Patent ID: 7053603

Claim:
A circuit arrangement, comprising: a linear variable differential transformer as a displacement sensor; a selection circuit which is connected to a primary coil of the transformer and which provides an output current for triggering the primary coil; an analysis circuit which is connected to secondary coils of the transformer and which provides a measurement signal; and a control circuit to trigger the selection circuit and the analysis circuit and to process the measurement signal provided by the analysis circuit is connected to the primary coil to calculate a temperature of the circuit arrangement, and is configured such that it determines the temperature-dependent ohmic resistance of the primary coil and calculates the temperature and corrects accordingly the measurement signal provided by the analysis circuit, the current having a trapezoidal characteristic through the primary coil with equally high rising edge and falling edge values, and the control circuit configured such that sampling values of a rectangular voltage picked up on the primary coil and of a voltage proportional to the current through the primary coil are taken at times at which the trapezoidal current has a constant characteristic.