AN ANALOG-TO-DIGITAL CONVERTER FOR A MULTI-CHANNEL SIGNAL ACQUISITION SYSTEM

摘要

An analog-to-digital converter (ADC) for a multi-channel signal acquisition system, a signal acquisition system, a method of generating a digital output code from an analog input signal received at an input channel of a plurality of input channels, and a method of converting a plurality of analog input signals to a digital output signal are provided. The ADC comprises 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.