Differential amplifier providing precisely balanced output signals and having low power consumption

摘要

A differential amplifier which provides a precise phase difference of 180 degrees between a pair of differential output signals and which has low power consumption. The differential amplifier comprises a differential amplifying stage which has a differential pair of transistors. An unbalanced input signal is applied to the control electrode of one of the transistors and a pair of differential signals are outputted from a pair of output nodes of the differential amplifying stage. The differential amplifier also has a signal delay element, coupled between the output node on the side of the transistor to which the unbalanced input signal is applied and an output terminal of the differential amplifier, for compensating the phase difference. The signal delay element may have a plurality of taps for precisely adjusting the phase difference.