Patent ID: 7286075
Filing Date: 2007-10-23
Classification: H03M

Abstract:
1. An analog to digital converter for converting an analog input signal to a digital output signal, comprising a first group of capacitors for participation in a successive approximation conversion, each capacitor having at least one associated switch for controllably connecting a terminal of the capacitor to a first reference voltage or to a second reference voltage; a second group of capacitors for applying a dither and having switches for selectively connecting the capacitors to the first reference voltage or the second reference voltage and a sequence generator for generating a sequence of bits, wherein during sampling of the analog input signal onto at least some of the capacitors of the first group of capacitors or during conversion of a sample of the analog input signal an output of the sequence generator is supplied to the switches of the second group of capacitors to control whether a given capacitor within the second group is connected by its associated switch to the first reference voltage or to the second reference voltage, so as to apply a dither to said conversion.