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：US20100014866A1

公开(公告)日：2010-01-21

申请号：US12086225

申请日：2006-12-05

申请人： Ho-Yong Kang ,  Hyun-Kyun Choi ,  Quan Le ,  Yool Kwon ,  Bong-Tae Kim ,  Sang-Gug Lee

发明人： Ho-Yong Kang ,  Hyun-Kyun Choi ,  Quan Le ,  Yool Kwon ,  Bong-Tae Kim ,  Sang-Gug Lee

IPC分类号： H04J14/08

CPC分类号： H04B10/6931 ,  H03G3/3084 ,  H04B10/66

摘要： A transimpedance amplifier for a burst mode optical communication converts a burst current signal into differential output voltage signals. Using a multi-level digital AGC mechanism, the transimpedance amplifier is rapidly adapted to a burst signal whose amplitude varies in a wide range. By using an adaptive level detection method, a multi-level digital AGC can be implemented without using ADC. In addition, because the transimpedance amplifier uses a selective reset generation scheme that performs a reset operation for itself after a high power burst, a burst mode operation can be performed without external reset signals. Accordingly, the transimpedance amplifier can be integrated with an optical detector within a TO-can. Furthermore, the transimpedance amplifier can have the burst mode capability and the best sensitivity.

摘要翻译： 用于突发模式光通信的跨阻放大器将突发电流信号转换成差分输出电压信号。 使用多电平数字AGC机制，跨阻放大器快速适应幅度在宽范围内变化的脉冲串信号。 通过使用自适应电平检测方法，可以在不使用ADC的情况下实现多电平数字AGC。 此外，由于跨阻抗放大器使用在高功率突发之后对其自身执行复位操作的选择性复位产生方案，所以可以在没有外部复位信号的情况下执行突发模式操作。 因此，跨阻放大器可以与TO-can内的光学检测器集成。 此外，跨阻放大器可以具有突发模式能力和最佳灵敏度。

公开(公告)号：US07536163B2

公开(公告)日：2009-05-19

申请号：US11136363

申请日：2005-05-25

申请人： Min-suk Kang ,  Tuan-anh Phan ,  Eun-chul Park ,  Chun-deok Suh ,  Chang-wam Kim ,  Sang-gug Lee

发明人： Min-suk Kang ,  Tuan-anh Phan ,  Eun-chul Park ,  Chun-deok Suh ,  Chang-wam Kim ,  Sang-gug Lee

IPC分类号： H04B1/26

CPC分类号： H04B1/0032 ,  H04B1/28

摘要： An apparatus and method for converting a frequency of a high frequency signal received from an antenna in an ultra wide band communication system transmitting and receiving using at least two reference frequencies. The method includes generating generation frequencies having frequencies set to convert the frequency of the high frequency signal and mixing the frequency of the high frequency signal and the generation frequencies in at least two stages.

摘要翻译： 一种用于在使用至少两个参考频率发送和接收的超宽带通信系统中转换从天线接收的高频信号的频率的装置和方法。 该方法包括生成具有设定频率的生成频率，以转换高频信号的频率，并且将至少两个阶段的高频信号的频率和生成频率混合。

公开(公告)号：US20090072905A1

公开(公告)日：2009-03-19

申请号：US12210670

申请日：2008-09-15

申请人： Hoang Duong Quoc ,  Eung Ju Kim ,  Sang Gug Lee ,  Jeong Seon Lee ,  Bong Rak Choi ,  Hong Bong Kim

发明人： Hoang Duong Quoc ,  Eung Ju Kim ,  Sang Gug Lee ,  Jeong Seon Lee ,  Bong Rak Choi ,  Hong Bong Kim

IPC分类号： H03F3/45

CPC分类号： H03G7/06 ,  H03G1/0029

摘要： There is provided a variable gain amplifier that is implemented with a CMOS device and has wide band variation and wide bandwidth by a predetermined exponential function. A variable gain amplifier having wide gain variation and wide bandwidth according to an aspect of the invention may include: a differential amplification section differentially amplifying an input signal according to a gain adjustment signal; and a gain adjustment section supplying the gain adjustment signal on the basis of an approximated exponential function determined according to a predetermined bias current, and adjusting a gain of the differential amplification section.

