CIRCUITS FOR BIASING/CHARGING HIGH IMPEDANCE LOADS
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United States of America Patent
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Issued Date -
Jul 1, 2010
app pub date -
Dec 30, 2009
filing date -
Dec 30, 2008
priority date (Note) -
Abandoned
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Abstract
A charging circuit for charging/biasing high impedance loads such as capacitive loads. The circuit comprises an input for connecting to a voltage/charge source and an output for connecting to the load. A capacitor is connected between the output and a reference voltage such as ground and a reverse bias diode is connected between the input and the output terminals. The reverse bias diode is arranged to allow a reverse current to pass which is sufficient to compensate for current leakage at the output terminal or other parts of the circuit. The reverse bias diode is conveniently a polysilicon diode. The diode may be connected in parallel with a shunt device to allow for rapid charging during start up.
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