Patent ID: 7432764

Claim:
A push-pull amplifier with transformational negative feedback for amplification of variable electrical signals, comprising: a signal input and a signal output; a transformational negative feedback connected with said signal input and said signal output; an amplifier circuit comprising an input and an output as well as a first transistor and a second transistor, said input of said amplifier circuit being connected with said signal input, and said output of said amplifier circuit being connected with said signal output via the transformational negative feedback; said transformational negative feedback is a directional coupler transformer which comprises an input transformer and an output transformer with a respective primary coil and a secondary coil; said input of said amplifier circuit is being connected with said signal input via said primary coil of the input transformer and said input of said amplifier circuit being connected with a reference potential via said secondary coil of said output transformer, at least for the variable electrical signal to be amplified; and said output of the said amplifier circuit being connected with said signal output via said primary coil of said output transformer and said output of said amplifier circuit being connected with said reference transformer potential via said secondary coil of the input transformer, at least for the variable electrical signal to be amplified.