A Continuous-Time Digital IIR Filter with Signal-Derived Timing, Agile Power Dissipation and Synchronous Output

Yu Chen, Xiaoyang Zhang, Yong Lian, Rajit Manohar, and Yannis Tsividis

We present the first continuous-time digital IIR filter with power consumption tracking the input activity and varying by over 50x, resulting in a FoM varying from 33fJ to 0.6fJ. Only two tapped delays are used for a sixth-order filter. The 1.2V 65nm CMOS prototype achieves very high stopband rejection and includes an output converter to synchronous mode, allowing integration with discrete-time systems.