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1. 发明授权

US5859570A Frequency synthesizer using divided and frequency converted DDS signal as reference for PLL 失效
标题翻译：频率合成器采用分频和变频DDS信号作为PLL的参考
公开(公告)号：US5859570A
公开(公告)日：1999-01-12
申请号：US910014
申请日：1997-08-12
申请人： Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
发明人： Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
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 , H03L7/06
CPC分类号： H03L7/107 , H03D7/161 , H03L7/1806 , H03L7/23
摘要： A frequency synthesizer having reduced spurious components for use in a receiving and transmitting apparatus. The frequency synthesizer includes a direct digital synthesizer (DDS) for generating a first signal having a first frequency determined by channel setting data. The first signal is applied to a frequency divider to generate a divided signal having a divided frequency. The divided signal is applied to a frequency converter for shifting the divided frequency by a shift frequency interval to provide a reference signal having a reference frequency. The reference signal is applied to a phase locked loop (PLL) for generating a final signal having a predetermined frequency characteristic.
摘要翻译：一种频率合成器，其具有减少的用于接收和发送装置中的杂散分量。频率合成器包括用于产生具有由频道设置数据确定的第一频率的第一信号的直接数字合成器（DDS）。第一信号被施加到分频器以产生具有分频的分频信号。分频信号被施加到频率转换器，用于将分频频率移位移位频率间隔，以提供具有参考频率的参考信号。参考信号被施加到用于产生具有预定频率特性的最终信号的锁相环（PLL）。

2. 发明授权

US6154640A Method and apparatus for communication and signal synthesis 失效
标题翻译：用于通信和信号合成的方法和装置
公开(公告)号：US6154640A
公开(公告)日：2000-11-28
申请号：US532049
申请日：1995-09-21
申请人： Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
发明人： Kenji Itoh , Ken'ichi Tajima , Shuji Nishimura , Akio Iida
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
CPC分类号： H03L7/107 , H03D7/161 , H03L7/1806 , H03L7/23
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.
摘要翻译：在接收和发送装置中，基于频率误差检测电路的数据，控制设置在本地振荡电路中的直接数字合成器的频率，以便减少频率误差。直接数字合成器包括数字运算电路，用于输入指定频率的数据并输出与参考时钟同步的周期信号的振幅值;以及数模转换器，用于将周期信号的振幅值转换为模拟信号。

3. 发明授权

US5801589A Frequency synthesizer which suppresses a spurious 失效
标题翻译：频率合成器抑制杂散
公开(公告)号：US5801589A
公开(公告)日：1998-09-01
申请号：US781519
申请日：1997-01-09
申请人： Kenichi Tajima , Kenji Itoh , Shuji Nishimura , Masayuki Doi , Akio Iida
发明人： Kenichi Tajima , Kenji Itoh , Shuji Nishimura , Masayuki Doi , Akio Iida
IPC分类号： H03B28/00 , H03L7/18 , H03L7/183 , H03L7/00 , H03B27/00
CPC分类号： H03L7/1806
摘要： A variable divider in which a dividing number setting parameter can be set is provided in a reference oscillator. When a frequency setting parameter is selected so that a DDS will not output a spurious at a specified level or at a level higher than the specified level within an output band of an PLL in response to an output frequency from the PLL, both a conversion function setting parameter for a variable divider in the PLL and a dividing number setting parameter for a variable divider in the reference oscillator are adjusted so that the output frequency and the selected frequency setting parameter are satisfied.
摘要翻译：在基准振荡器中设置有可以设定分频数设定参数的可变分频器。当选择频率设定参数时，响应于来自PLL的输出频率，DDS将不会以PLL的输出频带内的指定电平或高于指定电平的电平输出杂散，转换功能对PLL中的可变分频器的设定参数和参考振荡器中的可变分频器的分频数设定参数进行调整，使得输出频率和所选择的频率设定参数得到满足。

4. 发明授权

US5689819A Transmitter-receiver 失效
标题翻译：发射机 - 接收机
公开(公告)号：US5689819A
公开(公告)日：1997-11-18
申请号：US562066
申请日：1995-11-22
申请人： Shuji Nishimura , Kenji Itoh
发明人： Shuji Nishimura , Kenji Itoh
IPC分类号： H04B1/50 , H03D7/16 , H04B1/3822 , H04B15/00 , H04B1/40
CPC分类号： H04B1/40 , H03D7/163
摘要： In a transmitter-receiver having a transmitting circuit and a receiving circuit, the present invention mitigates an interference between the transmitting circuit and the receiving circuit. A quartz-crystal oscillator is provided as a common reference signal source for the local oscillators and the relation among frequencies is determined so that the frequencies such as local oscillating frequencies and intermediate frequencies within the transmitter-receiver do not overlap each other. Interferences between the transmitting circuit and the receiving circuit are mitigated to prevent a characteristic deterioration, spurious radiation, etc. Thereby the transmitter-receiver may be reduced in size and weight. Further, by sharing a quartz-crystal oscillator having a high frequency stability, narrowing of bands in radio channel spacing may be readily achieved.
摘要翻译：在具有发射电路和接收电路的发射机 - 接收机中，本发明减轻了发射电路和接收电路之间的干扰。提供石英振荡器作为本地振荡器的公共参考信号源，并且确定频率之间的关系，使得诸如发射机 - 接收机内的本地振荡频率和中频的频率彼此不重叠。减轻了发射电路和接收电路之间的干扰，以防止特性劣化，杂散辐射等。从而可以减小发射机和接收机的尺寸和重量。此外，通过共享具有高频稳定性的石英晶体振荡器，可以容易地实现无线电信道间隔中的频带变窄。

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