A new structure for video-rate 2D SC FIR filters

Since Switched Capacitor (SC) circuits operate with discrete-time analog signals, it becomes rather attractive revisiting traditional video operations in the attempt of replacing systems currently implemented digitally with SC circuits, wherever possible. Indeed substituing the digital part for an analog one leads to substantial improvements with respect to power and area characteristics. This kind of circuit variations poses a number of challeging problems mainly related to the fact that the circuit cloks are at video-rate. This work describes possible solutions to these problems exemplified by the SC realization, by standard monolithic CMOS technology of a 2-D low-pass filter designed for picture-in-picture (PIP) resizing.