Patent ID: 6583658
Filing Date: 2003-06-24
Classification: H03F,H03H

Abstract:
A balanced circuit arrangement for converting an asymmetrical analog input signal (S1) to a symmetrical output signal (S2, S3), in particular for feeding it to an analog/digital converter (4) with symmetrical analog inputs, comprisinga first amplifier (2), the non-inverting input of which is connected to the analog input signal (S1) and the output signal (S2) of which is fed back via a negative feedback to its inverting input; a second amplifier (3), the non-inverting input of which is connected to ground, the inverting input of which is connected to the output signal (S2) of the first amplifier (2) via a series resistor (R2) and the output signal (S3) of which is fed back to its inverting input in a negative feedback and by means of a negative feedback resistor (R1), wherein the negative feedback resistor (R1) and the series resistor (R2) have the same resistance value, characterized in that the base point of the signal source (1) for the analog input signal (S1) is connected to the output of the second amplifier (3), such that the signal source (1) forms a component of a negative feedback loop, which consists of the first amplifier (2), the series resistor (R2), the second amplifier (3) and the signal source (1), wherein a balanced terminal signal is generated at the two connections for the signal source (1).