Phase intermodulation (PIM) in audio amplifiers, particularly that which may arise from the use of negative feedback, is considered. Coherent SMPTE-IM instrumentation capable of resolving two nanoseconds of equivalent time dispersion and measurement results from several different real amplifiers are presented. The results show that PIM is not a problem in contemporary amplifiers and that negative feedback reduces total PIM in most cases.

Author: Cordell, Robert R.
Affiliation: Bell Laboratories, Holmdel, NJ
AES Convention: 70 (October 1981) Paper Number: 1842
Publication Date: October 1, 1981
Subject: Signal Processing

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