An Active-RC Reconfigurable Lowpass-Polyphase Tow-Thomas Biquad Filter


A novel active-RC biquad is presented which can be reconfigured as a polyphase filter for a low IF wireless receiver architecture, and as a lowpass filter for a zero IF wireless receiver architecture. A second order lowpass-polyphase reconfigurable filter is implemented to illustrate the technique. A 1.8 V fully differential operational amplifier in 0.18 um CMOS technology is used as the active element.

In Proceedings of Midwest Symposium on Circuits and Systems