Charge transfer capacitance measurement circuit
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United States of America Patent
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Oct 15, 2002
Issued Date -
N/A
app pub date -
Sep 7, 1999
filing date -
Nov 25, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
Pulse circuits for measuring the capacitance to ground of a plate may be used in control equipment to provide an indication of the proximity of a person or object to be sensed. Pulse circuits are disclosed that are made from sets of three or more electrical switching elements arranged so that each of the switching elements has one side electrically connected to either a supply voltage or to an electrical ground. These arrangements are compatible with existing integrated circuit fabrication technology. In addition, the circuitry can be configured as a proximity sensing switch that requires only a two wire connection to a host apparatus.
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