Amplification - Frequency response

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As with other components in the audio world, an amplifier also is given a frequency response through which we can evaluate its quality. What we want from an amplifier is that it returns the signal band that we send at the input unalterered. In other words, we want a flat response on the entire frequency band we're interested in. For example, a hi-fi amplifier works with all the audible frequencies, so we'd need the response's amplitude to be flat[19 ] from 20 Hz to 20 KHz, and also to have a constant phase response:

Amplification - Amplitude and phase response of an amplifier

Amplitude and phase response of an amplifier

The above diagram is purely theoretical. A real amplifier never has such a perfect response!

[19 ] In actual fact, we can accept amplitude variations of 1 or 2 dB in relation to the average value to consider the response to be constant.


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