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US 5,006,817 AGranted
Rail-to-rail CMOS operational amplifier
AssigneeSierra Semiconductor Corporation
InventorJoseph N. Babanezhad
Life of this patent
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Abstract
A CMOS operational amplifier comprises an output gain stage including output transistors coupled between the rails so that for a given amount of current, the output transistors have rail-to-rail gate-to-source voltages. The output transistors can be made smaller in size with the output stage being capable of driving a small resistive load with minimal signal distortion.
Claims12
A CMOS operational amplifier comprising:
- a source of differential input signals;
- a differential-output differential-input folded cascode input stage comprising a differential amplifier coupled to said source for providing a differential-output signal;
- a differential input single-ended-output output stage comprising an output biasing coupled to said input stage for determining the common-mode voltage of the differential-output signal of said input stage;
- and
- a common-mode feedback circuit coupled between said input stage and said output biasing section.
2 more elements
Dependencies are inferred from the claim text.