Modelling Differential Pairs For Low-Distortion Amplifier Design

The differential pair is one of the basic amplifying stages in amplifier design. Aiming at the the design of low-distortion amplifiers, a simple model for a differential pair is derived using the Volterra series. The parameters in this model correspond to the well-known small-signal parameters, furthermore the effect of the non-ideal tail-current source is made explicit in the model. The model gives insight in the way distortion is generated in a differential pair and it therefore allows the establishment of some simple design rules. Although being derived from a very simple model, the expressions give a good accordance with simulations.

Published in:
Proceedings of the 2003 IEEE International Symposium on Circuits and Systems, I, 261
Presented at:
ISCAS, Bankok, Thailand, 25-28 May 2003

 Record created 2004-12-03, last modified 2020-10-28

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