发明名称 |
SWITCHED-CAPACITOR FILTER HAVING DIGITALLY-PROGRAMMABLE CAPACITIVE ELEMENT |
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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申请公布号 |
US4769563(A) |
申请公布日期 |
1988.09.06 |
申请号 |
US19860851805 |
申请日期 |
1986.04.14 |
申请人 |
CRYSTAL SEMICONDUCTOR CORPORATION |
发明人 |
DOUGLAS R. HOLBERG;ERIC J. SWANSON |
分类号 |
H03H19/00;(IPC1-7):H03H15/02;H03H9/64 |
主分类号 |
H03H19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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