发明名称 |
Method and apparatus for automatic tuning of a resonant loop antenna |
摘要 |
Disclosed is a circuit and method for continuous automatic tuning of a resonant circuit. A resonance voltage of the resonant circuit is phase shifted by a predetermined phase shift Phi degrees and an input voltage signal to a power amplifier driving the resonant circuit is phase shifted by Phi±90 degrees to place the signals in quadrature. The phase shifted signals are mixed to obtain a error signal. The error signal is compared to a predetermined voltage range in order to generate control signals for a control word generator, such as an up-down counter. The control word generator produces a control word that drives a capacitance bank that is part of the resonant circuit. The present invention continuously automatically adjusts the capacitance of the capacitance bank to tune the resonant circuit.
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申请公布号 |
US7058372(B1) |
申请公布日期 |
2006.06.06 |
申请号 |
US20020286647 |
申请日期 |
2002.11.01 |
申请人 |
INTEGRATION ASSOCIATES INC. |
发明人 |
PARDOEN MATTHIJS D.;ERDELYI JANOS;ZOLOMY ATTILA;MERNYEI FERENC |
分类号 |
H04B1/04;H01Q7/00;H01Q23/00 |
主分类号 |
H04B1/04 |
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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