Patent ID: 9407219
Filing Date: 2016-08-02
CPC Classification: H03F

Claim Text:
1. A self-oscillating electronic circuit for amplifying a wanted signal in a wanted frequency band, comprising: a comparator having a first input, a second input and an output, wherein a connection is provided, which leads the wanted signal to the first input; at least a first driver stage comprising an input and an output, wherein the first driver stage includes at least a first push pull end stage, the output of said comparator leads to the input of said first driver stage; a low-pass filter having an input and an output, wherein the output of said first driver stage leads to the input of said low pass filter; a first feedback network, which connects the output of said first driver stage with the second input of said comparator; and a second feedback network, which connects the output of said low-pass filter with the second input of said comparator, wherein: said first feedback network and said second feedback network form together with said comparator said self-oscillating electronic circuit, said first feedback network and said second feedback form a total feedback network and said total feedback network has 360° phase shift and an amplification of 1, amplifying said wanted signal comprises a phase shift of about 180° with a countercoupling, which acts as an amplifier in said wanted frequency band, and the first and second feedback networks provide a part of the feedback before the low-pass filter, so that a stable control becomes possible.