MULTIPLE-INPUT FOUR-QUADRANT MULTIPLIER

A four-quadrant multiplier based on a Gilbert cell is utilized to multiply several signals by a similar signal. The transistors in two pairs of coupled differential amplifiers of one input terminal of the inner multiplier that is activated like a Gilbert cell by way of a diode-and-transistor section have several emitters. Each pair of emitters in the right and the left branch of the miltiplier can be oppositely activated by way of a source of variable current or by way of a series of a transistor and a source of current. To process square-wave signals, the source of variable current is a source that can be engaged and disengaged by I.sup.2 L gates.