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公开(公告)号：US07171178B2
公开(公告)日：2007-01-30
申请号：US10763441
申请日：2004-01-23
IPC分类号： H04B1/16
CPC分类号： G06K19/0723
摘要： A tuning circuit having an amplitude-varying function is disclosed that comprises a coil, a capacitor, and a resistance-adjusting element connected in parallel to the coil and the capacitor for varying resistance at time of resonance of the tuning circuit, wherein the amplitude of an output signal of the tuning circuit is varied by varying the resistance with the resistance-adjusting element.
摘要翻译： 公开了一种具有振幅变化功能的调谐电路，其包括与线圈和电容器并联连接的线圈，电容器和电阻器，用于在调谐电路的谐振时改变电阻，其中振幅 通过用电阻调节元件改变电阻来改变调谐电路的输出信号。
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2.发明授权Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus 失效具有振幅衰减功能的调谐电路和无线电通信装置的集成电路公开(公告)号：US07330708B2
公开(公告)日：2008-02-12
申请号：US11001460
申请日：2004-11-30
IPC分类号： H04B1/18
CPC分类号： B60R25/24 , G06K19/0723 , H03J5/246
摘要： There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resistance-adjustment circuit comprises a series circuit of a resistor and a switching element having an ON-resistance smaller than the resistance of the resistor, and turning on/off the switching element causes the resistance of the tuning circuit when resonant to change.
摘要翻译： 公开了一种具有线圈的调谐电路，并且电容器包括与线圈和电容器并联连接的电阻调节电路。 电阻调节电路在谐振时改变调谐电路的电阻。 电阻调节电路包括电阻器和具有比电阻器的电阻小的导通电阻的开关元件的串联电路，并且开关元件的导通/截止使谐振时的调谐电路的电阻发生变化。
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3.发明申请Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus 失效具有振幅衰减功能的调谐电路和无线电通信装置的集成电路公开(公告)号：US20050147193A1
公开(公告)日：2005-07-07
申请号：US11001460
申请日：2004-11-30
CPC分类号： B60R25/24 , G06K19/0723 , H03J5/246
摘要： There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resistance-adjustment circuit comprises a series circuit of a resistor and a switching element having an ON-resistance smaller than the resistance of the resistor, and turning on/off the switching element causes the resistance of the tuning circuit when resonant to change.
摘要翻译： 公开了一种具有线圈的调谐电路，并且电容器包括与线圈和电容器并联连接的电阻调节电路。 电阻调节电路在谐振时改变调谐电路的电阻。 电阻调节电路包括电阻器和具有比电阻器的电阻小的导通电阻的开关元件的串联电路，并且开关元件的导通/截止使谐振时的调谐电路的电阻发生变化。
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