Nonlinear Distortion in Feedback Amplifiers

Author

Desoer, Charles A.

Volume

Issue

fYear

1962

fDate

3/1/1962 12:00:00 AM

Firstpage

Lastpage

Abstract

Consider a feedback amplifier $F$ with a nonlinear output device $T_0$ and an open-loop amplifier A having the same gain and the same output device $T_0$ . If the gains of the forward amplifier $u$ and feedback network $\\beta$ are independent of frequency, it is well known that under the usual conditions the nonlinear distortion $\\zeta$ of $F$ due to $T_0$ is related to the nonlinear distortion $\\hat{\\zeta }$ of $A$ by $\\zeta = \\hat{\\zeta }/(1 + u \\beta )$ . In this paper conditions are determined under which a similar formula, namely $\\zeta = (1 + u \\beta )^{-1 \\ast }$ , applies when $u$ and $\\beta$ are strictly stable linear time-invariant amplifiers. The interpretation of the formula is the following: $\\zeta$ is the function of time which is output of an amplifier whose gain is $1/(1 + u \\beta )$ when $\\hat{\\zeta }$ is its input, and $\\hat{\\zeta }$ is the nonlinear distortion of the open-loop amplifier A.

Keywords

Equations; Feedback amplifiers; Frequency; Nonlinear distortion; Output feedback; Senior members; Stability; Voltage;

fLanguage

English

Journal_Title

Circuit Theory, IRE Transactions on

Publisher

ieee

ISSN

0096-2007

Type

jour

DOI

10.1109/TCT.1962.1086856

Filename

1086856

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1203654