FOUR QUADRANT MULTIPLIER USING PULSE WIDTH MODULATORS AND THE DIGITAL EXCLUSIVE-OR

摘要

There is disclosed a four quadrant multiplier circuit and method in which the signals to be multiplied are used to pulse width modulate carrier signals of different frequencies, respectively, and the resulting pulse width modulated signals are applied to an exclusive - OR circuit. The output of the exclusive - OR circuit is filtered to remove the carrier signals and any beat frequency between the carriers so that the output will be proportional to the bi-polar product of the signals being multiplied.