公开(公告)号：US20120105110A1

公开(公告)日：2012-05-03

申请号：US13200024

申请日：2011-09-15

申请人： Yasuo Kitayama ,  Hiroyuki Demura ,  Naoki Onishi

发明人： Yasuo Kitayama ,  Hiroyuki Demura ,  Naoki Onishi

IPC分类号： H03B21/00 ,  H03L7/06

CPC分类号： H03B21/00 ,  H03G1/0058 ,  H03G3/30 ,  H03L5/00

摘要： To provide, in a frequency synthesizer including: a variable attenuator provided at a subsequent stage of a voltage controlled oscillator; a detector; and a control unit outputting a control voltage for adjusting an attenuation amount of the variable attenuator via a digital/analog converter in accordance with a detection voltage, a technology with which a spurious due to a change in an output of the digital/analog converter can be suppressed. A low-pass filter is provided between an output side of a digital/analog converter and a variable attenuator to cut a frequency component corresponding to an overshoot generated when an output of the digital/analog converter is changed. Further, a period of time from when a control unit outputs a control voltage to when it reads a signal level detected by a detector is set to a period of time longer than a time constant of the low-pass filter determined by a cut-off frequency of the low-pass filter so that no influence is exerted on an operation of automatically controlling the signal level.

摘要翻译： 提供一种频率合成器，包括：设置在压控振荡器的后续级的可变衰减器; 检测器 以及控制单元，其根据检测电压输出用于经由数字/模拟转换器调整可变衰减器的衰减量的控制电压，由于数字/模拟转换器的输出的变化引起的寄生的杂散技术 被压制 在数字/模拟转换器的输出侧和可变衰减器之间提供低通滤波器，以便在数字/模拟转换器的输出改变时产生的过冲相应的剪切频率分量。 此外，从控制单元输出控制电压到读取检测器检测到的信号电平的时间段被设置为比由截止器确定的低通滤波器的时间常数更长的时间段 低通滤波器的频率，从而不会对自动控制信号电平的操作产生影响。

公开(公告)号：US08633735B2

公开(公告)日：2014-01-21

申请号：US13200024

申请日：2011-09-15

申请人： Yasuo Kitayama ,  Hiroyuki Demura ,  Naoki Onishi

发明人： Yasuo Kitayama ,  Hiroyuki Demura ,  Naoki Onishi

IPC分类号： H03B21/00

CPC分类号： H03B21/00 ,  H03G1/0058 ,  H03G3/30 ,  H03L5/00

摘要： To provide, in a frequency synthesizer including: a variable attenuator provided at a subsequent stage of a voltage controlled oscillator; a detector; and a control unit outputting a control voltage for adjusting an attenuation amount of the variable attenuator via a digital/analog converter in accordance with a detection voltage, a technology with which a spurious due to a change in an output of the digital/analog converter can be suppressed. A low-pass filter is provided between an output side of a digital/analog converter and a variable attenuator to cut a frequency component corresponding to an overshoot generated when an output of the digital/analog converter is changed. Further, a period of time from when a control unit outputs a control voltage to when it reads a signal level detected by a detector is set to a period of time longer than a time constant of the low-pass filter determined by a cut-off frequency of the low-pass filter so that no influence is exerted on an operation of automatically controlling the signal level.

摘要翻译： 提供一种频率合成器，包括：设置在压控振荡器的后续级的可变衰减器; 检测器 以及控制单元，其根据检测电压输出用于经由数字/模拟转换器调整可变衰减器的衰减量的控制电压，由于数字/模拟转换器的输出的变化引起的寄生的杂散技术 被压制 在数字/模拟转换器的输出侧和可变衰减器之间提供低通滤波器，以便在数字/模拟转换器的输出改变时产生的过冲相应的剪切频率分量。 此外，从控制单元输出控制电压到读取检测器检测到的信号电平的时间段被设置为比由截止器确定的低通滤波器的时间常数更长的时间段 低通滤波器的频率，从而不会对自动控制信号电平的操作产生影响。

公开(公告)号：US20100308929A1

公开(公告)日：2010-12-09

申请号：US12801421

申请日：2010-06-08

申请人： Yasuo Kitayama ,  Hiroyuki Demura

发明人： Yasuo Kitayama ,  Hiroyuki Demura

IPC分类号： H03B5/12

CPC分类号： H03B5/1231 ,  H03B5/1203 ,  H03B5/1237

摘要： A low noise voltage-controlled oscillating circuit which can remove a power source noise to improve low frequency noise characteristics is disclosed. A capacitor C11 is provided between a base of a driving transistor Q1 and GND, whereby a low frequency noise input into the base can be removed. As the driving transistor Q1, a transistor having a low hFE is used, whereby the low frequency noise input from a power source can be removed. A coil L3 is provided on the emitter side of an oscillating transistor Q2, whereby broadband frequency characteristics can be obtained to improve phase noise frequency characteristics. On the emitter side of the oscillating transistor Q2, a resonance frequency in a resonant circuit having a capacitor C7 and the coil L3 is set near the center of a VCO oscillation frequency band, whereby it is possible to obtain the oscillation frequency which is not easily influenced by the noise.

摘要翻译： 公开了一种能够消除电源噪声以改善低频噪声特性的低噪声压控振荡电路。 电容器C11设置在驱动晶体管Q1和GND的基极之间，从而可以去除输入到基极的低频噪声。 作为驱动晶体管Q1，使用具有低hFE的晶体管，由此能够去除从电源输入的低频噪声。 在振荡晶体管Q2的发射极侧设置有线圈L3，由此能够获得宽带频率特性以提高相位噪声频率特性。 在振荡晶体管Q2的发射极侧，具有电容器C7和线圈L3的谐振电路中的谐振频率设定在VCO振荡频带的中心附近，由此可以获得不容易的振荡频率 受噪音影响。

公开(公告)号：US08149069B2

公开(公告)日：2012-04-03

申请号：US12801421

申请日：2010-06-08

申请人： Yasuo Kitayama ,  Hiroyuki Demura

发明人： Yasuo Kitayama ,  Hiroyuki Demura

IPC分类号： H03B5/08

CPC分类号： H03B5/1231 ,  H03B5/1203 ,  H03B5/1237

摘要： A low noise voltage-controlled oscillating circuit which can remove a power source noise to improve low frequency noise characteristics is disclosed. A capacitor C11 is provided between a base of a driving transistor Q1 and GND, whereby a low frequency noise input into the base can be removed. As the driving transistor Q1, a transistor having a low hFE is used, whereby the low frequency noise input from a power source can be removed. A coil L3 is provided on the emitter side of an oscillating transistor Q2, whereby broadband frequency characteristics can be obtained to improve phase noise frequency characteristics. On the emitter side of the oscillating transistor Q2, a resonance frequency in a resonant circuit having a capacitor C7 and the coil L3 is set near the center of a VCO oscillation frequency band, whereby it is possible to obtain the oscillation frequency which is not easily influenced by the noise.

摘要翻译： 公开了一种能够消除电源噪声以改善低频噪声特性的低噪声压控振荡电路。 电容器C11设置在驱动晶体管Q1和GND的基极之间，从而可以去除输入到基极的低频噪声。 作为驱动晶体管Q1，使用具有低hFE的晶体管，由此能够去除从电源输入的低频噪声。 在振荡晶体管Q2的发射极侧设置有线圈L3，由此能够获得宽带频率特性以提高相位噪声频率特性。 在振荡晶体管Q2的发射极侧，具有电容器C7和线圈L3的谐振电路中的谐振频率设定在VCO振荡频带的中心附近，由此可以获得不容易的振荡频率 受噪音影响。