Slope distortion is significant when the time derivative of the output voltage of a feedback amplifier approaches the amplifier's slew-rate limit. Slope distortion prior to slew-rate limiting is reduced by local feedback at the first stage; additional benefits of local feedback are increases in the maximum step input and in the slew-rate limit itslef (if the amplifier is correctly compensated). The transfer characteristics of practical first-stage designs (with the degree of local feedback as a parameter) are compared.

Author: Garde, Peter
Affiliation: School of Electrical Engineering, University of New South Wales, Sydney, N.S.W., Australia
JAES Volume 26 Issue 9 pp. 602-608; September 1978
Publication Date: September 1, 1978

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