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    • 1. 发明公开
    • Sensor signal detection circuit
    • Sensorsignaldetektionsschaltung
    • EP2120004A1
    • 2009-11-18
    • EP09160005.6
    • 2009-05-12
    • Mitutoyo Corporation
    • Yoshitani, Satoshi
    • G01B7/016H03K5/08
    • G01B7/016H03K5/082H03K5/084
    • A DC sensor signal includes a low-frequency state variation component and a high-frequency noise component both superimposed on a DC level variation component.
      A comparing portion samples and compares a reference signal and the DC sensor signal to output a comparison signal. A low-pass filter is inputted with the DC sensor signal and cuts off the high-frequency noise component and the DC level variation component therefrom to pass the low-frequency state variation component. A first reference signal generating portion amplifies an output signal of this low-pass filter at a fixed ratio to generate a first reference signal. A second reference signal generating portion, when the comparison signal is outputted, generates a second reference signal having a fixed values, A selecting portion selects as the reference signal the first reference signal or the second reference signal.
    • DC传感器信号包括两个叠加在DC电平变化分量上的低频状态变化分量和高频噪声分量。 比较部分对参考信号和DC传感器信号进行采样和比较,以输出比较信号。 输入低通滤波器的直流传感器信号,并切断高频噪声分量和直流电平变化分量,以通过低频状态变化分量。 第一参考信号产生部分以固定比率放大该低通滤波器的输出信号,以产生第一参考信号。 第二参考信号产生部分,当输出比较信号时,产生具有固定值的第二参考信号,A选择部分选择第一参考信号或第二参考信号作为参考信号。