The three frequency ranges of operation

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You can see the typical frequency response of an amplifier.

The graph can be seen to consist of three ranges:

(i) a low-frequency range in which the gain increases with increasing

frequency

(ii) a mid-frequency range over which the gain is relatively constant

(iii) a high frequency range over which the gain falls with increasing

frequency.

For simplicity, let's consider the mid-frequency range first.