• Title/Summary/Keyword: RF transmitter-receiver

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Design and Fabrication of 1.2GHz range RF Transmitter and Receiver for Bi-directional Capsule Endoscopes (양방향 캡슐형 내시경용 1.2GHz 대역 RF 송수신기 설계 및 제작)

  • 장경만;문연관;류원열;윤영섭;조진호;최현철
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.81-85
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    • 2003
  • The Bi-directional Wireless Capsule endoscope con sists of CMOS Image sensor, FPGA, LED, Battery, DC to DC Converter, Transmitter, Receiver and Antennas. The RF transmitter at 1.2GHz range is designed and fabricated with 10 mm(diameter)x1.6 mm(thickness) dimension considering the maximum permission exposure(MPE), system size, power consumption, linearity and modulation method. The fabricated RF receiver at 400MHz range can demodulate the external signals so as to control the behavior of CMOS image sensor. four LEDs and Transmitter.

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A 900 MHz ZigBee CMOS RF Transceiver Using Switchless Matching Network (무스위치 정합 네트워크를 이용한 900 MHz ZigBee CMOS RF 송수신기)

  • Jang, Won Il;Eo, Yun Seong;Park, Hyung Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.8
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    • pp.610-618
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    • 2017
  • This paper presents a 868/915 MHz CMOS RF transceiver for the ZigBee application. Using a switchless matching network, the off chip switch is removed to achieve the low cost RF transceiver, and by the elimination of the switch's insertion loss we can achieve the benefits for the RF receiver's noise figure and transmitter's power efficiency at the given output power. The receiver is composed of low-noise amplifier, mixer, and baseband analog(BBA) circuit. The transmitter is composed of BBA, mixer, and driver amplifier. And, the integer N type frequency synthesizer is designed. The proposed ZigBee RF full transceiver is implemented on the $0.18{\mu}m$ CMOS technology. Measurement results show that the maximum gain and the noise figure of the receiver are 97.6 dB and 6.8 dB, respectively. The receiver consumes 32 mA in the receiver mode and the transmitter 33 mA in the transmission mode.

Improved Ultrasonic Satellite System for the Localization of Mobile Robots (이동로봇의 위치측정을 위한 개선된 초음파 위성 시스템)

  • Kim, Su-Yong;Yoon, Kang-Sup
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.12
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    • pp.1240-1247
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    • 2011
  • The localization of mobile robot in environment is a major concern in mobile robot navigation. So, many kinds of localization techniques have been researched for several years. Among them, the positioning system using ultrasound has received attention. Most of these ultrasonic positioning systems to synchronize the transmitters and receivers are used for RF (Radio Frequencies). However, due to the use of RF, the interference problems can not be avoided and the performance of radio frequencies directly affects the positioning performance. So we proposed the ultrasonic positioning system without synchronizing RF. The proposed system is based on existing USAT (Ultrasonic Satellite System) adopted infrastructure transmitting type, and consists of transmitter and receiver synchronizing modules instead of the radio frequency transmitters and receiver. The ultrasonic transmitters and receivers are synchronized individually by the transmitter and receiver synchronizing modules. In order to calculate the bias between the transmitter and receiver synchronizing modules, new positioning algorithm similar to GPS was proposed. The positioning performance of the improved USAT without synchronizing RF and the validity of the proposed positioning algorithm are verified and evaluated by experiments.

A Design an Implementation of a Base Station Transceiver for WLL System (무선 가입자 접속망 기지국용 송수신기 설계 및 구현)

  • 정영준;강상기;이일규;김봉겸;홍헌진
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.8 no.6
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    • pp.600-613
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    • 1997
  • The implementation of a BTS(Base station Transceiver) for WLL system using W-CDMA(Wideband-Code Division Multiple Access) method is presented in this paper. It consists of three boards; receiver, transmitter and RF controller. Some RF parameters are considered and simulated by the RF simulation S/W using commercial and customized components specifications. The implemented transceiver of 5 MHz RF channel bandwidth satisfies the system requirements of a transceiver such as dynamic range, sensitivity in the receiver and spurious emission suppression in the transmitter. At the receiver, the experimental measurement showed 2.86 dB of NF and 60 dB above of dynamic range in AGC(Automatic Gain Control) locking. At the transmitter, the -49.46 dBc of spurious emission suppression is attained when the output power of the transmitter is 34.3 dBm. These results are good enough to meet to standard performance specifications.

