Amplifier circuit suitable for amplifying differential input signals and providing a single ended output signal

摘要

The amplifier circuit, which is suitable for manufacture in monolithic form, converts a differential driving signal having an arbitrary D.C. level into a single-ended output signal having a predetermined D.C. level. Included within the amplifier circuit are first and second stages, each having an input terminal coupled to one of the output terminals of a differential driving source through a zener diode which prevents the differential driving source from being saturated. The output terminal of the first stage is coupled to the input terminal of the second stage. Currents having predetermined relationships to each other are coupled to the second stage to prevent non-linear operation in response to input signals having small magnitudes. A reference voltage supply is coupled to the output terminal of the amplifier for establishing the predetermined D.C. output level.