Definition of cut-off frequencies
and bandwidth:
The range
of frequencies can be specified over which the gain does not deviate more than
70.7% of the maximum gain at some reference mid-frequency.
From
above figure, the frequencies f1& f2 are called lower
cut-off and upper cut-off frequencies.
Bandwidth
of the amplifier is defined as the difference between f2& f1.
Bandwidth of the amplifier = f2 - f1
The
frequency f2 lies in high frequency region while frequency f1
lies in low frequency region. These two frequencies are also called as
half-power frequencies since gain or output voltage drops to 70.7% of maximum
value and this represents a power level of one half the power at the reference
frequency in mid-frequency region.
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