Tuesday, 3 July 2012

Frequency response of an Amplifier

It is a high pass RC circuit. Frequency response indicates the variation of gain of an amplifier for different signal frequencies. Usually , an amplifier can't respond uniformly for all freqencies. Depending on the type of the amplifier the variation differs. In general, the performance of an amplifier remains uniform for mid frequencies. This is because coupling capacitors , bipass capacitors and junction capacitors have negligible effect at mid frequencies. At, low frequencies, the gain of the amplifier is limited by coupling capacitors and emitter by pass capacitors whereas at high frequencies, it is limitted by junction capacitance ot the transistor.
  In general, the low frequency response of an amplifier is governed by the high pass circuit.
Vi - input voltage
Vo - output voltage
C - capacitor
R - resistor

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