Patent ID: 6054897
Filing Date: 2000-04-25
Classification: H03F

Abstract:
A differential amplifier comprising:a non-linear distortion compensating circuit including a differential emitter follower, and a first group of current sources having a first differential pair of transistors having bases receiving a pair of emitter currents of said differential emitter follower, respectively, so that said first group of current sources are controlled by said pair of emitter currents of said differential emitter follower;a differential buffer including a second differential pair of transistors having bases receiving signals outputted from said non-linear distortion compensating circuit, respectively, anda base current compensating circuit for supplying at least a portion of each of base currents of said transistors of said second differential pair in said differential buffer and said transistors of said first differential pair in said first group of current sources,wherein said base current compensating circuit is internally provided in said non-linear distortion compensating circuit,and further wherein said base current compensating circuit includes a current mirror circuit for supplying a predetermined base current to said transistors of said second differential pair in said differential buffer.