Frequency measuring circuit and resonant pressure sensor type differential pressure/pressure transmitter using the frequency measuring unit
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United States of America Patent
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Dec 27, 2005
Grant Date -
Apr 22, 2004
app pub date -
Sep 5, 2003
filing date -
Oct 22, 2002
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Abstract
A time difference signal having a pulse width corresponding to the time difference between an output of a resonant pressure sensor and a reference clock is prepared. The pulse width of the time difference signal is expanded by a given magnification. Based on a count value obtained by counting the reference clock during the expanded pulse width and a count value obtained by counting the reference clock during one cycle of the output of the resonant pressure sensor or a period which is integer times as long as the one cycle, the output frequency of the resonant pressure sensor is obtained. It is possible to obtain the fast processing and the high resolution without increasing the frequency of the reference clock.
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