A current-reused low-power four-quadrant multiplier with single-ended current output

This paper presents an alternative topology for realizing a four-quadrant amplifier with single-ended output. In the proposed multiplier, constituting differential circuits are vertically arranged resulting in single-ended current output with output DC voltage equal to a half of supply voltage. Since the circuit operates in a current-reused mode, the power consumption is systematically reduced by a factor of 50% compared to the original topology. The proposed multiplier is designed based on a 0.18 mum CMOS process and can operates under a 1.2 V supply.