Method and circuit for measuring capacitance and capacitance mismatch
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United States of America Patent
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Jan 29, 2008
Grant Date -
Apr 20, 2006
app pub date -
Sep 30, 2004
filing date -
Sep 30, 2004
priority date (Note) -
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Abstract
A circuit and method for measuring capacitance and capacitance mismatch of at least one capacitor pair are provided. The circuit includes a first switch, a second switch, a third switch and a P-type transistor. A terminal of the first switch is connected to a terminal of a first capacitor, and a terminal of the second switch is connected to a terminal of a second capacitor. A terminal of the third switch is connected to another terminal of the first capacitor and another terminal of the second capacitor, and a gate of the P-type transistor is connected to another terminal of the third switch. When the first, second and third switches are turned on, a capacitance of the first capacitor, a capacitance of the second capacitor, or a capacitance mismatch between the first and second capacitances is measured.
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