Systems for measuring physical quantities
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United States of America Patent
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Oct 28, 2008
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N/A
app pub date -
Jan 19, 2005
filing date -
Jan 20, 2004
priority date (Note) -
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Abstract
It is provided a system for measuring a physical quantity based on a detection signal using a vibrator 1, a self-oscillating circuit 12A oscillating a driving vibration in the vibrator 1 and a detection circuit for outputting a detection signal from the vibrator 1. The self-oscillating circuit 12A comprises a current-voltage converter 3 and a low pass filter 25. The detection circuit comprises a charge amplifier circuit amplifying an output signal from the vibrator, and the current-voltage converter and the charge amplifier circuit are formed in a monolithic IC.
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