Switched capacitor circuit compensation apparatus and method
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United States of America Patent
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Jul 25, 2006
Grant Date -
Jun 30, 2005
app pub date -
Dec 24, 2003
filing date -
Dec 24, 2003
priority date (Note) -
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Abstract
A compensated switched capacitor circuit comprises a switched capacitor circuit and a compensation circuit. The compensation circuit generates a reference current that varies under closed loop control to maintain a targeted slew rate for charging a reference capacitor that is determined by the input clock frequency. The switched capacitor circuit's output amplifier is configured such that its output current varies in proportion to the reference current. Thus, by configuring the reference capacitor to track the effective capacitance of the switched capacitor circuit, the settling time of the switched capacitor circuit may be made relatively insensitive to the value of and changes in the effective capacitance over a range of clock frequencies. The compensation circuit may include a clock reconditioning circuit to ensure that the switched capacitor circuit is clocked at a desired duty cycle.
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