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Inertial force sensor and zero point correction method used therein

  • US 8,939,007 B2
  • Filed: 04/26/2012
  • Issued: 01/27/2015
  • Est. Priority Date: 04/27/2011
  • Status: Expired due to Fees
First Claim
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1. An inertial force sensor comprising:

  • a detecting element;

    a detecting circuit for detecting an amount of inertia corresponding to an inertial force applied to the detecting element;

    an A/D converter for converting an output of the detecting circuit to a digital signal;

    a first filter connected to an output port of the A/D converter;

    a correction circuit for correcting an output of the first filter;

    a clock generator for generating a first clock and a second clock having a frequency higher than a frequency of the first clock; and

    a clock selector for selecting and outputting one of the first clock and the second clock,wherein the correction circuit includes;

    a correction amount generator connected to an output of the first filter, the correction amount generator including a second filter having a clock input;

    a correction amount memory connected to an output of the correction amount generator; and

    a correction section connected to the output of the first filter and an output of the correction amount memory, the correction section correcting an output value of the first filter based on a correction amount stored in the correction amount memory, andwherein the clock selector is connected to the clock input for selecting the second clock at a time of starting correction, and selecting the first clock after a predetermined time passes from the time of starting correction.

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