Patent ID: 8981985
Filing Date: 2015-03-17
Classification: H03M

Abstract:
1. An analog-to-digital converter (ADC) for a multi-channel signal acquisition system, the ADC comprising: a sample-and-hold (S/H) circuit for each input channel, and operable to receive a respective analog input signal for each input channel; a digital-to-analog converter (DAC) common to all input channels; a comparator for each input channel, said comparator configured to receive an output signal from the S/H circuit of the respective input channel as a first input signal, and an output signal from the DAC as a second input signal, for generating a comparison result at each conversion cycle of the comparator; and a successive approximation register (SAR) common to all input channels and configured to generate, for each input channel, a digital output code based on the comparison results received from the respective comparator, wherein the S/H circuit and the DAC each comprises a capacitor array, so that the S/H circuit performs coarse conversion and the DAC performs fine conversion.