Sixth-order programmable bandwidth bandpass sigma–delta modulator implemented with transmission lines

Abstract

An implementation of a sixth-order bandpass continuous time sigma–delta modulator using transmission lines is presented. A single tuning coefficient allows the exchange of resolution and bandwidth in this modulator, owing to the use of a two path transformation that exploits the similarity between transmission line modulators and discrete time modulators. The modulator tolerates two clock cycles of excess loop delay and a high clock jitter.