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Abstract

A circuit arrangement for processing sampled analog electrical signals where each sample being in the form of an electrical current. The circuit arrangement includes apparatus for combining, in predetermined proportions, the input sample current in a present sample period with current(s) derived from input sample current(s) in one or more preceding sample periods, and apparatus for deriving the processed output signal from the combined current produced by the combining means in successive sample periods. The circuit arrangement consists of a plurality of circuit modules each of which deliver and accept bi-directional signal currents and which contain current sources so that internally only unidirectional currents are processed. The transistors which conduct signal currents are arranged to be of one conductivity type only. This reduces the voltage requirements at the interfaces between modules.

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First Claim