Sigma delta modulator for e.g. rotational speed sensor, for vehicle, has control unit generating control signal, where output signal or reading signal is reinjected to input of forward branch based on control signal

摘要

The modulator (1) has a forward branch (10) supplied with an input signal (Sin) at an input of the path. A feedback branch (20) is formed to temporally feedback an output signal (Sout) from the forward branch to the input. A signal source (30) generates a reading signal (Ssense) that corresponds to a voltage curve at a sensor element (50) during measurement. A control unit (40) generates a control signal, where the output signal or the reading signal is reinjected to the input of the forward branch based on the control signal. An independent claim is also included for a sensor arrangement for measuring rotational speed, comprising a gyroscopic sensor element.