• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.842-844
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• 2012

This paper introduces a 5GHz FIR filter low noise amplifier (LNA) based on a distributed amplifier and analyzes the its characteristics. The proposed FIR filter-LNA has the MA(moving average) filter characteristic which improves the frequency selectivity of the amplifier. Proto-type circuits with FR4 and ${\varepsilon}_r=10.2$ PCB have been realized and simulated using ADS (Advanced Design System). The simulation results verified that the designed LNA had a gain of about 10dB and the frequency characteristic of the MA FIR filter. It is expected that the proposed FIR filter LNA can be applicable to the various applications using an amplifier and a filter in RF systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.4A
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• pp.325-329
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• 2007

In this paper, the modem based on EIA-709.2-A PL of powerline communication techniques which are considered to be important technologies for in-home control network systems was implemented via VHDL. In order to have the robust properties against existing noises over powerline channels, the information data using eight symbols was transmitted by transmitter and the receiver is composed of matched filter, averager, decision and detection parts in order to detect the right data from the received signals. The implemented PLC transceiver was downloaded into Altera's EP1S25C672 FPGA and the operation was verified successfully.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.995-998
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• 2005

This paper proposes a new SoC (System-on-Chip)-based automatic compensation circuit (ACC) for 5GHz low noise amplifier (LNA). This circuit is extremely useful for today's RF IC (Radio Frequency Integrated Circuit) devices in a complete RF transceiver environment. The circuit contains RF BIST (Built-ln Self-Test) circuit, Capacitor Mirror Banks (CMB) and digital processing unit (DPU). The ACC automatically adjusts performance of 5GHz LNA by the processor in the SoC transceiver when the LNA goes out of the normal range of operation.

• Journal of Satellite, Information and Communications
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• v.5 no.1
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• pp.17-21
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• 2010

In this paper, we have introduced a new way to design low phase noise PLL which can apply to the Ultra wideband as meeting performance requirements based on structure improvement, circuit supplement, upgraded design method. Before development of the PLL, we simulated spectrum power, phase noise, harmonic characteristic by using ADS(Advanced Designed System). And, we compared result between measurement and simulation. Finally, we confirm a satisfying result which meet performance requirements between required standard and measured value. It will be useful for transceiver of service which operate in Ultra wideband.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.6
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• pp.1045-1054
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• 2006

In this paper, described a design result of bus interface modulo for multiple level MU-SID-1553 data bus network. In general, MIL-SID-1553 network is used for single level data bus topology. But, according to applied system's structure. multiple level bus architecture is required., And for his, micro processor must be involved for system be, and a additional hardware and software functions are needed. The designed data bus interface module is simply consists of communication transceivers and simple electronic circuit without micro processor. Through the hardware testing and software simulation, the functional performance of the designed interface module was successfully validated.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.182-185
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• 2020

특정 통신 프로토콜을 지원하는 물리 계층 트랜시버(PHY)가 없을 때 물리 계층의 부재로 인해 해당 프로토콜이 사용된 통신 시스템을 구현할 수 없다. 그래서 PHY 의 부재는 프로토콜 연구에 큰 걸림돌이 된다. 이런 경우 FPGA 로 물리 계층을 구현할 수 있다. FPGA 를 사용하면 목적과 상황에 맞춰 물리 계층을 구현할 수 있다는 장점이 있다. 통신 속도, 채널의 개수, 오류 검출 알고리즘 등 프로토콜의 다양한 요소를 사용자의 마음대로 구현할 수 있다. 본 논문에는 10Mbps 이더넷 통신에 대한 물리 계층을 FPGA 로 구현하는 실험을 담고 있다. 결과적으로 물리 계층의 구현에 성공했지만 검증에는 실패하였다. 실험에 사용된 보드에는 이더넷 PHY 가 장착되어 있었다. 이더넷 PHY 가 수신 신호를 간섭해서 물리 계층의 동작성을 검증할 수 없었다. 추후에 이더넷 PHY 를 제거하고 재실험을 진행할 것이다. 비록 검증에는 실패했지만, 실험을 통해 FPGA 로 물리 계층을 구현할 수 있음을 보이고 통신 프로토콜 연구 방법으로 이를 제안하고자 한다.

• Journal of the Institute of Convergence Signal Processing
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• v.7 no.3
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• pp.87-94
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• 2006

For realizing an ubiquitous home network(uHome-net), various sensors should be able to be connected to an integrated wire/wireless sensor network. This paper describes an application case of applying LonWorks technology being widely used in control network to wire/wireless sensor network in uHome-net and the design and application of LonRF device that consists of a neuron chip including LonTalk protocol, a 433.92MHz RF transceiver, a sensor, and application programs. As an application example of the LonRF device, the LonRF smart badge that can measure the 3D location of objects in indoor environment and interwork with the uHome-net was developed. LonRF device based home network services were realized on the uHome-net testbed such as indoor positioning service, remote surveillance service and remote metering service were realized. This research shows that LonWorks technology based sensor network could be applicable to the control network in an ubiquitous home network and the LonRF device can be used as a wireless node in various sensor networks.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.3
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• pp.283-291
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• 2012

In this paper, a compact antenna is designed for the UWB lower half-band WVAN Gbps data-rate transceiver. The proposed antenna broadens the bandwidth less than -10 dB by placing the ring stubs and an open stub on the rectangular monopole above the partial ground and creating multiple resonant current paths. The designed antenna goes through the electromagnetic simulation and is fabricated and the implemented antenna has the characteristics of the return loss lower than -10 dB, the antenna gain greater than 5 dBi, and the efficiency over 80 % in the UWB lower half-band ranging from 3.197 GHz to 4.732 GHz. Therefore, it is thought that the proposed antenna is suitable for the size-reduced and excellently performing wireless communication transceiver.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.4
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• pp.7-12
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• 2008

This paper presents a lateral resistive contact RF MEMS switch using comb drive. Our goal was to fabricate the RF MEMS switch with high reliability and good RF characteristics for front end module in wireless transceiver system. Therefore, comb drive is used for large contact force in order to achieve low insertion loss and small off-state capacitance in order to achieve high isolation. The single crystalline silicon is used for mechanical reliability. As a result, the developed switch showed insertion loss less than 0.44 dB at 2 GHz, isolation greater than 60 dB, and low actuation voltage at 26 V.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.8
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• pp.1654-1660
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• 2004

In this paper, we describes the design and implementation of LonWorks communication module for distributed intelligent control using LonWorks technology of Echelon. LonWorks communication module can be divided hardware and firmware. First, hardwares is divided into microcontroller attaching sensors and LonWorks components for working together control network and data network. Hardwares are consisted of neuron chip, microcontroller, transceiver, LONCard. Second, operating firmware is realized with neuron C using NodeBulider 3.0 development tool. Produced and implemented LonWorks communication module is pretested using LTM-10A, Gizmo 4 I/O board, parallel I/O Interface. For field test, microcontroller module part is tested by HyperTerminal, communication procedure in data network is certified by transmitting and receiving short message using LonMaker for Windows tool. Herewith, LON technology is based on network communication technique using LonWorks.