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InterviewSolution
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Why does the gain of an amplifier decrease at very low and very high frequencies? |
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Answer» The capacitive reactance of coupling and by pass capacitors is large at low frequencies. As this reactance with is in series with source resistance, the input signal is attenuated and the gain is less. At high frequencies, the reactance offered by junction capacitance of transistor and wiring capacitance is less. As this is in paralleled with output resistance, gain decreases with increase in frequency. |
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