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Distortion in CMOS operational amplifier circuits

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2 Author(s)
Wu, Bingxin ; Ministry of Posts and Telecommunications, Semiconductor Research Institute, Beijing, China ; Mavor, J.

The paper presents a nonlinear distortion analysis of three basic CMOS inverter circuits, namely PMOS load, constant-current source load and push-pull inverter, and compares their performance experimentally. The analysis is based on a small-signal MOSFET model including the channel-length modulation effect. The theoretical predictions are compared with measurements made on inverters, and incorporated in an operational amplifier, fabricated in an n-well CMOS polysilicon-gate 6 ¿m technology. The results confirm that the distortion depends on the signal level, quiescent bias, channel-length modulation effect, device geometries and processing parameters. The push-pull inverter has higher gain and lower distortion than the other output circuits. Only third-harmonic distortion exists in the operational amplifier using the push-pull inverter as its output stage.

Published in:

Solid-State and Electron Devices, IEE Proceedings I  (Volume:131 ,  Issue: 4 )