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SWITCHED-CAPACITOR FILTER HAVING DIGITALLY-PROGRAMMABLE CAPACITIVE ELEMENT
SWITCHED-CAPACITOR FILTER HAVING DIGITALLY-PROGRAMMABLE CAPACITIVE ELEMENT
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机译:具有数字可编程电容元件的开关电容滤波器
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摘要
A method and circuitry for time-sharing a digitally-programmable capacitive element, particularly in conjunction with a switched-capacitor filter circuit. The method includes: selecting a first capacitance value for the capacitive element; initializing the charge on the capacitive element; connecting the capacitive element to first preselected nodes of an electronic circuit; disconnecting the capacitive element from the first preselected nodes of after any charge transfer has substantially been completed; changing the capacitance of the capacitive element to a new desired value; initializing the charge on the capacitive element; and then connecting the capacitive element to other preselected nodes of the electronic circuit. A biquad switched-capacitor filter circuit is configured to use such method in its operation.
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