On the relationship between the CMRR or PSRR and the second harmonic distortion of differential input amplifiers | IEEE Journals & Magazine | IEEE Xplore

On the relationship between the CMRR or PSRR and the second harmonic distortion of differential input amplifiers


Abstract:

The results of a harmonic distortion analysis for a differential pair are presented, including the effects of mismatches and of the finite nonlinear common-mode rejection...Show More

Abstract:

The results of a harmonic distortion analysis for a differential pair are presented, including the effects of mismatches and of the finite nonlinear common-mode rejection ratio (CMRR) or power-supply rejection ratio (PSRR). Due to mismatches, a differential pair produces second-harmonic distortion. The presence of a finite common-mode gain limits the amount of feedback which can be usefully applied to suppress the harmonic distortion. When the common-mode gain is nonlinear, additional distortion is generated which is not suppressed by the feedback. When the amplifier has to drive a large load and when the supply line impedance is large, the finite PSRR causes similar effects.<>
Published in: IEEE Journal of Solid-State Circuits ( Volume: 24, Issue: 6, December 1989)
Page(s): 1740 - 1744
Date of Publication: 06 August 2002

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