发明名称 |
Active quadrature current reference source |
摘要 |
This reference source provides a current which is of relatively high magnitude and which leads the voltage by substantially 90 DEG . It includes a reference capacitor which is highly stable and pure but of low capacitance, and a power capacitor which has a high capacitance. The capacitors are connected together at one end for coupling to a voltage source. A current comparator compares the currents flowing through the reference capacitor and the power capacitor, and provides a difference signal. A circuit generates a current in response to the difference signal and adds the generated current to the current through the power capacitor resulting in a current having a waveform and phase substantially identical to the reference capacitor current which leads the voltage source voltage by substantially 90 DEG .
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申请公布号 |
US4296369(A) |
申请公布日期 |
1981.10.20 |
申请号 |
US19800138179 |
申请日期 |
1980.04.07 |
申请人 |
CANADIAN PATENTS & DEV. LTD. |
发明人 |
MOORE, WILLIAM J. M.;KUSTERS, NORBERT L.;SO, EDDY |
分类号 |
G01R35/00;G05F1/38;(IPC1-7):G05F1/00;H01F40/06 |
主分类号 |
G01R35/00 |
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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