公开(公告)号：US08274317B2

公开(公告)日：2012-09-25

申请号：US12882132

申请日：2010-09-14

申请人： Sang Hyun Cho ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Seung Tak Ryu

发明人： Sang Hyun Cho ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Seung Tak Ryu

IPC分类号： H03L7/06

CPC分类号： H03L7/0995 ,  H03L7/099 ,  H03L2207/06

摘要： A phase-locked loop (PLL) circuit including a voltage-controlled oscillator (VCO) with a variable gain is provided. A phase frequency detector (PFD) detects a phase difference between a reference signal and a PLL feedback signal. A charge pump and a loop filter sequentially process an output signal of the PFD. A VCO has different gains according to a mode transition. A control voltage applied to the VCO is selected from an output signal of the loop filter and an additional control signal according to the mode transition.

摘要翻译： 提供了包括具有可变增益的压控振荡器（VCO）的锁相环（PLL）电路。 相位频率检测器（PFD）检测参考信号和PLL反馈信号之间的相位差。 电荷泵和环路滤波器依次处理PFD的输出信号。 根据模式转换，VCO具有不同的增益。 根据模式转换，从环路滤波器的输出信号和附加控制信号中选择施加到VCO的控制电压。

公开(公告)号：US20110148485A1

公开(公告)日：2011-06-23

申请号：US12882132

申请日：2010-09-14

申请人： Sang Hyun CHO ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Seung Tak Ryu

发明人： Sang Hyun CHO ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Seung Tak Ryu

IPC分类号： H03L7/06

CPC分类号： H03L7/0995 ,  H03L7/099 ,  H03L2207/06

摘要： A phase-locked loop (PLL) circuit including a voltage-controlled oscillator (VCO) with a variable gain is provided. A phase frequency detector (PFD) detects a phase difference between a reference signal and a PLL feedback signal. A charge pump and a loop filter sequentially process an output signal of the PFD. A VCO has different gains according to a mode transition. A control voltage applied to the VCO is selected from an output signal of the loop filter and an additional control signal according to the mode transition.

摘要翻译： 提供了包括具有可变增益的压控振荡器（VCO）的锁相环（PLL）电路。 相位频率检测器（PFD）检测参考信号和PLL反馈信号之间的相位差。 电荷泵和环路滤波器依次处理PFD的输出信号。 根据模式转换，VCO具有不同的增益。 根据模式转换，从环路滤波器的输出信号和附加控制信号中选择施加到VCO的控制电压。

公开(公告)号：US08350608B2

公开(公告)日：2013-01-08

申请号：US12976449

申请日：2010-12-22

申请人： Hui Dong Lee ,  Seok Ju Yun ,  Kwi Dong Kim ,  Jong-Kee Kwon ,  Sang-Hyun Cho

发明人： Hui Dong Lee ,  Seok Ju Yun ,  Kwi Dong Kim ,  Jong-Kee Kwon ,  Sang-Hyun Cho

IPC分类号： H03L7/06

CPC分类号： H03L7/083 ,  H03J2200/10 ,  H03L7/0891 ,  H03L7/0995 ,  H03L7/187

摘要： Provided is a PLL circuit including automatic frequency control circuit and an operating method thereof. The voltage controlled oscillator is primarily controlled by an automatic frequency control circuit, and is secondarily controlled by a loop filter. The voltage controlled oscillator outputs a coarsely-tuned oscillation signal when primarily controlled, and outputs a finely-tuned oscillation signal when secondarily controlled. The PLL circuit can have a quick frequency fixing time, and output the oscillation signal having a broad and stable frequency. Moreover, the noise characteristic of the PLL circuit is enhanced.

摘要翻译： 提供一种包括自动频率控制电路的PLL电路及其操作方法。 压控振荡器主要由自动频率控制电路控制，二次由环路滤波器控制。 压控振荡器在主要受控时输出粗调谐振荡信号，并在二次控制时输出微调振荡信号。 PLL电路可以具有快速的频率固定时间，并输出具有宽而稳定频率的振荡信号。 此外，提高了PLL电路的噪声特性。

公开(公告)号：US08446194B2

公开(公告)日：2013-05-21

申请号：US13275753

申请日：2011-10-18

申请人： Seok Ju Yun ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong-Kee Kwon

发明人： Seok Ju Yun ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong-Kee Kwon

IPC分类号： H03L7/06

CPC分类号： H03L7/1976 ,  H03L7/0891

摘要： Provided is a spread spectrum clock generating circuit. The spread spectrum clock generating circuit includes: a phase detector receiving a reference frequency signal from the external and detecting a phase difference between the reference frequency signal and a frequency-divided signal; a voltage controlled oscillator outputting an oscillation signal corresponding to a detection result of the phase detector; a main divider generating the frequency-divided signal by dividing a frequency of the oscillation signal by a main dividing ratio; and a dividing ratio controller generating a variable count value, generating a sub dividing ratio by performing delta-sigma modulation according to the count value, and adjusting the main dividing ratio according to the sub dividing ratio.

