Bipolar translinear four-quadrant analog multiplier

摘要

A bipolar analog multiplier is provided, which is capable of complete four-quadrant multiplication operation. This multiplier has a quadritail cell serving as a multiplier core circuit, and an input circuit. In the input circuit, first and second linear V-I converters linearly convert the applied first and second initial input voltages to first and third pairs of differential output currents, respectively. The first and third pairs of differential output currents are converted to first and second differential output voltages through logarithmic compression, respectively. First and second linear transconductance amplifiers amplify the first and second differential output voltage to generate second and fourth pairs of differential output currents. The second and fourth pairs of differential output currents are added to generate first, second, third, and fourth input currents. The I-V converter converts the applied first, second, third, and fourth input currents to the first, second, third, and fourth input voltages, which are applied to the quadritail cell, respectively.