University of California

Gerry Taylor

Ian Galton

A continuous-time delta-sigma modulator for analog-to-digital conversion includes a pair of pseudo-differential signal paths including a pair of pseudo-differential signal paths including current-controlled ring oscillators as the load of open-loop common-source amplifiers that are driven by an analog input signal. The signal path produces digital values by sampling the open-loop current-controlled ring oscillators. A calibration circuit measures nonlinear distortion coefficients in a replica of the signal path. A nonlinearity corrector corrects digital values based upon the nonlinear distortion coefficients.

Mostly-digital open-loop ring oscillator delta-sigma ADC and methods for conversion

An embodiment provides a continuous-time delta-sigma modulator for analog-to-digital conversion. The modulator includes a signal path generating including a ring voltage controlled oscillator driven by an analog input signal. The signal path produces digital values by sampling the ring voltage controlled oscillator. A calibration circuit measures nonlinear distortion coefficients in a replica of the signal path. A nonlinearity corrector corrects the digital values based upon determined nonlinear distortion coefficients. Preferred embodiment ADC &#x394;&#x3a3; modulators do not require any analog integrators, feedback DACs, comparators, or reference voltages, and do not require a low jitter clock.

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Laguna Niguel, CA, United States of America

Gerry Taylor