A four quadrant multiplier with independent control of range and sensitivity

An improved analog multiplier using the voltage variable resistance characteristics of a FET is presented. The scheme has independent control of the design condition, sensitivity, and range. A modified version, with a marginal increase in hardware but embodying the same operating principles, can work in all four quadrants in both DC and AC operations. The proposed multiplier is superior in performance to earlier schemes based on the same technique. Its design condition is independent of the inputs, unlike the earlier ones. Experimental results and appropriate error analysis are presented