A 2/sup nd/-order double-sampled /spl Delta//spl Sigma/ modulator with individual-level averaging

Delta-sigma modulators (/spl Delta//spl Sigma/Ms) can provide high-resolution, high-linearity analog-to-digital conversion without accurately matched passive components. With a second-order modulator, the signal-to-quantization-noise ratio increases with the oversampling ratio by 15 dB/octave. Therefore, maximizing the sample rate for a given signal bandwidth is important in high-resolution applications. To increase the sample rate by an amount close to the ideal maximum of 100%, individual-level averaging (ILA) can be used. ILA is a dynamic-element matching technique that has been shown to improve the linearity of /spl Delta//spl Sigma/Ms with multibit feedback. In this paper the use of ILA in a double-sampled /spl Delta//spl Sigma/M is described.