be acting as perfect short circuits
(d) the effect of CC 2 is determined with CC 1 and CE assumed to be acting as perfect short circuits;

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(e) sketch of the low-frequency gain under the assumptions that CC 1, CE , and CC 2 do not interact and that their break (or pole) frequencies are widely separated.
Homework: April 15th, 2008 7.29; 7.35; 7.39

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7.4 High-frequency response of the CS and CE amplifiers Miller’s theorem. Analysis of the high frequency response. Ø Using Miller’s theorem. Ø Using open-circuit time constants.
High-Frequency Equivalent-Circuit Mo del of the CS Amplifier 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 RL and ro into a single resistance R’L = RL//ro .

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High-Frequency Equivalent-Circuit Model of the CE Amplifier 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), ( 29 o L L x s s s s s s r R R r r R R r r R r V V // // ' ' ' = + = + + = π π π
Miller’s Theorem Impedance Z can be replaced by two impedances: Z1 connected between node 1 and ground Z2 connected between node 2 and ground

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Miller’s Theorem The miller equivalent circuit is valid as lon g as the conditions that existed in the netw ork when K was determined are not chang ed. Miller theorem can be used to determining the input impedance and the gain of an a mplifier; it cannot be applied to determine t he output impedance.
Analysis Using Miller’s Theorem Ø Approximate equivalent circuit obtained by applying Miller’s theorem.

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• Fall '10
• ChengJianping
• Transistor, Electronic amplifier, Cascode, Common source, Common emitter, CE ampliﬁer

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