Design of Switched Capacitor Integrators using 90nm Technology

Abstract

The filters are important blocks in applications likeimage processing, communication, signal processing etc. Most of the filters are designed by using components like operationalamplifiers, resistors, capacitors etc. But, in present VLSI design this direct implementation of RC based filters cannot meet the non functional constraints like high speed, less area and low power etc. The RC based analog filters require precise values of components to maintain required frequency characteristics. Hence design of controllable, large value, uniform linear resistor in a less area is difficult in standard VLSI process. By replacing a resistor with a Switched Capacitor principles can solve most of these problems. The switched capacitor filters are designed by using a basic block called as switched capacitor integrators. The switched capacitor integrators and filters require only capacitor ratios to be precise to meet the required frequency characteristics and other parameters. The main aim of this work is to design switched capacitor based integrators for both parasitic sensitive and parasitic insensitive designs using Cadence Virtuoso full custom design flow and 90nm technology.