Four-quadrant multiplier

A multiplier for developing a product signal proportional to a multiplicand signal multiplied by multiplier signal comprising, in combination:

• first and second field effect transistors respectively of first and second conductivity types complementary to each other, each having source and drain electrodes and a channel therebetween and having a gate electrode;
• means for maintaining the source electrodes of said first and second transistors at a reference potential;
• means for applying to the drain electrode of said first transistor a first drain potential having a direct component equal to said reference potential and having a component indicative of said multiplier signal superimposed on its direct component;
• means for applying to the gate electrode of said first transistor a first gate potential having a direct component for operating said first transistor in its triode region and having a component indicative of said multiplicand signal superimposed on its direct component;
• means for applying to the drain electrode of said second transistor a second drain potential having a direct component equal to said reference potential and having a component indicative of said multiplier signal superimposed on its direct component, the components of said first and second drain potentials indicative of said multiplier signal being complementary or anti-phase to each other;
• means for applying to the gate electrode of said second transistor a second gate potential for operating said second transistor in its triode region;
• and
• means connected to additively combine the currents flowing in the channels of said first and second field effect transistors responsive to the potentials applied to them to derive said product signal substantially free of first-order and second-order multiplier signal terms.