Differential amplifier circuit

Abstract

A differential amplifier circuit includes a pair of differential input signal terminals, first and second current output terminals, a first transistor whose collector is connected to the first current output terminal, a second transistor whose collector is connected to the second current output terminal, a third transistor whose collector and base are respectively connected to the emitter of the first transistor and the emitter of the second transistor, a fourth transistor whose collector and base are respectively connected to the emitter of the second transistor and the emitter of the first transistor, first and second resistors, and a constant current source circuit connected to the emitters of the third and fourth transistors via the first and seond resistors. Furthermore, the differential amplifier circuit includes first and second emitter followers, the input terminals of which are respectively connected to the pair of differential input signal terminals, and the output terminals of which are respectively connected to the bases of the first and second transistors.

Dependencies are inferred from the claim text.