Charge transfer device transversal filter having electronically controllable weighting factors

摘要

A charge transfer device transversal filter is provided having electronically controllable weighting factors. Two equivalent and corresponding charge transfer device shift registers have floating electrodes sandwiched between the sensing electrodes and the substrate for biasing the underlying depletion regions and thereby controlling the effective capacitances thereof. Depletion capacitances are controlled so as to produce desired weighting factors when corresponding and otherwise equal charging currents are substrated one from the other.