CIRCUIT FOR CONDITIONING SMALL ELECTRICAL SIGNALS AND METHOD FOR CONTROLLING SAID CIRCUIT

摘要

The invention relates to a circuit for conditioning small electrical signals and to the method for controlling said circuit. The circuit comprises: an instrumentation amplifier (Amp1) including a first input (Amp1+) connected to a first receiver electrode (E1) in contact with a first area (A) of a medium (H) and a second input (Amp1-); a voltage-generating device (D) connected to a voltage-supply electrode (E3) in contact with a second area (C) of the medium (H) in order to apply a fixed-value continuous reference electrical signal thereto; and compensation means, which are electrically insulated from the device (D), in order to compensate for the continual movements of a small electrical signal (SE1) received by the first electrode (E1), generating a reference voltage signal (Vref1) with a value that can be modified using a control system and supplying same to the second input (Amp1-). The invention also relates to the method for controlling said circuit.