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1. 发明申请

WO2017184060A1 FINGERPRINT SENSING SYSTEM WITH SENSING REFERENCE POTENTIAL PROVIDING CIRCUITRY 审中-公开
标题翻译：指纹识别潜在提供电路的指纹识别系统
公开(公告)号：WO2017184060A1
公开(公告)日：2017-10-26
申请号：PCT/SE2017/050372
申请日：2017-04-12
申请人： FINGERPRINT CARDS AB
发明人： SUNDBLAD, Rolf , HJALMARSON, Emil , SÄLL, Erik , OLSSON, Allan , DE LANGEN, Klaas-Jan
IPC分类号： G06K9/00 , G06F3/041
摘要： A fingerprint sensing system comprising a device connection interface including a device reference potential input, a sensing arrangement, and sensing reference potential providing circuitry. The sensing arrangement includes multiple sensing structures and read-out circuitry connected to each of the sensing structures. The sensing reference potential providing circuitry provides a sensing reference potential to the sensing arrangement in the form of a sensing reference signal alternating between a first sensing reference potential and a second sensing reference potential,and comprises a first capacitor;a second capacitor;charging circuitry; and switching circuitry for alternatingly switching the sensing reference potential providing circuitry between a first state in which the first capacitor and the second capacitor are connected in parallel to the charging circuitry; and a second state in which the first capacitor and the second capacitor, when charged,are connected in series between the device reference potential input and the sensingarrangement.
摘要翻译：包括装置连接接口的指纹感测系统包括装置参考电势输入，感测装置和感测参考电势提供电路。感测装置包括连接到每个感测结构的多个感测结构和读出电路。感测参考电位提供电路以第一感测参考电位与第二感测参考电位之间交替的感测参考信号的形式向感测装置提供感测参考电位，并且包括第一电容器;第二电容器;充电电路; 以及开关电路，用于在所述第一电容器和所述第二电容器并联连接到所述充电电路的第一状态与所述充电电路之间交替地切换所述感测参考电势提供电路; 在第二状态中，第一电容器和第二电容器在充电时串联连接在器件参考电势输入和感测布置之间。

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