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A novel design technique for input differential pairs in single-ended operational amplifiers

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4 Author(s)
Morimoto, M. ; Dept. of Electr. Eng., Urmia Univ., Iran ; Hadidi, K. ; Futami, K. ; Matsumoto, T.

The input differential pair (IDP) is usually a major source of nonlinear distortion in any op-amp. This is specially true if the input signal has a large common-mode component, as is the case when an op-amp functions as a unity-gain buffer, or as a single-ended sample-and-hold (S/H) circuit. The authors have already reported a novel design technique which enhances linearity of IDPs. Based on that concept they have designed and fabricated two op-amps, which differ only in their IDPs. The direct measurement results, given here, show drastic improvement in THD of up to 15 dB

Published in:

Electronics, Circuits and Systems, 1998 IEEE International Conference on  (Volume:3 )

Date of Conference:

1998