One -quadrant multiplier

The utility model discloses an one -quadrant multiplier, including multiplication unit and load equivalent resistance, the multiplication unit includes operational amplifier, first resistance, secondresistance and opto -coupler, and first resistance one end is connected with operational amplifier's non inverting input end, and its other end is as the the first signal input. On the circuit betweenfirst resistance and operational amplifier was connected to second resistance one end, its other end ground connection was equipped with the 2nd signal input part on the ground circuit of second resistance, and operational amplifier's output and inverting input end are connected with the positive and negative input end of opto -coupler respectively. The quantity of multiplication unit is N, and the optocoupler output end of a N multiplication unit is established ties, and opto -coupler series connection polarity is unanimous, these series branch both ends respectively power connection and, load equivalent resistance c