摘要翻译： 提供了一种扩频时钟发生电路。 扩频时钟发生电路包括：相位检测器，从外部接收参考频率信号，并检测参考频率信号与分频信号之间的相位差; 输出与所述相位检测器的检测结果对应的振荡信号的压控振荡器; 主分压器，通过将振荡信号的频率除以主分频比来产生分频信号; 以及产生可变计数值的分频比控制器，通过根据计数值进行Δ-Σ调制而产生分分割比，并根据分分割比调节主分频比。

公开(公告)号：US20120105114A1

公开(公告)日：2012-05-03

申请号：US13275753

申请日：2011-10-18

申请人： Seok Ju YUN ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong-Kee Kwon

发明人： Seok Ju YUN ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong-Kee Kwon

IPC分类号： H03L7/06

CPC分类号： H03L7/1976 ,  H03L7/0891

摘要： Provided is a spread spectrum clock generating circuit. The spread spectrum clock generating circuit includes: a phase detector receiving a reference frequency signal from the external and detecting a phase difference between the reference frequency signal and a frequency-divided signal; a voltage controlled oscillator outputting an oscillation signal corresponding to a detection result of the phase detector; a main divider generating the frequency-divided signal by dividing a frequency of the oscillation signal by a main dividing ratio; and a dividing ratio controller generating a variable count value, generating a sub dividing ratio by performing delta-sigma modulation according to the count value, and adjusting the main dividing ratio according to the sub dividing ratio.

摘要翻译： 提供了一种扩频时钟发生电路。 扩频时钟发生电路包括：相位检测器，从外部接收参考频率信号，并检测参考频率信号与分频信号之间的相位差; 输出与所述相位检测器的检测结果对应的振荡信号的压控振荡器; 主分压器，通过将振荡信号的频率除以主分频比来产生分频信号; 以及产生可变计数值的分频比控制器，通过根据计数值进行Δ-Σ调制而产生分分割比，并根据分分割比调节主分频比。

公开(公告)号：US08081038B2

公开(公告)日：2011-12-20

申请号：US12507687

申请日：2009-07-22

申请人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

发明人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

IPC分类号： H03K3/03

CPC分类号： H03K3/0322 ,  H03K2005/00045 ,  H03K2005/00058 ,  H03L7/0995

摘要： Provided is a ring oscillator having an extended range of oscillation frequency by varactors coupled to delay cells even in a simple structure. The wide frequency range results from simply varying an oscillation frequency by control signals applied to the varactors. Since additional switches connected to the delay cells contribute to increase or decrease of the oscillation frequency range, the ring oscillator can conveniently be employed in various types of oscillation systems.

摘要翻译： 提供一种环形振荡器，即使在简单的结构中，也可以通过连接到延迟单元的变容二极管具有扩展的振荡频率范围。 宽频率范围是通过施加到变容二极管的控制信号简单地改变振荡频率。 由于连接到延迟单元的附加开关有助于振荡频率范围的增加或减少，因此环形振荡器可以方便地用于各种类型的振荡系统。

公开(公告)号：US20100156542A1

公开(公告)日：2010-06-24

申请号：US12561910

申请日：2009-09-17

申请人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Jong Pil Hong ,  Sang Gug Lee

发明人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Jong Pil Hong ,  Sang Gug Lee

IPC分类号： H03L7/08

CPC分类号： H03L7/0891 ,  H03L5/00 ,  H03L7/099

摘要： Provided is a low voltage frequency synthesizer using a boosting method for a power supply voltage of a charge pump. The low voltage frequency synthesizer includes a phase/frequency detector (PFD) that receives and compares a reference frequency and a feedback frequency to output a comparison signal, a charge pump that receives the comparison signal to output a current corresponding to the comparison signal, a low-pass filter (LPF) that generates a voltage corresponding to the output current of the charge pump, a voltage controlled oscillator (VCO) that receives the voltage of the LPF, amplifies the voltage to generate a boosting voltage, and outputs a frequency corresponding to the received voltage, and a DC converter that receives the boosting voltage of the VCO, converts the boosting voltage into a DC voltage, and applies the DC voltage as a power supply voltage of the charge pump. Since the supply voltage of the charge pump is provided from the LC-circuit-based VCO, the frequency synthesizer has superior characteristics such as a wide locking range, low phase noise, and the prevention of performance degradation caused by an external environment or process variations.

