发明授权
- 专利标题： Method and apparatus for communication and signal synthesis
- 专利标题（中）： 用于通信和信号合成的方法和装置
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申请号： US532049申请日： 1995-09-21
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公开(公告)号： US6154640A公开(公告)日： 2000-11-28
- 发明人: Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
- 申请人： Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
- 申请人地址： JPX 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： JPX Tokyo
- 优先权： JPX6-235379 19940929
- 主分类号： H03B28/00
- IPC分类号： H03B28/00 ; H03D7/16 ; H03J7/06 ; H03L7/107 ; H03L7/16 ; H03L7/18 ; H03L7/183 ; H03L7/185 ; H03L7/23 ; H04B1/26 ; H04B1/30 ; H04B1/3822 ; H04B1/40 ; H01Q11/12
摘要：
In a receiving and transmitting apparatus, a frequency of a direct digital synthesizer provided in a local oscillating circuit is controlled in order to reduce a frequency error, based on data of a frequency error detecting circuit. The direct digital synthesizer includes a digital operation circuit for inputting data designating the frequency and outputting an amplitude value of a periodic signal synchronous with a reference clock, and digital-analog converter for converting the amplitude value of the periodic signal to an analog signal.
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