公开(公告)号：US20060175540A1

公开(公告)日：2006-08-10

申请号：US11348260

申请日：2006-02-07

申请人： Takao Tsuruhara

发明人： Takao Tsuruhara

IPC分类号： H01J40/14 ,  H03F3/08

CPC分类号： G01P15/125 ,  G01C19/56

摘要： The capacitance type physical quantity sensor has a sensing part including a capacitor element generating a capacitance signal representing a magnitude of a physical quantity to be sensed, and a sensor circuit including a charge amplifier converting the capacitance signal into a voltage signal. The charge amplifier includes an operational amplifier applied with the capacitance signal at an inverting input terminal thereof and applied with a reference voltage at a non-inverting input terminal thereof, a first capacitor connected between the inverting input terminal and an output terminal of the operational amplifier, a feedback resistor connected in parallel to the first capacitor, and a switch connected in parallel to the first capacitor and configured to be closed to make a short circuit between the inverting input terminal and the output terminal upon receiving a refresh signal supplied from outside.

摘要翻译： 电容型物理量传感器具有感应部，该感测部包括产生表示待感测物理量的电容信号的电容器元件，以及包含将电容信号变换为电压信号的电荷放大器的传感器电路。 电荷放大器包括在其反相输入端施加电容信号的运算放大器，并在其非反相输入端施加参考电压，第一电容器连接在运算放大器的反相输入端和输出端之间 与第一电容器并联连接的反馈电阻器，以及并联连接到第一电容器并且被配置为闭合的开关，以在接收到从外部提供的刷新信号时在反相输入端子和输出端子之间产生短路。

公开(公告)号：US06927711B2

公开(公告)日：2005-08-09

申请号：US10797080

申请日：2004-03-11

申请人： Noboru Endo ,  Takao Tsuruhara

发明人： Noboru Endo ,  Takao Tsuruhara

IPC分类号： G01L9/00 ,  G01D3/02 ,  G01D3/028 ,  G01D5/12 ,  G01L19/08 ,  G01R27/08 ,  G01R33/02 ,  H03L1/02 ,  H03M1/00

CPC分类号： G01D3/028 ,  G01L19/083

摘要： The present invention relates to a sensor apparatus capable of outputting an accurate sensor signal irrespective of a variation of power supply voltage. In the sensor apparatus, when an A/D conversion circuit produces and outputs digital data, a switch circuit is placed into a first switching condition so that a constant voltage is applied from a constant-voltage circuit to an oscillation circuit, and a stabilized oscillation frequency is outputted from the oscillation circuit to the A/D conversion circuit. Thus, even if a power supply voltage varies, the A/D conversion circuit carries out sampling processing on analog data on the basis of the stabilized oscillation frequency from the oscillation circuit to produce and output the digital data.

摘要翻译： 本发明涉及能够输出精确的传感器信号而与电源电压的变化无关的传感器装置。 在传感器装置中，当A / D转换电路产生并输出数字数据时，将开关电路置于第一开关状态，使得从恒压电路向振荡电路施加恒定电压，并且稳定振荡 频率从振荡电路输出到A / D转换电路。 因此，即使电源电压变化，A / D转换电路基于来自振荡电路的稳定振荡频率对模拟数据进行采样处理，以产生并输出数字数据。