发明授权
- 专利标题： Wireless terminal device
- 专利标题（中）： 无线终端设备
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申请号： US09694675申请日： 2000-10-24
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公开(公告)号： US07054610B1公开(公告)日： 2006-05-30
- 发明人: Kenji Itoh , Hiroaki Nagano , Takatoshi Katsura , Shinjirou Fukuyama , Mitsuru Mochizuki , Yoshinori Matsunami , Mitsuhiro Shimozawa , Fumio Ishizu , Ryoji Hayashi
- 申请人： Kenji Itoh , Hiroaki Nagano , Takatoshi Katsura , Shinjirou Fukuyama , Mitsuru Mochizuki , Yoshinori Matsunami , Mitsuhiro Shimozawa , Fumio Ishizu , Ryoji Hayashi
- 申请人地址： JP Tokyo
- 专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址： JP Tokyo
- 代理机构： Rothwell, Figg, Ernst & Manbeck, PC
- 优先权： JPPCT/JP99/00830 19990224
- 主分类号： H04B1/30
- IPC分类号： H04B1/30
摘要：
In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring to the I-channel, and another passive low-pass filter is arranged between a mixer for a Q-channel and the base band circuit for removing interference waves of or above a channel next to a channel neighboring to the Q-channel. Since the low-pass filters for removing the interference waves of or above the channel next to the neighboring channel are of a differential type, the circuit scale can be small, and the power consumption is small. Since the interference waves are removed by the passive low-pass filters and the active low-pass filters, only the desired channel can be reliably received.
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