• Title/Summary/Keyword: Low-power transceiver

Search Result 118, Processing Time 0.029 seconds

Design and Fabrication of Low Loss, High Power SP6T Switch Chips for Quad-Band Applications Using pHEMT Process (pHEMT 공정을 이용한 저손실, 고전력 4중 대역용 SP6T 스위치 칩의 설계 및 제작)

  • Kwon, Tae-Min;Park, Yong-Min;Kim, Dong-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.22 no.6
    • /
    • pp.584-597
    • /
    • 2011
  • In this paper, low-loss and high-power RF SP6T switch chips are designed, fabricated and measured for GSM/EGSM/DCS/PCS applications using WIN Semiconductors 0.5 ${\mu}m$ pHEMT process. We utilized a combined configuration of series and series-shunt structures for optimized switch performance, and a common transistor structure on a receiver path for reducing chip area. The gate width and the number of stacked transistors are determined using ON/OFF input power level of the transceiver system. To improve the switch performance, feed-forward capacitors, shunt capacitors and parasitic FET inductance elimination due to resonance are actively used. The fabricated chip size is $1.2{\times}1.5\;mm^2$. S-parameter measurement shows an insertion loss of 0.5~1.2 dB and isolation of 28~36 dB. The fabricated SP6T switch chips can handle 4 W input power and suppress second and third harmonics by more than 75 dBc.

A study on the short-range underwater communication using visible LEDs (근거리 수중통신을 위한 가시광 LED 적용에 관한 연구)

  • Sohn, Kyung-Rak
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.37 no.4
    • /
    • pp.425-430
    • /
    • 2013
  • Robust and high speed underwater communication is severely limited when compared to communications in terrestial. In free space, RF communication operates over long distances at high data rates. However, the obstacle in seawater is the severe attenuation due to the conducting nature. Acoustic modems are capable of long range communication up to several tens of kilometers, but it has low data-rate, high power consumption and low propagation speed. An alternative means of underwater communication is based on optics, wherein high data rates are possible. In this paper, the characteristics of underwater channel in the range of visible wavelength is investigated. And the possibility of optical wireless communication in underwater is also described. The LED-based transceiver and CMOS sensor module are integrated in the system, and the performance of image transmission was demonstrated.

A Design of Transceiver for 13.56MHz RFID Reader using the Peak Detector with Automatic Reference Voltage Generator (자동 기준전압 생성 피크 검출기를 이용한 13.56 MHz RFID 리더기용 송수신기 설계)

  • Kim, Ju-Seong;Min, Kyung-Jik;Nam, Chul;Hurh, Djyoung;Lee, Kang-Yun
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.47 no.3
    • /
    • pp.28-34
    • /
    • 2010
  • In this paper, the transceiver for RFID reader using 13.56MHz as a carrier frequency and meeting International Standard ISO 14443 type A, 14443 type B and 15693 is presented. The receiver is composed of envelope detector, VGA(Variable Gain Amplifier), filter, comparator to recovery the received signal. The proposed automatic reference voltage generator, positive peak detector, negative peak detector, and data slicer circuit can adjust the decision level of reference voltage over the received signal amplitudes. The transmitter is designed to drive high voltage and current to meet the 15693 specification. By using inductor loading circuit which can swing more than power supply and drive large current even under low impedance condition, it can control modulation rate from 30 percent to 5 percent, 100 perccnt and drive the output currents from 5 mA to 240 mA depending on standards. The 13.56 MHZ RFID reader is implemented in $0.18\;{\mu}m$ CM08 technology at 3.3V single supply. The chip area excluding pads is $1.5mm\;{\times}\;1.5mm$.

A Study on the Fog Detecting System Using Photo Sensor (광센서를 이용한 안개 탐지 시스템 연구)

  • No, Byeang-Su;Kim, Kab-Ki
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.19 no.6
    • /
    • pp.643-648
    • /
    • 2013
  • In this paper, we developed a system which can detect and can alarm about the sailing provocative climate by using a photo. The research on domestic shipbuilding industry and in IT fusion technology is under construction, but a reliable safety device which can alarm a sailor about the circumstances of the fog and rain during ship operation as soon as possible due to the constant state in domestic. In this paper, a compact, for system low-power transceiver and data processing equipment for sensing were developed, also a performance evaluation got accomplished with simulation analysis. In results, it is operating normally at least 32.36[dB] and maximum values f 89.20[dB] in the domestic, and 32.55 to 60.66[dB] in the outdoors.

A Study on Environment Management System in Tunnel using Wireless Sensor Networks (무선 센서 네트워크를 이용한 터널 내 환경 관리 시스템에 관한 연구)

  • Joo, Yang-Ick;Kim, Jae-Wan
    • Journal of Korea Multimedia Society
    • /
    • v.16 no.10
    • /
    • pp.1196-1203
    • /
    • 2013
  • In general, the cost of transceiver for wireless network configuration is more expensive than that for wired network. However, in case of environmental management system in a tunnel, the cost can be minimized by adopting low rate tranceiver because the amount of the exchanged data for tunnel monitoring is very small. When the obtained data from sensor node is sent directly to the corresponding command node, there is no need to consider routing problem of the data transfer. However in this case, sensor nodes are required to be implemented with high power transmitter and experience high energy consumption. To tackle this problem, relay nodes can be used to transfer the data of tunnel monitoring, and suitable routing protocols for selecting optimum path are needed. Therefore, in this paper, we propose a routing algorithm and a self-configuration protocol for environment management system in tunnel.

