Western Digital Corporation

Mike Spaur

Timothy G O'Shaughnessy

A stability-compensated, integrated-circuit operational amplifier has an open-loop gain versus frequency characteristic which provides stable and accurate closed-loop operation in numerous overall circuits including a CMOS circuit for producing a precision current as a reference to a digital-to-analog converter. The operational amplifier comprises an inverting node and a non-inverting node, and CMOS circuitry defining two differential amplifiers. Each differential amplifier is connected to the inverting node and the non-inverting node. The first differential amplifier has an output node, and produces on the output node an output potential that defines an output signal having a magnitude that is a function of the magnitude of the difference between a first potential at the inverting node and a second potential at the non-inverting node. The second differential amplifier is also connected to the inverting node and the non-inverting node. The second differential amplifier produces a compensation signal. The operational amplifier further includes capacitive circuitry for coupling the compensation signal to the non-inverting node.

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Laguna Niguel, CA, United States of America

Mike Spaur