Abidi, “An active resistor network for gaussian filtering of images

Abstract —The architecture of an active resistive mesh con-taining both positive and negative resistors to implement a Gaussian convolution in two dimensions is described. With an embedded array of photoreceptors, this may be used for image detection and smoothing. The convolution width is continuously variable by 2:1 under riser control. Analog circuits implement a 45X 40 mesh on a 2-pm CMOS IC, and perform an entire convolution in 20 ps on applied images. I