摘要翻译： 提供了一种用CMOS器件实现的可变增益放大器，并且通过预定的指数函数具有宽带变化和宽带宽。 根据本发明的一个方面，具有宽增益变化和宽带宽的可变增益放大器可以包括：差分放大部分，根据增益调整信号对输入信号进行差分放大; 以及增益调整部，其基于根据预定偏置电流确定的近似指数函数提供增益调整信号，并且调整差分放大部分的增益。

公开(公告)号：US07369781B2

公开(公告)日：2008-05-06

申请号：US10705100

申请日：2003-11-10

申请人： Ja Won Seo ,  Ho Yong Kang ,  Hyun Kyun Choi ,  Tae Whan Yoo ,  Hyeong Ho Lee ,  Sang Gug Lee ,  Man Seop Lee

发明人： Ja Won Seo ,  Ho Yong Kang ,  Hyun Kyun Choi ,  Tae Whan Yoo ,  Hyeong Ho Lee ,  Sang Gug Lee ,  Man Seop Lee

IPC分类号： H04B10/06 ,  H03G3/30

CPC分类号： H04B10/693

摘要： Provided is a burst mode optical receiver considering a characteristic of an extinction ratio of a received optical signal is provided. By using a peak detector considering a characteristic of an extinction ratio, top and bottom peak voltages of actual burst packets can be precisely detected while not being affected by a DC offset corresponding to an extinction ratio even though burst packets having a DC offset corresponding to the extinction ratio are received. Accordingly, waveform distortion of a signal output from the burst mode optical receiver can be minimized.

摘要翻译： 提供了考虑接收光信号的消光比特性的突发模式光接收机。 通过使用考虑到消光比特性的峰值检测器，可以精确地检测实际脉冲串分组的顶部和底部峰值电压，而不受与消光比相对应的DC偏移的影响，即使具有对应于 接收消光比。 因此，可以使从突发模式光接收器输出的信号的波形失真最小化。

公开(公告)号：US07319366B2

公开(公告)日：2008-01-15

申请号：US11409886

申请日：2006-04-24

申请人： Nam-Jin Oh ,  Sang-Gug Lee

发明人： Nam-Jin Oh ,  Sang-Gug Lee

IPC分类号： H03B5/12 ,  H03B21/01

CPC分类号： H03B27/00 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243

摘要： A local oscillator without a frequency divider is provided. The local oscillator includes a quadrature voltage controlled oscillator generating I and Q signals having a frequency which is one-third of a local oscillation frequency, and a differential second-harmonic signal having a frequency which is two-thirds of the local oscillation frequency, a poly-phase filter converting the differential second-harmonic signal input from the quadrature voltage controlled oscillator into I and Q signals, and a single side band (SSB) mixer receiving the I and Q signals having the frequency which is one-third of the local oscillation frequency from the quadrature voltage controlled oscillator as an input and receiving the I and Q signals having the frequency which is two-thirds of the local oscillation frequency from the poly-phase filter as an input, and outputting the I and Q signals having the local oscillation frequency.

摘要翻译： 提供了没有分频器的本地振荡器。 本地振荡器包括正交压控振荡器，其生成具有本地振荡频率的三分之一的频率的I和Q信号，以及具有作为本地振荡频率的三分之二的频率的差分二次谐波信号， 将从正交压控振荡器输入的差分二次谐波信号转换为I和Q信号的多相滤波器以及接收具有本地的三分之一频率的I和Q信号的单边带（SSB）混频器 振荡频率作为输入，从作为输入的多相滤波器接收具有作为本地振荡频率的三分之二的频率的I和Q信号，并输出具有 本地振荡频率。

公开(公告)号：US20060170502A1

公开(公告)日：2006-08-03

申请号：US11336788

申请日：2006-01-23

申请人： Choong-Yul Cha ,  Hoon-tae Kim ,  Sang-gug Lee

发明人： Choong-Yul Cha ,  Hoon-tae Kim ,  Sang-gug Lee

IPC分类号： H03F1/22

CPC分类号： H03F3/211 ,  H03F1/223 ,  H03F1/26 ,  H03F1/42 ,  H03F1/483 ,  H03F3/345 ,  H03F2200/294 ,  H03F2200/36 ,  H03F2200/372 ,  H03F2200/39

摘要： A low noise amplifier (LNA) for ultra wide band recives and amplifies identical RF signals in different frequency bands, and includes more than one pair of narrow band LNAs coupled in parallel, and a load circuit which increases load impedance of the entire circuit of the narrow band LNAs. The LNA can not only amplify the RF signal in the UWB but also obtain the low noise and the high gain that are features of the conventional narrow band LNA.

