A CCD split-electrode transversal filter (EPSEF) with analog controlled tap weights is described. The programmable tap weighting utilizes a novel analog multiplier for sampled data, based on charge profiling underneath a resistive gate structure. The EPSEF device concept and the performance data of a prototype filter with eight programmable taps are presented. Applications of the EPSEF in several programmed filter functions and in an adaptive filter system are demonstrated.
Wallinga, H., & Pelgrom, M. J. M. (1979). An Electrically Programmable Split-Electrode Charge-Coupled Transversal Filter (EPSEF). IEEE journal of solid-state circuits, 15(5), 899-907. https://doi.org/10.1109/JSSC.1980.1051490