Power optimization and modeling of switched-capacitor integrators suitable for delta-sigma modulators

Abstract

In this thesis, the power dissipation aspects of the Switched-Capacitor (SC) integrators used in Delta-Sigma ( ) modulators are treated. Delta-Sigma modulators which employ oversampling are one of the most critical types of data converters and they are able to achieve high resolution at reasonably high conversion speeds. SC integrators are the key components of sampled-data Delta-Sigma modulators from the power consideration point of view. The structure of the SC integrator and the operational amplifier used determine the power consumption to a large extent. For this reason, firstly, the power optimization of the SC integrators is discussed via choosing the optimum SC integrator and operational amplifier design. Following that, a power model for SC integrators used in Delta-Sigma modulators is presented and its results are compared with the real implementations.