Phase distortionPhase distortion
that occurs when (a) the phase-frequency characteristic is not linear over the frequency range of interest, i.e.
, the phase shift
introduced by a circuit
or device is not directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic is not 0 or an integral multiple of 2π radians. Synonym phase-frequency distortion.
Source: from Federal Standard 1037C and from MIL-STD-188