Programmable Digital Arithmetic ICs with Matrix Switches

Abstract

An analog arithmetic circuit is generally composed of an operating amplifier and one or more resistors and capacitors. Different arithmetic functions of the circuits are realized by changing the circuit configurations. These analog arithmetic circuits can be converted into equivalent digital arithmetic circuits, each consisting of one or more adders, coefficient units and integrators. By adding a configuration control circuit to the above, a programmable integrated circuit (IC) which performs a variety of arithmetic functions is obtained. This paper reports the realization of such programmable ICs. Our future aim is faster calculation of the phenomena expressed in differential equations.