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A process-insensitive high-performance NMOS operational amplifier

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3 Author(s)

A new high-performance NMOS operational amplifier is described which has been fabricated using a standard n-channel enhancement-depletion MOS process. A new input stage, employing common-mode feedback, is presented that reduces the circuit's sensitivity to process variations. The compensation of MOS cascade stages is examined and a simple improvement is shown to dramatically reduce the total compensation capacitance. It is shown that the high-performance of this design is maintained for a large variation in depletion device thresholds. Finally, an output stage is described with low quiescent power dissipation and improved driving capabilities.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:15 ,  Issue: 6 )