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System and method for high resolution sensing of capacitance or other reactive impedance change in a large dynamic range
System and method for high resolution sensing of capacitance or other reactive impedance change in a large dynamic range
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机译:用于在大动态范围内高分辨率感测电容或其他无功阻抗变化的系统和方法
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摘要
Systems and methods are provided for sensing or measuring capacitive or inductive reactance or changes in reactance in which the sensed reactance is coupled with a known resistance in a sensor circuit and a start signal is provided to the sensor circuit, and a programmable delay line is used to generate a programmable delay signal. The outputs of the programmable delay and the sensor circuits are compared to ascertain which transitions first, and the programmable delay value is adjusted in successive approximation fashion to identify a programmable delay that best represents the delay time of the sensor circuit from which the sensed reactance value can be determined.
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