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1. 发明申请

US20110084711A1 CAPACITANCE SENSING CIRCUIT WITH ANTI-ELECTROMAGNETIC INTERFERENCE CAPABILITY 审中-公开
标题翻译：具有抗电磁干扰能力的电容式感应电路
公开(公告)号：US20110084711A1
公开(公告)日：2011-04-14
申请号：US12900622
申请日：2010-10-08
申请人： YU-CHENG CHANG , CHUNG-YUAN CHEN
发明人： YU-CHENG CHANG , CHUNG-YUAN CHEN
IPC分类号： G01R27/26
CPC分类号： G01D5/24 , G01R27/2605 , H03K2217/960705
摘要： The present invention relates to a capacitance sensing circuit with anti-EMI capability. A filter is coupled to a capacitor under test; receives a plurality of reference signals; and produces a first filter signal and a second filter signal. A difference circuit receives the first and second filter signals; eliminates the common-mode noise in the first and second filter signals; and produces a difference signal. The amplitude of the difference signal is related to the capacitance value of the capacitor under test. Thereby, the purpose of sensing capacitance can be achieved. In addition, by eliminating common-mode noise using the difference circuit, the anti-EMI capability can be achieved. Because the difference circuit can adjust the dynamic range of the output of the filter, the capacitance sensing circuit with anti-EMI capability can achieve capacitance sensing in few clock cycles.
摘要翻译：本发明涉及具有抗电磁干扰能力的电容感测电路。滤波器耦合到被测电容器; 接收多个参考信号; 并产生第一滤波器信号和第二滤波器信号。差分电路接收第一和第二滤波器信号; 消除了第一和第二滤波器信号中的共模噪声; 并产生差分信号。差分信号的幅度与被测电容器的电容值有关。因此，可以实现感测电容的目的。此外，通过使用差分电路消除共模噪声，可以实现抗EMI能力。由于差分电路可以调节滤波器输出的动态范围，具有抗EMI能力的电容感测电路可以在几个时钟周期内实现电容感测。

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