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Which parasitic capacitors don’t affect the frequency response of the C.C. stage of the B.J.T.?

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Which parasitic capacitors don’t affect the frequency response of the C.C. stage of the B.J.T.?

(a) Ccs

(b) Ccs and Cb

(c) Cb

(d) Ccs and Cµ

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I would like to ask this question from Effect of Various Capacitors on Frequency Response in division Transistor Frequency Response of Analog Circuits

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Correct choice is (a) Ccs

Explanation: In the follower stage, the load is present at the emitter. The parasitic capacitors present between the collector and the substrate i.e. Cµ gets deactivated. This is observed from the small signal analysis where both the terminals of this capacitor get shorted to A.C. ground.

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