Small current detector circuit and locator device using the same
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United States of America Patent
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Jun 13, 2000
Grant Date -
N/A
app pub date -
Nov 13, 1997
filing date -
Nov 15, 1996
priority date (Note) -
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Abstract
The improved small current detector circuit and locator device each include a first and a second capacitor, a pulse drive circuit which drives one terminal of each capacitor by a pulse signal and charges and discharges the capacitors in synchronism with the rise and fall of the applied pulse so as to generate a first and a second detection signal at the other terminal of each capacitor. A current generator circuit receives the first and second detection signals and generates a current representing the difference between the levels of said signals. An integrator circuit integrates the output current from the current generator circuit. At least one of the first capacitor or second capacitor is provided in a detection portion of the detector circuit or locator device.
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