Successive approximate capacitance measurement circuit
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United States of America Patent
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Feb 8, 2011
Grant Date -
Mar 20, 2008
app pub date -
Nov 7, 2007
filing date -
Jan 20, 2006
priority date (Note) -
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Abstract
A capacitance measurement circuit includes a current source, a switch, and a comparator. The current source is coupled to drive a current through a circuit node. The switch is coupled to the circuit node to switch the current into a device under test (“DUT”) capacitor. The comparator includes first and second input ports. The comparator is coupled to compare a first voltage received on the first input port against a reference voltage received on the second input port. The first voltage is related to the current driven through the circuit node, a frequency at which the switch is switched, and a capacitance of the DUT capacitor.
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