Differential amplifier

摘要

A differential amplifier achieving a high throughput rate with reduced power consumption includes a differential circuit (1), output circuit (2), a constant current source transistor (21), a drive transistor (3), and a switching circuit (4). A difference voltage (Vx) relative to a difference between voltages applied to non-inverting and inverting inputs of the differential circuit (1) is applied to the switching circuit (4). The switching circuit (4) supplies a drive signal to the drive transistor (3) to enable the drive transistor (3) when the difference voltage (Vx) is below a predetermined threshold voltage (VT), and to disable the drive transistor (3) when the difference voltage (Vx) is above the predetermined threshold voltage. <IMAGE>