Circuit arrangement involving a four-pole connected to the input with one pole and an amplifier for the compensation of a reference potential

摘要

The circuit arrangement includes a two-pole changeover switch (4), which is connected such that in a first position a connection (6) of the source (2) (having first and the output of the amplifier (3) having a second input terminal 8 or 9 ) of the quadripole (1) and that in its second position vice versa, the terminal (6) of the source (2) with the second and the output of the amplifier (3) to the first input terminal (9 or 8) of the quadripole (1 ) connected is. A reference potential leading output port (11) of the quadripole (1) is led to an inverting input of the amplifier (3), (U _R) is during the non-inverting input connected to a constant reference voltage. The circuit arrangement serves to switch the polarity of a signal dependent on an input signal useful component of the output signal of the quadripole (1) without causing at the same time reversed the polarity of an internally in the quadrupole (1) disturbance component generated and an additional interference component in the downstream of the quadrupole processing electronics generated becomes.