公开(公告)号：US20080131114A1

公开(公告)日：2008-06-05

申请号：US11929849

申请日：2007-10-30

申请人： Seung-Hyun JANG ,  Chul-Soo LEE ,  Eui Suk JUNG ,  Byoung Whi KIM

发明人： Seung-Hyun JANG ,  Chul-Soo LEE ,  Eui Suk JUNG ,  Byoung Whi KIM

IPC分类号： H04B10/08 ,  H04B17/00 ,  H04J14/02

CPC分类号： H04J14/0226 ,  H04B10/0771 ,  H04B2210/074 ,  H04J14/0227 ,  H04J14/0238 ,  H04J14/0246 ,  H04J14/0282 ,  H04J14/0298

摘要： Provided are a fault localization apparatus based on an optical communication network and a method thereof. In the fault localization apparatus according to the present invention, a downstream light source is used as a monitoring optical signal instead of using an additional monitoring light source and a subcarrier multiplexing (SCM) monitoring pulse signal of a certain frequency band having no interference with a frequency band of a downstream data signal is used and thus a fault position may be detected at low cost.

摘要翻译： 提供一种基于光通信网络的故障定位装置及其方法。 在根据本发明的故障定位装置中，使用下行光源作为监视光信号，而不是使用附加监视光源和不干扰某一频带的某个频带的副载波复用（SCM）监视脉冲信号 使用下行数据信号的频带，因此可以以低成本检测故障位置。

公开(公告)号：US20090102571A1

公开(公告)日：2009-04-23

申请号：US12193204

申请日：2008-08-18

申请人： Bong-Hyuk PARK ,  Seung-Sik LEE ,  Seung-Hyun JANG ,  Sang-Sung CHOI

发明人： Bong-Hyuk PARK ,  Seung-Sik LEE ,  Seung-Hyun JANG ,  Sang-Sung CHOI

IPC分类号： H03B5/12 ,  H03F3/16 ,  H03F3/68

CPC分类号： H03F1/223 ,  H03B5/1212 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243 ,  H03F1/26 ,  H03F3/19 ,  H03F2200/108 ,  H03F2200/372 ,  H03F2200/451

摘要： Provided is a differential cascode voltage-controlled oscillator that can reduce a phase noise by the use of a quality factor enhancement technique with negative conductance and can mitigate a ground-caused noise effect by the use of a cascode connection technique. The differential cascode voltage-controlled oscillator includes an AC signal generator, and first through fourth cascode amplifiers. The AC signal generator generates an AC signal with a certain frequency according to a control voltage. The first cascode amplifier is connected in a cascode configuration, and amplifies the AC signal to output the resulting signal to a first output terminal. The second cascode amplifier is connected in a cascode configuration and connected to the first cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to a second output terminal. The third cascode amplifier is connected in a cascode configuration to amplify the AC signal to output the resulting signal to the first output terminal. The fourth cascode amplifier is connected in a cascode configuration and connected to the third cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to the second output terminal. Herein, the first and second cascode amplifiers and the third and fourth cascode amplifiers are symmetrically connected to differentially amplify the AC signal.

摘要翻译： 提供了一种差分共源共栅压控振荡器，其可以通过使用具有负电导的品质因子增强技术来减少相位噪声，并且可以通过使用共源共栅连接技术来减轻地面引起的噪声影响。 差分共源共栅压控振荡器包括AC信号发生器和第一至第四共源共栅放大器。 交流信号发生器根据控制电压产生一定频率的交流信号。 第一共源共栅放大器以共源共极配置连接，并且放大AC信号以将得到的信号输出到第一输出端。 第二级联放大器以共源共栅配置连接并且以交叉耦合配置连接到第一共源共栅放大器，以放大AC信号以将所得到的信号输出到第二输出端子。 第三共源共栅放大器以共源共极配置连接以放大AC信号，以将结果信号输出到第一输出端。 第四共源共栅放大器以共源共极配置连接并以交叉耦合配置连接到第三共源共栅放大器，以放大AC信号以将结果信号输出到第二输出端。 这里，第一和第二共源共栅放大器和第三和第四共源共栅放大器对称地连接以差分放大AC信号。