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    • 92. 发明授权
    • Method and apparatus for determining a capacitance and/or change in capacitance of a capacitive sensor element
    • 用于确定电容传感器元件的电容和/或电容变化的方法和装置
    • US08854063B2
    • 2014-10-07
    • US13271900
    • 2011-10-12
    • Bernhard Roth
    • Bernhard Roth
    • G01R27/26H03K17/955
    • H03K17/955H03K2217/960725
    • A method for determining a capacitance and/or a change in capacitance of a capacitive sensor element (C2) comprises the steps of: a) discharging an average value capacitor (C3), and either b1) discharging the capacitive sensor element and c1) charging an operating capacitor (C1) to a charging voltage (VDD), or b2) discharging the operating capacitor and c2) charging the capacitive sensor element to the charging voltage, d) connecting the operating capacitor to the capacitive sensor element, e) connecting the operating capacitor to the average value capacitor, and f) evaluating a voltage established across the operating capacitor or across the average value capacitor in order to determine the capacitance and/or the change in capacitance.
    • 一种用于确定电容传感器元件(C2)的电容和/或电容变化的方法包括以下步骤:a)对平均值电容器(C3)放电,以及b1)放电电容式传感器元件和c1)充电 操作电容器(C1)到充电电压(VDD),或b2)放电工作电容器,c2)将电容传感器元件充电到充电电压,d)将工作电容器连接到电容传感器元件,e) 操作电容器到平均值电容器,以及f)评估跨过工作电容器或跨平均值电容器建立的电压,以便确定电容和/或电容的变化。
    • 99. 发明授权
    • Methods and circuits for measuring mutual and self capacitance
    • 用于测量相互和自身电容的方法和电路
    • US08570052B1
    • 2013-10-29
    • US13664421
    • 2012-10-31
    • Cypress Semiconductor Corporation
    • Andriy Mahartya
    • G01R27/26
    • G01R27/2605H03K17/962H03K2217/960725H03K2217/960775H03M1/12
    • An embodiment of a capacitance measurement circuit may include multiple switches, a first node coupled with a first electrode and coupled with at least a first switch of the multiple switches, and a second node coupled with a second electrode and coupled with at least a second switch of the multiple switches, where the multiple switches are configured to reduce an influence of a self-capacitance of the first electrode and a self-capacitance of the second electrode on an output signal during measurement of a mutual capacitance between the first electrode and the second electrode, and where the multiple switches are configured to reduce an influence of the mutual capacitance on the output signal during measurement of at least one of the self-capacitance of the first electrode and the self-capacitance of the second electrode.
    • 电容测量电路的实施例可以包括多个开关,与第一电极耦合并与多个开关的至少第一开关耦合的第一节点,以及与第二电极耦合并与至少第二开关耦合的第二节点 的多个开关,其中多个开关被配置为在第一电极和第二电极之间的互电容的测量期间减小第一电极的自电容和第二电极的自电容对输出信号的影响 电极,并且其中多个开关被配置为在测量第一电极的自电容和第二电极的自电容中的至少一个时,减小互电容对输出信号的影响。