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1. 发明申请

US20120139654A1 FREQUENCY SYNTHESIZER 审中-公开
标题翻译：频率合成器
公开(公告)号：US20120139654A1
公开(公告)日：2012-06-07
申请号：US13371138
申请日：2012-02-10
申请人： Atsushi OHARA , Hidetoshi YAMASAKI
发明人： Atsushi OHARA , Hidetoshi YAMASAKI
IPC分类号： H03J7/04
CPC分类号： H03L7/099 , H03L7/093 , H03L7/1075 , H03L7/18 , H03L2207/50
摘要： A frequency synthesizer includes a control circuit configured to generate a digital control signal; and a digitally controlled oscillator of which oscillation frequency changes according to the generated digital control signal. The control circuit includes an operational circuit configured to divide an integer portion of a numerical value representing a phase difference between a reference signal and an oscillation frequency signal of the digitally controlled oscillator into high-order bits and low-order bits including a redundant bit as an MSB, and two encoders configured to encode the high-order bits and the low-order bits to generate control signals. The digitally controlled oscillator includes two capacitive element groups having capacitance values controlled by the control signals. The oscillation frequency of the digitally controlled oscillator changes according to a total capacitance value of the two capacitive element groups.
摘要翻译：频率合成器包括配置成产生数字控制信号的控制电路; 以及数字控制振荡器，其振荡频率根据所生成的数字控制信号而改变。控制电路包括：运算电路，被配置为将表示数字控制振荡器的参考信号和振荡频率信号之间的相位差的数值的整数部分分成高位和低位，包括冗余位 MSB和两个编码器，被配置为对高阶位和低位进行编码以产生控制信号。数字控制振荡器包括具有由控制信号控制的电容值的两个电容元件组。数字控制振荡器的振荡频率根据两个电容元件组的总电容值而变化。

2. 发明申请

US20100066416A1 DIGITALLY-CONTROLLED OSCILLATOR, FREQUENCY SYNTHESIZER AND RADIO COMMUNICATION DEVICE 有权
标题翻译：数字控制振荡器，频率合成器和无线电通信设备
公开(公告)号：US20100066416A1
公开(公告)日：2010-03-18
申请号：US12536120
申请日：2009-08-05
申请人： Atsushi OHARA , Shinichiro Uemura , Hisashi Adachi
发明人： Atsushi OHARA , Shinichiro Uemura , Hisashi Adachi
IPC分类号： H03L7/00
CPC分类号： H03L7/18 , H03L7/085 , H03L7/093 , H03L7/099 , H03L7/0995 , H03L7/10 , H03L2207/06 , H03L2207/50
摘要： A frequency synthesizer includes a digitally-controlled oscillator and an oscillation frequency control unit. The digitally-controlled oscillator includes a loop-shaped transmission line path having an odd number of parallel portions in each of which two conductors are arranged in parallel to each other with a space therebetween, and an odd number of intersection portions in each of which two conductors intersect spatially, an active circuit coupled between the two conductors, and a first variable capacitance unit and a second variable capacitance unit. The oscillation frequency control unit includes a ΣΔ modulation circuit for subjecting to ΣΔ modulation a first control signal for switching a high capacitance state and a low capacitance state of a first variable capacitance element included in the first variable capacitance unit.
摘要翻译：频率合成器包括数字控制振荡器和振荡频率控制单元。数字控制振荡器包括具有奇数个并行部分的环形传输线路径，其中每个平行部分中的两个导体彼此平行布置，并且其间具有空格，奇数个交点部分导体在空间上相交，耦合在两个导体之间的有源电路，以及第一可变电容单元和第二可变电容单元。振荡频率控制单元包括＆Sgr＆amp; Dgr; 调制电路用于＆Sgr＆amp; Dgr; 调制用于切换包括在第一可变电容单元中的第一可变电容元件的高电容状态和低电容状态的第一控制信号。

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