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    • 1. 发明授权
    • Dielectric constant measurement circuit and dielectric constant measurement method
    • 介电常数测量电路和介电常数测量方法
    • US09423438B2
    • 2016-08-23
    • US14100027
    • 2013-12-09
    • NATIONAL TAIWAN UNIVERSITYNational Taiwan University of Science and Technology
    • Chii-Wann LinSheng-Yu PengBo-Shen ChenJhih-Hong Lin
    • G01R27/02G01R27/26G01N33/02
    • G01R27/2623G01N33/02
    • A dielectric constant measurement circuit includes a dielectric constant sensor, an oscillator controlling circuit, a waveform converting circuit, and a counting readout circuit. The oscillator controlling circuit generates an oscillation waveform according to the response of the dielectric constant sensor to a dielectric material. The waveform converting circuit converts the oscillation waveform into frequency division square waves. The counting readout circuit includes a switching counter, a switching circuit, a reference current source, and a current integrator. The reference current source charges the current integrator through the switching circuit controlled by the frequency division square waves, and the switching counter counts the number of the turned-on states of the switching circuit and stops counting the number of the turned-on states when a value of the output voltage from the current integrator reaches a value of the reference voltage, and the number of the turned-on states is related to the oscillation frequency.
    • 介电常数测量电路包括介电常数传感器,振荡器控制电路,波形转换电路和计数读出电路。 振荡器控制电路根据介电常数传感器对介质材料的响应产生振荡波形。 波形转换电路将振荡波形转换成分频方波。 计数读出电路包括开关计数器,开关电路,参考电流源和电流积分器。 参考电流源通过由分频方波控制的开关电路对电流积分器充电,并且开关计数器对开关电路的接通状态的数量进行计数,并且当a 来自电流积分器的输出电压的值达到参考电压的值,并且导通状态的数量与振荡频率相关。