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1. 发明申请

WO9619865A2 AN AMPLIFYING CIRCUIT 审中-公开
标题翻译：放大电路
公开(公告)号：WO9619865A2
公开(公告)日：1996-06-27
申请号：PCT/IB9501089
申请日：1995-12-04
申请人： PHILIPS ELECTRONICS NV , PHILIPS NORDEN AB
发明人： HARKIN GERARD FRANCIS
IPC分类号： H03F1/34 , H03F3/45
CPC分类号： H03F1/342 , H03F3/45183 , H03F2203/45328 , H03F2203/45511 , H03F2203/45658
摘要： An amplifying circuit (1, 1a, 1b, 1c) has a low gain amplifier (2) having positive (2a) and negative (2b) inputs and an output (2c). A high impedance path (3) provided by, for example, a low gain unity buffer amplifier (30) feeds from the negative input (2b) to the output (2c) of the amplifier (2) a first voltage (KV ) equal to a second voltage (V ) at the positive input (2a) of the amplifier (2) multiplied by the reciprocal of the open loop gain (AOL) of the amplifier (2). This circuit simulates a unity gain buffer amplifier having a high input impedance and a high open loop gain using a low open loop gain amplifier and a feed forward arrangement. The use of a low gain amplifier (2) avoids the need for large area transistors and the resultant large parasitic capacitances and so facilitates high speed operation.
摘要翻译：放大电路（1,1a，1b，1c）具有具有正（2a）和负（2b）输入的低增益放大器（2）和输出（2c）。由例如低增益单位缓冲放大器（30）提供的高阻抗路径（3）从负输入端（2b）馈送到放大器（2）的输出端（2c），第一电压（KV + ）等于放大器（2）的正输入（2a）处的第二电压（V +）乘以放大器（2）的开环增益（AOL）的倒数。该电路使用低开环增益放大器和前馈布置来模拟具有高输入阻抗和高开环增益的单位增益缓冲放大器。使用低增益放大器（2）避免了对大面积晶体管的需要，并且由此产生的大的寄生电容因此有利于高速运行。

2. 发明申请

WO9849691A3 FINGERPRINT SENSING DEVICES AND SYSTEMS INCORPORATING SUCH 审中-公开
标题翻译：指纹感应装置和系统等
公开(公告)号：WO9849691A3
公开(公告)日：1999-02-04
申请号：PCT/IB9800407
申请日：1998-03-19
申请人： KONINKL PHILIPS ELECTRONICS NV , PHILIPS SVENSKA AB
发明人： BIRD NEIL CHRISTOPHER , HARKIN GERARD FRANCIS
IPC分类号： G01B7/28 , G06K9/00 , H01B7/04
CPC分类号： G06K9/0002
摘要： A fingerprint sensing device comprises an array of sense elements (12) which each include a sense electrode (33), providing in combination with an overlying fingerprint part a capacitance (35), and first and second diode devices (30, 31) connected respectively between the sense electrode and associated ones (18, 20) of first and second sets (e.g. row and column) address conductors. An address circuit (22, 24) connected to the address conductors biases the diode devices in a respective address period such that a potential is applied via the first address conductor and the first diode device to the sense electrode and thereafter stored charge, indicative of the capacitance, is transferred via the second diode device to the second address conductor. The device offers fast, reliable, scanning and can conveniently be implemented using thin film technology for low cost and compactness.

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