发明名称 |
Method and apparatus for communication and signal synthesis |
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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申请公布号 |
US6154640(A) |
申请公布日期 |
2000.11.28 |
申请号 |
US19950532049 |
申请日期 |
1995.09.21 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
ITOH, KENJI;TAJIMA, KEN'ICHI;NISHIMURA, SHUJI;IIDA, AKIO |
分类号 |
H03B28/00;H03D7/16;H03J7/06;H03L7/107;H03L7/18;H03L7/23;H04B1/26;H04B1/30;H04B1/40;(IPC1-7):H04B1/40;H01Q11/12 |
主分类号 |
H03B28/00 |
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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