Switched-capacitor circuit having a capacitor array circuit, and analog-to-digital converter using said switched-capacitor circuit
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United States of America Patent
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Jul 17, 2012
Grant Date -
Dec 30, 2010
app pub date -
Jun 29, 2010
filing date -
Jun 30, 2009
priority date (Note) -
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Abstract
A capacitor array circuit receives a plurality of input signals, generate a single output signal by combining the plurality of input signals, and output the single output signal. A comparator receives the output signal of the capacitor array circuit. A current source, which is disposed between a predetermined fixed voltage source and an output terminal of the switched-capacitor circuit, supplies the current to the output terminal until the output signal of the comparator changes. A plurality of input capacitors in the capacitor array circuit receives a plurality of input signals in parallel with each other. At least one additional regulating capacitor in the capacitor array circuit store the charge to compensate for an offset component caused by the delay in the comparator. The respective output terminals of the plurality of input capacitors and the at least one additional regulating capacitor are combined into one.
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