Phase response

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Phase response is the relationship between the phase of a sinusoidal input and the output signal passing through any device which accepts input and produces an output signal such as an amplifier or a filter.

Amplifiers, filters and other devices are often categorized by their amplitude and/or phase response. The amplitude response is the ratio of output amplitude to input, usually a function of the frequency. Similarly, phase response is the phase of the output with the input as reference. The input is defined as zero phase. A phase response is not limited to lying between 0° and 360°, as phase can accumulate to any amount of time.

See also

• Group delay and phase delay

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