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5 条记录 (耗时 0.01 秒)

    ONE TERMINAL CAPACITOR INTERFACE CIRCUIT
    1.
    发明公开
    ONE TERMINAL CAPACITOR INTERFACE CIRCUIT 有权
    与终端电容接口电路

    公开(公告)号：EP1861723A2

    公开(公告)日：2007-12-05

    申请号：EP06737390.2

    申请日：2006-03-08

    申请人： Analog Devices, Inc.

    发明人： O'DOWD, John ,  MCCARTNEY, Damien ,  BANARIE, Gabriel

    IPC分类号： G01R27/26 ,  H03M3/00

    CPC分类号： G01D5/24 ,  G01P15/125 ,  H03M3/34 ,  H03M3/458

    摘要： A one terminal capacitor interface circuit (40) for sensing the capacitance of a capacitor (52) includes a differential integrating amplifier (44) having an input common mode voltage and two summing nodes (66) and (68) whose voltage is substantially equal to the input common mode voltage, a switching circuit (57) for charging the capacitor (52) to a first voltage level (Vx) in a first phase(Phl ), connecting, in a second phase (Ph2), the capacitor (52) to one of the summing nodes (66) of the differential amplifier (44) to provide a first output (Vop); charging the capacitor (52) to a second voltage level (Vz) in a third phase (Ph3), and connecting, in a fourth phase (Ph4), the capacitor (52) to the other summing node (68) of the differential amplifier (44) to provide a second output (Von); the combined first and second outputs (Vop) and (Von), representing the capacitance of the capacitor (52) substantially independent of the input common mode voltage.

    VARIABLE CAPACITANCE SWITCHED CAPACITOR INPUT SYSTEM AND METHOD
    5.
    发明公开
    VARIABLE CAPACITANCE SWITCHED CAPACITOR INPUT SYSTEM AND METHOD 有权
    可变电容开关电容输入系统及方法

    公开(公告)号：EP1784916A1

    公开(公告)日：2007-05-16

    申请号：EP05761191.5

    申请日：2005-06-13

    申请人： Analog Devices, Inc.

    发明人： O'DOWD, John ,  MCCARTHY, Damien

    IPC分类号： H03M1/12

    CPC分类号： H03M3/34 ,  H03M3/43

    摘要： A variable capacitance switched capacitor input system and method includes a differential integrator circuit having first and second input summing nodes and a variable sensing capacitor; one terminal of the variable sensing capacitor is connected to one of the nodes in the first phase and to the other of the nodes in the second phase; an input terminal connected to a second terminal of the variable sensing capacitor receives a first voltage level in the first phase and a second voltage level in the second phase for delivering the charge on the variable sensing capacitor to the first summing node in the first phase and to the second summing node in the second phase and canceling errors in a differential integrator circuit output caused by leakage current.

    摘要翻译： 可变电容开关电容器输入系统和方法包括具有第一和第二输入求和节点以及可变感测电容器的差分积分器电路; 可变感测电容器的一个端子连接到第一阶段中的一个节点并且连接到第二阶段中的另一个节点; 连接到可变感测电容器的第二端子的输入端子接收第一相位中的第一电压电平和第二相位中的第二电压电平，以将可变感测电容器上的电荷递送到第一相位中的第一求和节点，以及 到第二阶段的第二求和节点，并消除由漏电流引起的差分积分器电路输出中的误差。