SENSOR AND SIGMA-DELTA CONVERTER

摘要

A sensor for determining at least one parameter with a sigma-delta-converter (1) has connected input and feedback capacitors (Cf1, Cf2, Crefc1, Crefc2, Creff1, Creff2, Crt1, Crt2, Cr1, Cr2, Ctemp1, Ctemp2, Cs1, Cs2). At least one of the capacitors is configured in such a way that its capacitance depends on the parameter to be determined. In this way, changes in capacitance can be determined with the sigma-delta converter directly. A high degree of precision is obtained as a result of the symmetrical construction of the converter.