Patent ID: 7839320

Claim:
A measurement amplification device for detecting a monopolar input signal (U E ) and for generating a digital output value as a measure for the input signal (U E ), comprising: a switchable inverter which is controlled by a clock pulse generator with a polarity-reversal clock pulse, said inverter converting the input signal (U E ) into a bipolar intermediate signal (U Z ) with the polarity-reversal clock pulse, and an A/D converter which generates the digital output value depending on the intermediate signal, wherein the A/D converter comprises: an integrator which repetitively integrates (a) the intermediate signal (U Z ), which is continuously applied to said integrator during operation, and (b) a working level of a bipolar reference signal (U ref ), which is applied to said integrator intermittently, the reference signal (U ref ) originating from a switchable reference voltage source controlled by the clock pulse generator, a comparator connected downstream of the integrator and comparing an integrator output signal with a threshold value, wherein an output signal of the comparator, which depends on the comparison result, is fed back as a control signal (S Z ) to the inverter and to the reference voltage source, and a time measurer determining durations of measured intervals (T m ) during which the working level of the reference signal (U ref ) is applied to the integrator, as a basis of the measure for the input signal, wherein the switchable reference voltage source is synchronized with the inverter via the control signal (S Z ), which is fed back in order to pre-determine the polarity-reversal clock pulse, and wherein the reference signal (U ref ) is bipolar with the polarity-reversal clock pulse.