• Title/Summary/Keyword: RF design

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The Design of a Ultra-Low Power RF Wakeup Sensor for Wireless Sensor Networks

  • Lee, Sang Hoon;Bae, Yong Soo;Choi, Lynn
    • Journal of Communications and Networks
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    • v.18 no.2
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    • pp.201-209
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    • 2016
  • In wireless sensor networks (WSNs) duty cycling has been an imperative choice to reduce idle listening but it introduces sleep delay. Thus, the conventional WSN medium access control protocols are bound by the energy-latency tradeoff. To break through the tradeoff, we propose a radio wave sensor called radio frequency (RF) wakeup sensor that is dedicated to sense the presence of a RF signal. The distinctive feature of our design is that the RF wakeup sensor can provide the same sensitivity but with two orders of magnitude less energy than the underlying RF module. With RF wakeup sensor a sensor node no longer requires duty cycling. Instead, it can maintain a sleep state until its RF wakeup sensor detects a communication signal. According to our analysis, the response time of the RF wakeup sensor is much shorter than the minimum transmission time of a typical communication module. Therefore, we apply duty cycling to the RF wakeup sensor to further reduce the energy consumption without performance degradation. We evaluate the circuital characteristics of our RF wakeup sensor design by using Advanced Design System 2009 simulator. The results show that RF wakeup sensor allows a sensor node to completely turn off their communication module by performing the around-the-clock carrier sensing while it consumes only 0.07% energy of an idle communication module.

A Study on the Analysis and Design of Wireless LAN RF Transceiver System (무선 LAN RF 송수신 시스템 분석 및 설계에 관한 연구)

  • Yun, Yeo Song;Kim, Hak Sun
    • Journal of Advanced Navigation Technology
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    • v.6 no.4
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    • pp.296-305
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    • 2002
  • This paper suggests the parameters of the requirement conditions of minimum performance for a RF transceiver system design from the specifications of IEEE Std 802.11b and IEEE Std 802.11a. It has yielded the requirement conditions of minimum performance in the design process due to these parameters. A RF transceiver system is simulated by using Agilent ADS(Advanced Design System) after selecting the components of optimal conditions to fabricate the RF transceiver system. The results of both the analysis and the simulation will be used for a real wireless LAN design.

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Trenched-Sinker LDMOSFET (TS-LDMOS) Structure for 2 GHz Power Amplifiers

  • Kim, Cheon-Soo;Kim, Sung-Do;Park, Mun-Yang;Yu, Hyun-Kyu
    • ETRI Journal
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    • v.25 no.3
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    • pp.195-202
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    • 2003
  • This paper proposes a new LDMOSFET structure with a trenched sinker for high-power RF amplifiers. Using a low-temperature, deep-trench technology, we succeeded in drastically shrinking the sinker area to one-third the size of the conventional diffusion-type structure. The RF performance of the proposed device with a channel width of 5 mm showed a small signal gain of 16.5 dB and a maximum peak power of 32 dBm with a power-added efficiency of 25% at 2 GHz. Furthermore, the trench sinker, which was applied to the guard ring to suppress coupling between inductors, showed an excellent blocking performance below -40 dB at a frequency of up to 20 GHz. These results confirm that the proposed trenched sinker should be an effective technology both as a compact sinker for RF power devices and as a guard ring against coupling.

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The Software Algorithm Design a Suitable Ultra-Low Power RF System

  • Kim, Jung-won;Choi, Ung-Se
    • Journal of IKEEE
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    • v.12 no.1
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    • pp.27-33
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    • 2008
  • The demand of wireless communication is increased rapidly due to the development of wireless communication systems, and many people have the great interest about the "RF system". The trend of the RF audio system is to design the system with less power consumption. In this paper, we explain the Software Algorithm Design of RF systems that is suitable for low power consumption.

