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Nonlinear Distortion in Feedback Amplifiers

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Consider a feedback amplifierFwith a nonlinear output deviceT_0and an open-loop amplifier A having the same gain and the same output deviceT_0. If the gains of the forward amplifieruand feedback networkbetaare independent of frequency, it is well known that under the usual conditions the nonlinear distortionzetaofFdue toT_0is related to the nonlinear distortionhat{zeta}ofAbyzeta = hat{zeta}/(1 + u beta). In this paper conditions are determined under which a similar formula, namelyzeta = (1 + u beta)^{-1 ast}, applies whenuandbetaare strictly stable linear time-invariant amplifiers. The interpretation of the formula is the following:zetais the function of time which is output of an amplifier whose gain is1/(1 + u beta)whenhat{zeta}is its input, andhat{zeta}is the nonlinear distortion of the open-loop amplifier A.

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Circuit Theory, IRE Transactions on  (Volume:9 ,  Issue: 1 )