摘要翻译： 提供了使用电荷泵的电源电压的升压方法的低压频率合成器。 所述低电压频率合成器包括接收比较参考频率和反馈频率以输出比较信号的相位/频率检测器（PFD），接收比较信号以输出与比较信号相对应的电流的电荷泵， 产生与电荷泵的输出电流相对应的电压的低通滤波器（LPF），接收LPF电压的压控振荡器（VCO），放大电压以产生升压电压，并输出对应的频率 以及接收VCO的升压电压的DC转换器，将升压电压转换成直流电压，并施加直流电压作为电荷泵的电源电压。 由于电荷泵的电源电压是从基于LC电路的VCO提供的，因此频率合成器具有优异的特性，例如宽锁定范围，低相位噪声，以及防止由外部环境或工艺变化引起的性能下降 。

公开(公告)号：US08264293B2

公开(公告)日：2012-09-11

申请号：US12844686

申请日：2010-07-27

申请人： Seok Ju Yun ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

发明人： Seok Ju Yun ,  Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

IPC分类号： H03B5/08

CPC分类号： H03B5/1228 ,  H03B5/1215 ,  H03B5/1218 ,  H03B5/1225 ,  H03B5/1253 ,  H03B5/1296

摘要： Provided is a transformer-based oscillator which is suited to oscillate frequencies in multiple bands. An oscillator includes a transformer resonance unit and a plurality of complementary transistors. The transformer resonance unit includes a primary coil and a secondary coil corresponding to the primary coil. The plurality of complementary transistors have gates and drains between which both ends of the transformer resonance unit are respectively connected. Thus, the oscillator may operate in a differential mode or common mode according to the phase of the transformer resonance unit. Also, a complementary transistor constituting a multiband oscillation loop may be independently connected to both ends of the transformer resonance unit, and an oscillation loop of at least one band may be selected out of a multiband oscillation loop using a switch unit. Thus, the oscillator may be suited to oscillate resonance frequencies in multiple bands.

摘要翻译： 提供了一种适用于在多个频带中振荡频率的基于变压器的振荡器。 振荡器包括变压器谐振单元和多个互补晶体管。 变压器谐振单元包括初级线圈和对应于初级线圈的次级线圈。 多个互补晶体管具有分别连接变压器谐振单元的两端的栅极和漏极。 因此，振荡器可以根据变压器谐振单元的相位以差模或共模工作。 此外，构成多频带振荡回路的互补晶体管可以独立地连接到变压器谐振单元的两端，并且可以使用开关单元从多频带振荡回路中选择至少一个频带的振荡回路。 因此，振荡器可以适合于振荡多个频带中的谐振频率。

公开(公告)号：US20110148534A1

公开(公告)日：2011-06-23

申请号：US12878697

申请日：2010-09-09

申请人： Hui Dong LEE ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Jong Dae Kim

发明人： Hui Dong LEE ,  Kwi Dong Kim ,  Jong Kee Kwon ,  Jong Dae Kim

IPC分类号： H03B5/12

CPC分类号： H03B5/1228 ,  H03B5/1215 ,  H03B5/124 ,  H03B5/1265 ,  H03B5/1293

摘要： An LC voltage-controlled oscillator (VCO) is provided. The LC VCO includes an LC resonant circuit including at least one inductor whose both terminals are connected to output nodes and at least one capacitor connected in parallel with the inductor, and an amplifier circuit including at least one pair of switching transistors. Here, drains of the pair of switching transistors are connected to the output nodes respectively, and gates of the switching transistors are connected with the drains through a variable capacitance block exhibiting different characteristics according to an input signal.

摘要翻译： 提供了一个LC压控振荡器（VCO）。 LC VCO包括LC谐振电路，其包括至少一个电感器，其两个端子连接到输出节点和与电感器并联连接的至少一个电容器，以及包括至少一对开关晶体管的放大器电路。 这里，一对开关晶体管的漏极分别连接到输出节点，并且开关晶体管的栅极通过根据输入信号呈现不同特性的可变电容块与漏极连接。

公开(公告)号：US20100156544A1

公开(公告)日：2010-06-24

申请号：US12507687

申请日：2009-07-22

申请人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

发明人： Hui Dong Lee ,  Kwi Dong Kim ,  Jong Kee Kwon

IPC分类号： H03K3/03

CPC分类号： H03K3/0322 ,  H03K2005/00045 ,  H03K2005/00058 ,  H03L7/0995

摘要： Provided is a ring oscillator having an extended range of oscillation frequency by varactors coupled to delay cells even in a simple structure. The wide frequency range results from simply varying an oscillation frequency by control signals applied to the varactors. Since additional switches connected to the delay cells contribute to increase or decrease of the oscillation frequency range, the ring oscillator can conveniently be employed in various types of oscillation systems.

摘要翻译： 提供一种环形振荡器，即使在简单的结构中，也可以通过连接到延迟单元的变容二极管具有扩展的振荡频率范围。 宽频率范围是通过施加到变容二极管的控制信号简单地改变振荡频率。 由于连接到延迟单元的附加开关有助于振荡频率范围的增加或减少，因此环形振荡器可以方便地用于各种类型的振荡系统。