Analog Computation with Magnetoresistance Multipliers

Novel technique multiplies and divides in same package, achieves up to 0.1% accuracy for total cost less than $350 and provides electrical isolation between input and output signals.

This article describes a little-known technique for multiplying, dividing and otherwise manipulating AC and DC signals using flux-variable resistors (magneto-resistors) in a novel bridge configuration. The basic magneto-resistance bridge forms a four-quadrant multiplier, but with the aid of operational amplifiers, provides 0.1% linearity in squaring, square-rooting, modulating, mixing, demodulating, rectifying, and related applications. Read full article



Robert Gitlin