Electronic capacity converter with interference compensation, integrated circuit and method for interference compensated electronic capacity conversion

摘要

The invention relates to an electronic capacitance converter (1, 5, 10, 15, 20) which has an oscillator (K) which has a capacitance value (C, C) of an electrical capacitance (C, C) electrically connected to an oscillator input to a predeterminable one Maps the oscillation period (T, T, T) of an output signal (U) output at an oscillator output, at least two input connections (E, E) for the electrical connection of an electrical capacitance (C, C) to each of the input connections (Eo, E), a controllable switching device (Q) which, depending on a control signal (S) supplied to it, electrically connects a defined one of the input connections (E, E) to the oscillator input, a time measuring device (B) which determines the oscillation period (T, T, T) of the output signal (U) measures and provides it as a time measurement value, a counting device (Z) with at least one counting step, which measures the number of time measurements provided by the time measurement device (B) values counts as a count value and supplies the switching device (Q) with the control signal (S) which, depending on the current count value, is selected so as to electrically connect a defined one of the input connections (E, E) to the oscillator input, at least one memory unit (M), which stores at least one time measurement value provided by the time measurement device (B), and at least one comparison unit (Re) which is set up and arranged to link at least two time measurement values provided by the time measurement device (B) at different times using a predeterminable calculation rule and the linking result As a comparison value, at least one of the time measurement values to be linked is the time measurement value previously stored in the memory unit (Mo). The invention further relates to an integrated circuit (6) with an electronic capacity converter (1, 5, 10, 15, 20) and a Process for interference influence compensated electronic capacity implementation.