VERY HIGH DYNAMIC-RANGE SWITCHED CAPACITOR ADC WITH LARGE INPUT IMPEDANCE FOR APPLICATIONS TOLERATING INCREASED DISTORTION AND NOISE AT LARGE INPUT SIGNAL LEVELS

摘要

A modulator responds to input swings by providing a feedback voltage via a feedback path to compromise an increase in noise and distortion power by increasing signal power at signal levels exceeding a predetermined threshold. A digital-to-analog converter (DAC) generates a feedback voltage with a resistor string biased by a predetermined current, and is switched as a function of an input value to mitigate voltage swing at a summing node.