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What's the difference of Frequency Response?

What is frequency response of an amplifier?

  • is there a difference between the terms 'frequency response' and the 'frequency spectrum'?explain?

  • Answer:

    It is possible that the frequency response of an amplifier could be called it's frequency spectrum, but frequency spectrum is normally used to describe a signal generator, not an amplifier.

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An amplifier takes an input signal and increases that signal on the output. To an engineer, a perfect amplifier would take any input signal and raise it by the same amount on the output. But real amplifiers aren't perfect. It might take a signal at one frequency and raise it by 40dB, while a signal at another frequency might be raised only 28dB. You could chart this and show the effect the amplifier has for any given input frequency. The result is the frequency response of the amplifier. A spectrum could be generated by an amplifier, or by an unamplified signal, or by any number of things. It is a more general term.

Big Daddy

Frequency response of an amplifier is generally specified as the range between the lower and upper -3db points say 20-15000 hz or 87-108 mhz. Frequency spectrum is what part the frequency range is like audio, VHF, UHF. etc.

PAULH

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