Frequency measuring circuit and resonant pressure sensor...

Details Frequency measuring circuit and resonant pressure sensor... Frequency measuring circuit and resonant pressure sensor...

2005-12-27

2005-12-27

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C324S076410

Reexamination Certificate

active

06979995

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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