公开(公告)号：US09749051B2

公开(公告)日：2017-08-29

申请号：US14863862

申请日：2015-09-24

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Hyun Jang ,  Bong Hyuk Park ,  Dong Seung Kwon

IPC: H04B10/25 ,  H04B10/2575

CPC classification number: H04B10/25753 ,  H04B10/25759

Abstract: The present invention relates to a central office device, a remote site device, and a communication method thereof that can be used in a radio over fiber (RoF) technique. Provided are a central office device and a communication method thereof that convert an analog signal into a signal having a carrier with an intermediate frequency and converts the converted signal into a digital signal to transmit the converted digital signal to a remote site device. Provided are a remote site device and a communication method thereof that filter a digital signal having a carrier with an intermediate frequency to easily induce a corresponding analog signal.

公开(公告)号：US10033562B2

公开(公告)日：2018-07-24

申请号：US15460537

申请日：2017-03-16

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Seung Hyun Jang ,  Bong Hyuk Park ,  Hui Dong Lee

IPC: H04L7/04 ,  H04L27/20 ,  H04B1/04 ,  H04L27/12

Abstract: An envelope signal time delay adjustment apparatus includes a negative group delay unit for converting an envelope signal input from a signal generator into an envelope signal having a group delay of a negative value whose frequency increases from a predetermined frequency band; an envelope-tracking modulator for power-amplifying and outputting the envelope signal output from the negative group delay unit; and a frequency limiting unit for limiting a bandwidth of the envelope-tracking modulator to be lower than an original bandwidth of the envelope-tracking modulator.

公开(公告)号：US09729108B2

公开(公告)日：2017-08-08

申请号：US14996809

申请日：2016-01-15

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Hyun Jang ,  Bong Hyuk Park ,  Nam Sik Ryu ,  Dong Seung Kwon

IPC: H03G3/30 ,  H03F1/02 ,  H03F3/19 ,  H03F3/24

CPC classification number: H03F1/0222 ,  H03F3/19 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451 ,  H03G3/30 ,  H03G3/3005

Abstract: Provided is an apparatus for adjusting an envelope signal delay in an envelope-tracking power amplifier. The apparatus includes: an envelope signal providing unit configured to provide an envelope signal; a variable negative group delay unit configured to adjust a group delay of the envelope signal received from the envelope signal providing unit and output the adjusted envelope signal; an envelope modulator configured to modulate the envelope signal outputted from the variable negative group delay unit; a group delay difference detecting unit configured to detect a group delay difference between the envelope signal which is outputted from the envelope signal providing unit and the envelope signal which is outputted from the envelope modulator; and a control signal generating unit configured to generate a control signal to control a group delay value of the variable negative group delay unit according to the group delay difference.

公开(公告)号：US09014281B2

公开(公告)日：2015-04-21

申请号：US14011268

申请日：2013-08-27

Applicant: Electronics and Telecommunications Research Institute

Inventor： Young Kyun Cho ,  Sung Jun Lee ,  Seung Hyun Jang ,  Bong Hyuk Park ,  Jae Ho Jung ,  Kwang Chun Lee

IPC: H04L25/49 ,  H03K7/08 ,  H04B14/06 ,  H03M3/00

CPC classification number: H04L25/4902 ,  H03K7/08 ,  H03M3/504 ,  H04B14/062

Abstract: A delta-sigma modulator and a transmitter apparatus including the same are disclosed. The delta-sigma modulator includes a first integrator, a second integrator, a first comparator configured to compare an output signal of the second integrator and a reference signal, and output a first comparison signal, a second comparator configured to compare the output signal of the second integrator and the reference signal, and output a second comparison signal, a first DAC configured to output the first signal corresponding to the first comparison signal and the second comparison signal, a second DAC configured to output the second signal corresponding to the first comparison signal and the second comparison signal, a delayer configured to generate a delayed signal that delays the first comparison signal and the second comparison signal by a predetermined time, and an output DAC configured to generate an output signal having a multi-level corresponding to the delayed signal.

Abstract translation: 公开了一种Δ-Σ调制器及其发射机装置。 Δ-Σ调制器包括第一积分器，第二积分器，被配置为比较第二积分器的输出信号和参考信号的第一比较器，并输出第一比较信号;第二比较器，被配置为比较第二积分器的输出信号 第二积分器和参考信号，并输出第二比较信号，第一DAC被配置为输出对应于第一比较信号和第二比较信号的第一信号;第二DAC，被配置为输出对应于第一比较信号的第二信号 和第二比较信号，延迟器，被配置为产生将第一比较信号和第二比较信号延迟预定时间的延迟信号;以及输出DAC，被配置为产生具有与延迟信号相对应的多电平的输出信号 。

公开(公告)号：US11205998B2

公开(公告)日：2021-12-21

申请号：US16788177

申请日：2020-02-11

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Sun Woo Kong ,  Kwang Seon Kim ,  Jee Hoon Park ,  Kwang Chun Lee ,  Hui Dong Lee ,  Seung Hyun Jang

IPC: H03F1/22 ,  H03F1/34 ,  H03F3/193 ,  H03F1/56 ,  H03F3/195

Abstract: An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.

公开(公告)号：US10547478B2

公开(公告)日：2020-01-28

申请号：US16226812

申请日：2018-12-20

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Hyun Jang ,  Sun Woo Kong ,  Kwang Seon Kim ,  Myung Don Kim ,  Hui Dong Lee

IPC: H04L25/49 ,  H04B10/508 ,  H03M3/00

Abstract: Disclosed are a method for signal modulation based on pulse density modulation and an apparatus therefore. The method for signal modulation is performed in an apparatus for modulating a signal based on pulse density modulation and includes performing pulse density modulation on an analog signal input to the apparatus through a pulse density modulator of the apparatus, converting a bandwidth of the pulse density modulated signal into a bandwidth required for the apparatus through a correlative encoder of the apparatus, transmitting the bandwidth converted signal to a radio frequency (RF) unit of the apparatus based on an electrical-to-optical (E/O) converter and an optical-to-electrical (O/E) converter of the apparatus, filtering a frequency band of the bandwidth converted signal and outputting the frequency band filtered signal via the RF unit.