摘要翻译： 用于超宽带的低噪声放大器（LNA）记录并放大不同频带中的相同RF信号，并且包括并联耦合的多于一对窄带LNA以及增加整个电路的负载阻抗的负载电路 窄带LNA。 LNA不仅可以放大UWB中的RF信号，还可以获得作为传统窄带LNA特征的低噪声和高增益。

公开(公告)号：US06605996B2

公开(公告)日：2003-08-12

申请号：US10039542

申请日：2001-12-31

申请人： Hyun Kyu Yu ,  Sang-Gug Lee ,  Mun Yang Park ,  Seong-Do Kim ,  Yong-Sik Youn ,  Seon-Ho Han ,  Nam-Soo Kim

发明人： Hyun Kyu Yu ,  Sang-Gug Lee ,  Mun Yang Park ,  Seong-Do Kim ,  Yong-Sik Youn ,  Seon-Ho Han ,  Nam-Soo Kim

IPC分类号： H03F345

CPC分类号： H03G1/007 ,  H03F3/45179 ,  H03F2203/45492 ,  H03G1/0023

摘要： An automatically gain controllable linear differential amplifier using a variable degeneration resistor is disclosed. The linear differential amplifier includes an input end, a bias current source, a load unit, a first MOS transistor and a second MOS transistor. The linear differential amplifiers of the present invention can control an amplifying gain according to an input signal and improve linearity IIP3 without needing additional power consumption caused by improving the linearity. The automatically gain controllable linear differential amplifier uses NMOS/PMOS transistor so an integration process of the amplifier can be implemented more conveniently and efficiently.

摘要翻译： 公开了一种使用可变退化电阻的自动增益可控线性差分放大器。 线性差分放大器包括输入端，偏置电流源，负载单元，第一MOS晶体管和第二MOS晶体管。 本发明的线性差分放大器可以根据输入信号控制放大增益，并提高线性度IIP3，而不需要通过提高线性度而引起的附加功耗。 自动增益可控线性差分放大器使用NMOS / PMOS晶体管，因此可以更方便，高效地实现放大器的集成过程。

公开(公告)号：US06265908B1

公开(公告)日：2001-07-24

申请号：US09461596

申请日：1999-12-15

申请人： Sang Gug Lee

发明人： Sang Gug Lee

IPC分类号： H03K522

CPC分类号： H03F3/26 ,  H03F3/3432 ,  H03K5/151 ,  H03K5/2409

摘要： A balun circuit capable of operating at low voltages comprises a set of a load resistor, a first and a second transistors connected in series in that order between a supply voltage source and the ground and another set of a load resistor, a third and a fourth transistors connected in series in that order between the supply voltage source and the ground. The emitters of the first and the third transistors are connected to the collectors of the second and the fourth transistors, respectively. The balun circuit further comprises a bias voltage source connected to the bases of the first and the third transistors; a bias current source connected to the bases of the second and the fourth transistors; a first capacitor; an input voltage source coupled to the collector of the second transistor via the first capacitor; and a second capacitor coupled between the base and the collector of the second transistor.

摘要翻译： 能够在低电压下工作的平衡 - 不平衡变换器电路包括一组负载电阻器，第一和第二晶体管，其在电源电压源和地之间以该顺序串联连接，另一组负载电阻器，第三和第四 在电源电压源和地之间依次串联连接的晶体管。 第一和第三晶体管的发射极分别连接到第二和第四晶体管的集电极。 平衡 - 不平衡变换器电路还包括连接到第一和第三晶体管的基极的偏置电压源; 连接到第二和第四晶体管的基极的偏置电流源; 第一电容器; 经由所述第一电容器耦合到所述第二晶体管的集电极的输入电压源; 以及耦合在第二晶体管的基极和集电极之间的第二电容器。