KAPAZITAETS-SPANNUNGSWANDLER

摘要

A capacitance-to-voltage transformation circuit for providing an output voltage proportional to capacitive variations includes a variable capacitor, a reference voltage source, and circuit means for charging the variable capacitor to the reference potential. A switch means alternately connects the variable capacitor to the charging means and to ground at a cyclical rate determined by an oscillator clock. An impedance means coupled between the charging and switch means, develops a voltage drop thereacross of a magnitude directly proportional to capacitance variations of the variable capacitor.