Novel filters for sigma-delta A/D conversion

Abstract

Oversampled data conversion techniques based on sigma-delta modulation lias an increasing popularity. The main reason behind this fact is the recent developments in VLSI technologies especially in CMOS VLSI. These kind of converters have several advantages such as robustness, no trimming, no error correction, good noise performcince. etc. This thesis presents .several kinds of high resolution converter structures. It states advantages of second order sigma-delta conversion technique. hollowing this discussion, a new implementation of the second order sigma-delta modulation with a single feedback loop is introduced which can be imiilemented in a smaller area.. The performance, of the system is estimated with some digital decimation filters, one of which is an extended version of standard .smA filter that can be integrated in a chip with a small die size.