Patent ID: 6188280
Filing Date: 2001-02-13
Classification: H03F

Abstract:
A differential amplifier, comprising:an emitter follower pair operative to receive an input differential voltage signal for shifting the input differential voltage signal to develop a shifted differential voltage signal;a first differential pair configured to feed a first differential current inversely to the emitter follower pair such that a transconductance of the emitter follower pair changes inversely to compensate for a change in a transconductance of the first differential pair; anda main differential amplifier, including a fifth transistor with an emitter, a sixth transistor with an emitter, and a first resistor and a second resistor coupled in series between the emitters of the fifth and sixth transistors, wherein the main differential amplifier is coupled to receive the shifted differential voltage signal and being configured to amplify the shifted differential voltage signal to generate an output voltage signal.