Qualcomm Incorporated

Ajay Janardanan

Burt Lee Price

Yeshwant Nagaraj Kolla

Dhaval Shah

Dhaval Rajeshbhai Shah

A device includes an amplifier and calibration circuitry coupled to the amplifier. The calibration circuitry is configured to receive calibration values. The calibration circuitry is also configured to generate an output value in response to receiving a timing input.

Amplifier calibration

Automatically calibrating operational amplifier (op-amp) systems for mitigating effects of offset voltages are disclosed. In one aspect, an automatically calibrating op-amp system is provided that employs an analog calibration signal corresponding to a calibration mode to compensate an output voltage signal of an op-amp corresponding to an amplify mode. An automatic calibration circuit is included that employs a successive approximation register (SAR) controller configured to successively generate digital values based on the output voltage signal of the op-amp in response to a mode signal indicating the calibration mode. The automatic calibration circuit includes a digital-to-analog converter (DAC) configured to convert each successive digital value into the analog calibration signal in response to the mode signal indicating the calibration mode. The analog calibration signal is provided to an auxiliary differential input of the op-amp to compensate for the composite offset voltage in the amplify mode.

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Raleigh, NC, United States of America

Ajay Janardanan