Patent ID: 7639051

Claim:
A circuit for rectifying the output voltage of a sensor, supplied with an AC signal from an oscillator for sensing a non-electrical variable, wherein the amplitude and phase angle of the output voltage is a measure of the non-electrical variable, the rectifying circuit including a ramp-generating circuit; and wherein: the output voltage (u 1 ) of the sensor ( 11 ) is supplied to the ramp-generating circuit ( 10 ; 45 ; 48 ), the mathematical sign of the transmission behavior of the ramp-generating circuit ( 10 ; 45 ; 48 ) can be controlled, and the mathematical sign of the transmission behavior of the ramp-generating circuit ( 10 ; 45 ; 48 ) is controlled by a switching signal (u 0 *), whose flanks correspond to zero crossings of the output voltage (u 1 ) of the sensor ( 11 ).