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Design of ESD Protection Circuits for High-Frequency Integrated Circuits (고주파 집적회로를 위한 ESD 보호회로 설계)

  • Kim, Seok;Kwon, Kee-Won;Chun, Jung-Hoon
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.8
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    • pp.36-46
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    • 2010
  • In multi-GHz RF ICs and high-speed digital interfaces, ESD protection devices introduce considerable parasitic capacitance and resistance to inputs and outputs, thereby degrading the RF performance, such as input/output matching, gain, and noise figure. In this paper, the impact of ESD protection devices on the performance of RF ICs is investigated and design methodologies to minimize this impact are discussed. With RF and ESD test results, the 'RF/ESD co-design' method is discussed and compared to the conventional RF ESD protection method which focuses on minimizing the device size.

Design and Performance Evaluation of M×M MIMO Transmission in ESPAR Antenna (ESPAR 안테나에서 M×M MIMO 송신방식의 설계와 성능 평가)

  • Bok, Junyeong;Lee, Seung Hwan;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.12
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    • pp.1061-1068
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    • 2013
  • In this paper, we propose a $M{\times}M$ beam-space multiple input multiple output (BS-MIMO) system using electronically steerable parasitic array radiator (ESPAR) antenna. Conventional MIMO method required multiple RF chains because it map the transmission signals onto multiple antennas. So, conventional MIMO system has high cost for design and high energy consumption at RF circuit. Also, It is difficult to use MIMO system in battery based mobile terminals with limited physical area. In order to solve these problems, BS-MIMO technique which map the data signal onto bases in beam space domain was proposed using ESPAR antenna with single RF chain. This paper, we design and analyze the performance of extended $M{\times}M$ BS-MIMO technique. Simulation results show that the proposed BS-MIMO system has similar BER performance compare to conventional MIMO scheme. Therefore, BS-MIMO system with single RF chain will has a low RF power consumption and low cost for RF hardware design as compared with conventional MIMO technique with multiple RF chains.

Measuring ultrasonic TOF using Zynq baremetal Multiprocessing (Zynq 기반 baremetal 멀티프로세싱에 의한 초음파 TOF 측정)

  • Kang, Moon ho
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.6
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    • pp.93-99
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    • 2017
  • In this research the TOF (time of flight) of ultrasonic signal is measured using Xilinx's Zynq SoC (system on chip). The TOF is calculated from the difference between periods during which RF (radio frequency) and ultrasonic signals come across a distance, and then travelling distance is obtained by multiplying the TOF by the ultrasonic speed in the air. For this purpose, a ultrasonic pulse is generated from a Zynq's internal ADC, a FIR (finite impulse response) filter, and a Kalman filter. And a RF reference pulse is generated from a RF interface. Based on baremetal multiprocessing, the Kalman filter and the RF interface are c-programmed on Zynq's dual processor cores, with other components fabricated on Zynq's FPGA. With this HW/SW co-design, both lower resource utilization and much smaller designing period were obtained than the HW design. As a design tool, Vivado IDE(integrated design environment) is used to design the whole signal processing system in hierarchical block diagrams.

Study on conversion efficiency of RF-DC converter with series diode (직렬 연결 RF-DC 변환기의 변환효율에 관한 연구)

  • Choi, Ki-Ju;Hwang, Hee Yong
    • Journal of Industrial Technology
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    • v.30 no.A
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    • pp.69-73
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    • 2010
  • In this paper, we designed the RF-DC converter used in wireless power transmission system and studied how to design the RF-DC converter of high conversion efficiency. The RF-DC converter operate at 2.45GHz and the diode is connected with series. The RF-DC converter uses shorted stub for DC loop and matching. We can divide the RF-DC converter circuit into four blocks. The reflection coefficients between the blocks were optimized for the maximum conversion efficiency at 0 dBm input power and $1300{\Omega}$ load impedance. The final design of the RF-DC converter has a 52 percent conversion efficiency.

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Design of Multilayer LPF and RF diode switch for GSM (GSM용 적층형 저역통과필터와 RF 다이오드 스위치의 설계)

  • Choi, U-Sung;Yang, Sung-Hyun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.3
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    • pp.416-423
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    • 2012
  • Using Ansoft HFSS(High Frequency Structure Simulator) and Serenade(circuit simulator), multilayer LPF and RF diode switch for GSM were designed. Diodes were transformed the inductor and capacitor in Tx and Rx for the simulation of equivalent circuit, respectively. In particular, the design of the simulation for multilayer RF diode switch was carried out with considering the variance of device and contraction percentage.