A two-quadrant analog multiplier integrated circuit

A pulse-width-amplitude-modulation approach is used in an integrated-circuit design of a two-quadrant analog multiplier. The circuit described is a single-chip PWAM multiplier of comparable cost to monolithic transconductance multipliers. It requires an external capacitor and a low-pass filter and achieves accuracies better than 0.5 percent without trimming. Temperature stability is typically 0.005 percent per degree Celsius.