Wallrapp, L.L.WallrappSeitzer, D.D.Seitzer2022-03-082022-03-081992https://publica.fraunhofer.de/handle/publica/302657A capacitance-frequency converter comprises a first changeover switch which switches a pole of the capacitor whose capacitance is measured either in a first switching state to a first potential or to a second switching state to a second potential, a second changeover switch, which switches the other pole of the capacitor whose capacitance is measured either in relation to a first switching state connectable to a node or to a second switching state to a third potential, a further capacitor which is linked to the node and to the fourth potential, a power source device connected to the node, a comparator whose first input is connected to the node and whose second input is connected to the fifth potential and whose output supplies the converter output signal, and a pulse generating circuit connected to the output of the comparator, said pulse generating circuit controlling the switching state of the changeover switch.de608patent1990-4039006