1. In an integrated-circuit having within its confines an array of weighted summation circuits, N in number, each weighted summation circuit capable of generating a weighted sum response to a common plurality of input signals, M in number, and including at least one corresponding capacitive element for determining weighting of each of said input signals within that said weighted summation circuit, an improvement wherein said at least one corresponding capacitive element is of a type having its capacitance value determined incrementally in accordance with bits of a digital word which is received at a control input port.