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A four quadrant multiplier suitable for neural networks is presented. The product of two analogue voltages Vx and Vw is achieved by performing the difference of two currents, I/sub 1/ and I/sub 2/, that are nonlinearly related to Vx and Vw. Both currents are passed through the same transistor in two different time slices, eliminating, thereby, problems due to component mismatch. A test chip has been designed and fabricated in a 3 mu m CMOS technology.<<ETX>>