专利名称：Method and apparatus for capacitance
sensing
发明人：Yannick Guedon,Kien Beng Tan申请号：US12943241申请日：20101110公开号：US08344928B2公开日：20130101
专利附图：
摘要：A capacitance-to-digital converter for an extended range of capacitancesincludes a reference capacitor and one or more offset capacitors. Electrical chargeaccumulated in the offset capacitors is used to at least partially cancel the charge
accumulated in a sensed capacitance to facilitate matching with a charge accumulated inthe reference capacitor. The residual charge is passed to an integrator, the output fromwhich is quantized and used to control switching of the capacitors. Immunity to tonalexternal noises and improved conversion speed are achieved by controlling the capacitorswitching with a spread spectrum clock. The capacitance-to-digital converter may beused, for example, for sensing of the capacitances of capacitive elements in touch andproximity displays or other user interfaces.
申请人：Yannick Guedon,Kien Beng Tan
地址：Singapore SG,Singapore SG
国籍：SG,SG
代理机构：Leveque IP Law, P.C.
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容