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A CE amplifier when bypassed with a capacitor at the emitter resistance has

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A CE amplifier when bypassed with a capacitor at the emitter resistance has

(a) increased input resistance and increased voltage gain

(b) increased input resistance and decreased voltage gain

(c) decreased input resistance and increased voltage gain

(d) decreased input resistance and decreased voltage gain

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Enquiry is from The AC Analysis of a Small-Signal Low-Frequency Common Emitter Transistor. topic in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Right choice is (c) decreased input resistance and increased voltage gain

Explanation: When a transistor is bypassed with a capacitor, it short circuits in the small signal analysis of transistor and the resistor too shorts. The input resistance becomes RI=hie. The value of the input resistance is decreased and the gain now will be increasing.

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