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.

**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 f_{1}& f_{2} are called lower
cut-off and upper cut-off frequencies.

Bandwidth
of the amplifier is defined as the difference between f_{2}& f_{1}.
Bandwidth of the amplifier = f_{2} - f_{1}

The
frequency f_{2} lies in high frequency region while frequency f_{1}
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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Electronic Circuits - Frequency Analysis of BJT and MOSFET Amplifiers : Definition of cut-off frequencies and bandwidth |

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