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    • 2. 发明授权
    • Capacitance sensor
    • 电容传感器
    • US07944216B2
    • 2011-05-17
    • US12329335
    • 2008-12-05
    • Georg BrasseurThomas BretterklieberDirk HammerschmidtGert HollerTobias WerthHubert Zangl
    • Georg BrasseurThomas BretterklieberDirk HammerschmidtGert HollerTobias WerthHubert Zangl
    • G01R27/26
    • G01D5/2405
    • A capacitance sensor, having at least one electrode is disclosed. A frequency spread signal generation circuit is coupled to the at least one electrode to apply a frequency spread signal based on a spread sequence. A periodic signal with a frequency is coupled to the at least one electrode. A frequency controller is coupled to the frequency spread signal generation circuit to vary the frequency of the periodic signal. A receiver circuit is coupled to the at least one or a further electrode to receive a version of the frequency spread signal which depends on a capacitance applied to the at least one electrode. An evaluation circuit is coupled to the receiver circuit to determine a capacitance value based on the received, dependent version of the frequency spread signal.
    • 公开了具有至少一个电极的电容传感器。 频率扩展信号产生电路耦合到至少一个电极,以基于扩展序列施加频率扩展信号。 具有频率的周期性信号耦合到至少一个电极。 频率控制器耦合到频率扩展信号发生电路以改变周期信号的频率。 接收器电路耦合到所述至少一个或另一个电极,以接收取决于施加到所述至少一个电极的电容的所述频率扩展信号的形式。 评估电路耦合到接收器电路,以基于所接收的频率扩展信号的相关版本来确定电容值。