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公开(公告)号：US08901918B2
公开(公告)日：2014-12-02
申请号：US13735916
申请日：2013-01-07
发明人： Takashi Maruyama
CPC分类号： G01R1/206 , G01R1/30 , G01R31/043
摘要： This load connection state detection circuit includes a PNP type transistor whose emitter is connected to a power source terminal, a NPN type transistor where the emitter thereof is connected to the power source terminal, the collector thereof is connected to the base of the PNP type transistor, and the base thereof is connected to the collector of the PNP type transistor, and a diode inserted between the collector of the PNP type transistor and an external antenna load, wherein the diode is configured to perform temperature compensation for the base voltage of the NPN type transistor and prevent currents from flowing from the external antenna load to the PNP type transistor and the NPN type transistor.
摘要翻译： 该负载连接状态检测电路包括发射极连接到电源端子的PNP型晶体管，其发射极连接到电源端子的NPN型晶体管，其集电极连接到PNP型晶体管的基极 并且其基极连接到PNP型晶体管的集电极，并且插入在PNP型晶体管的集电极和外部天线负载之间的二极管，其中二极管被配置为对NPN的基极电压进行温度补偿 并防止电流从外部天线负载流向PNP型晶体管和NPN型晶体管。
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公开(公告)号：US09945895B2
公开(公告)日：2018-04-17
申请号：US14585412
申请日：2014-12-30
发明人： Takashi Maruyama
CPC分类号： G01R31/026 , G01R27/00 , G01R29/10 , G01R31/04
摘要： An antenna checking circuit includes an antenna-connection-input terminal, a check-request-input terminal, a check-result-output terminal, a switching element having a control end connected to the check-request-input terminal, an input end connected to the antenna-connection-input terminal, and an output end connected to the check-result-output terminal, and a first resistance connected between the check-request-input terminal and the check-result-output terminal. A DC impedance of an antenna between a power supplying point and a ground point is 0Ω, and when a high-level check-request signal is applied to the check-request-input terminal, in a case where the antenna is connected to an antenna-connection terminal, the switching element turns on, and in a case where the antenna is not connected to the antenna-connection terminal, the switching element turns off. Check-result signals that are output to the check-result-output terminal in these cases are different from each other.
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公开(公告)号：US20170214424A1
公开(公告)日：2017-07-27
申请号：US15404715
申请日：2017-01-12
发明人： Takashi Maruyama
IPC分类号： H04B1/3827 , H04B1/40
CPC分类号： H04B1/3827 , H04B1/40 , H04W4/80 , H04W84/12 , H04W88/06
摘要： A second-signal first transmission line operates as an open stub in a state in which a second antenna terminal is open. Therefore, a first signal is attenuated that is transmitted from a branch point between a second-signal first transmission line and a second-signal second transmission line to a second communication unit through a second common transmission line. In a case in which a two-antenna communication module performs communication of the first signal and communication of a second signal at the same time by connecting a shared antenna to a first antenna terminal.
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公开(公告)号：US09748994B2
公开(公告)日：2017-08-29
申请号：US15404715
申请日：2017-01-12
发明人： Takashi Maruyama
CPC分类号： H04B1/3827 , H04B1/40 , H04W4/80 , H04W84/12 , H04W88/06
摘要： A second-signal first transmission line operates as an open stub in a state in which a second antenna terminal is open. Therefore, a first signal is attenuated that is transmitted from a branch point between a second-signal first transmission line and a second-signal second transmission line to a second communication unit through a second common transmission line. In a case in which a two-antenna communication module performs communication of the first signal and communication of a second signal at the same time by connecting a shared antenna to a first antenna terminal.
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