Current-to-frequency converter
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United States of America Patent
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-
Jul 7, 1992
Grant Date -
N/A
app pub date -
Mar 7, 1990
filing date -
Mar 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A current-to-frequency converter 12' (FIG. 3) for use with an accelerometer 10 comprises a storage capacitor 13 which receives the accelerometer current and develops a charging voltage, reset charging means 25 which delivers timed charges to offset the voltage by predetermined amount and voltage sensing means 14' which senses the charging voltage reaching positive or negative thresholds in order to initiate a reset and offsetting the voltage. The polarity of charging voltage at which reset is triggered determines that polarity threshold as being half the magnitude of the offset voltage but the opposite polarity threshold of greater magnitude so that the voltage on the reset capacitor avoids it. If the acceleration current direction changes altering the charging voltage polarity the first reset at this high magnitude threshold existing for that polarity causes it to adopt the lower magnitude of half the reset offset voltage for subsequent resets and the opposite polarity adopt a threshold of the greater magnitude.
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