A low sensitivity switched-capacitor filter design with testability features

The very low sensitivity properties of a switched-capacitor structure based on a parallel connection of two allpass filters has been recently demonstrated by computer simulations. This paper presents the IC design of an SC video filter using this technique, and shows experimental results obtained in the laboratory to verify the validity of the proposed approach. A procedure for testing the transfer function of SC filters based on a parallel connection of allpass filter sections is presented.