A Review on Continuous Time Sigma Delta Modulator

This paper presents review on system level design of continuous time sigma delta modulator. A continuous time approach offers high accuracy with respect to discrete time modulator. Unity gain frequency and power can be achieved by continuous time design. as the sigma delta modulators are mainly implemented as discrete time circuits , a continuous time approach provides significant advantages for realizing high accuracy analog to digital converters at signal bandwidths where technology consideration may impose significant constraints or problems which will affect the performance of system.