A High Performance Transmission Method for Massively Delivering Multimedia Data in WMSN (무선 멀티미디어 센서 네트워크(WMSN) 환경에서 멀티미디어 데이터 전송을 위한 대용량 전송 기법에 대한 연구)

  • Lee, Jae-Ho;Eom, Doo-Seop
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.37A no.11
    • /
    • pp.903-917
    • /
    • 2012
  • For transmitting sensed data, wireless sensor networks have been developed and researched for the improvement of energy efficiency, hence, many MAC protocols in WSN employ the duty cycle mechanism. Since the progressed development of the low power transceiver and processor let the high energy efficiency come true, the delivery of the multimedia data which occurs in area of sensor work should be needed to provide supplemental information. In this paper, we design a new scheme for massive transmission of large multimedia data where the duty cycle is used in contention based MAC protocol, for WMSN. The proposed scheme can be applied into the previous duty cycle mechanism because it provides two operation between normal operation and massive transmission operation. Measuring the buffer status of sender and the condition of current radio channel can be criteria for the decision of the above two operations. This paper shows the results of the experiment by performing the simulation. The target protocol of the experiment is X-MAC which is contention based MAC protocol for WSN. And two approaches, both X-MAC which operates only duty cycle and X-MAC which operates combined massive transmission scheme, are used for the comparative experiment.

A Design and Implementation of 4×10 Gb/s Transimpedance Amplifiers (TIA) Array for TWDM-PON (TWDM-PON 응용을 위한 4×10 Gb/s Transimpedance Amplifier 어레이 설계 및 구현)

  • Yang, Choong-Reol;Lee, Kang-Yoon;Lee, Sang-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.39B no.7
    • /
    • pp.440-448
    • /
    • 2014
  • A $4{\times}10$ Gb/s Transimpedance Amplifier (TIA) array is implemented in $0.13{\mu}m$ CMOS process technology, which will be used in the receiver of TWDM-PON system. A technology for bandwidth enhancement of a given $4{\times}10$ Gb/s TIA presented under inductor peaking technology and a single 1.2V power supply based low voltage design technology. It achieves 3 dB bandwidth of 7 GHz in the presence of a 0.5 pF photodiode capacitance. The trans-resistance gain is $50dB{\Omega}$, while 48 mW/ 1channel from a 1.2 V supply. The input sensitivity of the TIA is -27 dBm. The chip size is $1.9mm{\times}2.2mm$.

A Period Adaptive Wakeup Technique based on Receive Prediction for WSN (무선 센서 네트워크를 위한 수신 예측 기반 주기 적응적 웨이크업 기법)

  • Lee, Kyung-Hoon;Lee, Hak-Jai;Kim, Young-Min
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.10 no.11
    • /
    • pp.1265-1270
    • /
    • 2015
  • For the sensor node or collection node operating with a battery in a wireless sensor network, MAC protocols with improved energy efficiency are important performance factors. In this paper, in order to improve the restrictive capability in accordance with the fixed activity period of the duty cycle technology in the MAC protocol for wireless sensor networks, we propose a periodic adaptive wakeup technique based on receive prediction. The proposed technique is through a performance evaluation using the CC2500 RF transceiver and C8051F330 microcontroller based wireless node, to analyze the minimum active period. As a result, it was confirmed that it is possible to improve energy efficiency by adaptively changing the sleep period in accordance with the change of period.

Wireless Vibration Measurement System Using a 3-Axial Accelerometer Sensor (3축 가속도 센서 기반의 무선 진동 측정 시스템)

  • Yoo, Ju-Yeon;Park, Geun-Chul;Jeon, Ah-Young;Kim, Cheol-Han;Kim, Yun-Jin;Ro, Jung-Hoon;Jeon, Gye-Rok
    • Journal of Sensor Science and Technology
    • /
    • v.20 no.2
    • /
    • pp.131-136
    • /
    • 2011
  • In this study, a compact wireless vibration measurement system was developed using a 3-axial accelerometer in order to evaluate the vibration stimulation system. A low power microprocessor chip integrated with 2.4 GHz RF transceiver was used for the wireless data communication. To evaluate the system, the frequencies and accelerations from the vibration stimulation system were measured using an LVDT sensor and a vibration measurement system. The average frequency difference by the measurement system was less than 0.1 Hz, and the standard deviation of frequencies estimated by the LVDT sensor and the accelerometer was below 0.08 Hz. The developed system was applied to access a vibration stimulation system for the future study. The average acceleration difference of the central and peripheral point of the stimulation system was less than 0.0005 g(1 g=9.8 $m/s^2$), and the standard deviation of the acceleration was below 0.004 g, which shows the usefulness of the wireless vibration measurement system.

Ocean Fog Detection Alarm System for Safe Ship Navigation (선박 안전항해를 위한 해무감지 경보 시스템)

  • Lee, Chang-young
    • Journal of Advanced Navigation Technology
    • /
    • v.24 no.6
    • /
    • pp.485-490
    • /
    • 2020
  • Recently, amid active research on domestic shipbuilding industry and IT convergence technology, with the development of satellite detection technology for ship safety operation, ships monitored the movement of ships with the mandatory long-range identification & tracking of vessels and automatic identification system. It is possible to help safe navigation, but it is necessary to develop safety device that alert the marine officer who rely on radar to correct conditions in case of weightlessness. Therefore, an ocean fog alarm system was developed to detect and inform using photo sensors. The fabricated ocean fog detect and alarm system consists of a small, low-power optical sensor transceiver and data sensing processing module. Through experiment, it is confirmed that the fabricated ocean fog detect and alarm system measure the corresponding concentration of ocean fog for fogless circumstance and fogbound circumstance, respectively. Furthermore, the fabricated system can control RPM of ship engine according to the concentration of ocean fog, and consequently, the fabricated system can be applied to assistant device for ship safety operation.