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A family of high-swing CMOS operational amplifiers

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5 Author(s)
Fiez, T.S. ; Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA ; Yang, H.C. ; Yang, J.J. ; Yu, C.
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A family of high-swing CMOS operational amplifiers has been developed to maximize the available dynamic range with low supply voltages. Complementary differential pairs are used to achieve an almost rail-to-rail input common-mode voltage range. High linearity is obtained by summing currents so that the small-signal differential-mode voltage gain is constant over the entire input common-mode range. With a 5.0-V power supply, the total harmonic distortion is typically only 1% in a unity-gain configuration with a 4.5-Vp-p signal. The measured DC offset voltages versus input common-mode range track between the conventional and high-swing versions. These measurements suggest that the commonly feared crossover distortion may not be a problem when the current summation high-swing topology is used. The measured step response characteristics were excellent and exhibited no signs of phase mismatch crossover distortion for high-frequency signals

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:24 ,  Issue: 6 )

Date of Publication:

Dec 1989

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