Patent ID: 6515611
Filing Date: 2003-02-04
Classification: H03M

Abstract:
An analog-to-digital converter comprising:a sampling circuit; and a plurality of stages, a first one of the stages receiving a sampled analog input signal from the sampling circuit, each of at least a subset of the stages having associated therewith at least one amplifier circuit, the at least one amplifier circuit of a given one of the stages having at least one sampling component and at least one feedback component, each of the stages operating to generate outputs corresponding to one or more bits of a digital output signal representative of the analog input signal; a controller coupled to the at least one amplifier circuit and operative to control periodic swapping of the sampling component and the feedback component in accordance with a substantially random selection sequence in order to reduce gain error between one or more of the stages to thereby provide improved linearity for the analog-to-digital converter.