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Implementation of a RF Transceiver for Sensor Nodes (센서노드용 RF송수신기의 구현)

  • Kang, Sang-Gee;Choi, Heung-Taek
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.6
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    • pp.1051-1057
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    • 2009
  • USN(Ubiquitous Sensor Network) is used to provide many services such as bridge monitoring, cultural properties monitoring, river monitoring, protection of an old and feeble person, management and control of a city and circumstance monitoring, etc. A RF transceiver is needed for implementing USN. In this paper the implementation and the design of a RF transceiver for sensor nodes operating in 2.4GHz frequency band are presented. The design procedure of AGC, a receiver and a transmitter is described. And the performance of the implemented RF transceiver is also tested. The test results of receiver sensitivity, receiver dynamic range, frequency stability, phase noise, output power of transmitter, flatness and spectrum mask are presented.

Implementation of Radio Frequency Communication System based Serial UART Communication (직렬 UART 통신 기반 rf 통신 시스템 구현)

  • Jin, Hyun-Soo
    • Journal of Digital Convergence
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    • v.12 no.12
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    • pp.257-264
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    • 2014
  • Through MCU model, Radio Frequency communication is completed using universal asynchronous receiver and transmitter. The communicatin with PC and MCU is completed using RS-232 cable. At first interconnected communication with PC and MCU is necessary for RF communication because tha UART is based technique for RF communication. Program imbeded in microcontroller unit is ran during RF signal is transmitted to other RF module. Data connected with PC and MCU is transmitted between PC and MCU during PC and MCU is connected.

Review on Performance Requirements, Design and Implementation of RF Transceiver for Mobile Communications

  • Lee, Il-Kyoo;Ryu, Seong-Ryeol;Oh, Seung-Hyeub;Hong, Heon-Jin
    • Information and Communications Magazine
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    • v.24 no.3
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    • pp.76-86
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    • 2007
  • This paper describes the RF performance issues of UE RF Transceiver for W-CDMA system based on 3GPP specifications. the parameters of transmitter and receiver are derived from the viewpoint of RF performance. In order for UE to achieve high performance, the transceiver performance requirements such as ACIR, EVM, Peak Code Domain Error, spectrum emission mask, frequency error stability and TX power control dynamic range for transmitter and reference sensitivity level, blocking characteristics, noise figure, ACS, linearity, AGC dynamic range for receiver are considered. On the basis of the required parameters, the UE RF transceiver is designed and then implemented. The evaluation of RF performance is accomplished through practical test scenarios.

Design and Implementation of A PC Protection using RF Transmitter-Receiver (RF 송수신기를 이용한 PC 보안 설계 및 구현)

  • Lee, Keun-Wang;Park, Il-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.2
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    • pp.287-293
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    • 2009
  • This paper would suggest about data communicate using RF Transmitter-Receiver and about PC protection method authenticate using software of PC which Receiver is connected. Older PC protection system is demanded manual operation of the user but the suggesting method protect PC automatically with judge existing of the user who has Tag approaches the distance which gets near. And it is impossible about the forgery and it is safe about sniffing attack and spoofing.

The Research about improvement of receive sensitivity for RF module in ISM band (ISM 밴드 RF 모듈의 수신감도 향상에 관한 연구)

  • Lee, Hyuck-Jin;Yang, Oh
    • Proceedings of the KIEE Conference
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    • 2002.11c
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    • pp.613-616
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    • 2002
  • This paper has been studied an improvement of receive sensitivity for RF module of Industrial Scientific Medical(ISM) Band. In the paper, Also this paper handles receive sensitivity progress of RF module in ISM band. how to improve receive sensitivity adds to Surface Acoustic Wave(SAW) filter, Low Noise Filter(LNA), etc and insulates receiver and transmitter. And then the circuit is inspected by the effective range test of receiver and transmitter. And this Paper was designed that micro-controler controls the part of RF by software.

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Developmemt of automobile sensor monitoring system (자동차 센서 모니터링 시스템 개발)

  • Choi, Nakg-Won;Lee, Sang-Hoon
    • Journal of Sensor Science and Technology
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    • v.14 no.3
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    • pp.150-155
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    • 2005
  • We propose a newly developed automobile sensor monitoring system incorporated with a tire pressure monitoring sensor(TPMS). The RF-transmitter based on a tire pressure sensor, sends a frame data about measured tire-pressure to RF receiver. And the various sensing signals based on sensors such as fuel-level sensor, engine oil level sensor and temperature sensors, are converted into 10-bit digital data. The microprocessor displays converting data such as tire pressure, trip distance, fuel quantity, coolant temperature and car-room temperature, on LCD panel. The proposed system can be successfully adapted to monitoring of the tire pressure and various automobile sensors.