• 제목/요약/키워드: CMOS transceiver

검색결과 97건 처리시간 0.029초

A Behavioral Analysis of an Interpolation I]R Inter and Sigma Delta DAC for ADSL Applications

  • Kim, Sun-Hong;Son, Ju-Ho;Park, Seok-Woo;Kim, Dong-Yong;Yun, Chang-Hun
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2002년도 ITC-CSCC -1
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    • pp.231-234
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    • 2002
  • A transceiver for ADSL systems contains an interpolated combfilter, halfband filters, oversampling sigma delta modulator, a current steering DAC and an analog filler. The circuit complexity of the architecture makes it necessary to use behavioral models to determine the system features. For this reason, we need a specific behavioral simulation environment using the Matlab program. The Matlab is crucial for these circuits to be rapidly incorporated in larger systems, in particular in the context of mixed-signal-test schemes. Design trade-off among the blocks has also been discussed. The design methodology is based on behavioral design and CMOS process.

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A Noncoherent UWB Communication System for Low Power Applications

  • Yang, Suck-Chel;Park, Jung-Wan;Moon, Yong;Lee, Won-Cheol;Shin, Yo-An
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제4권3호
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    • pp.210-216
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    • 2004
  • In this paper, we propose a noncoherent On-Off Keying (OOK) Ultra Wide Band (UWB) system based on power detection with noise power calibration for low power applications. The proposed UWB system achieves good bit error rate performance which is favorably comparable to that of the system using the ideal adaptive threshold, while maintaining simple receiver structure, In addition, low power Analog Front-End (AFE) blocks for the proposed noncoherent UWB transceiver are proposed and verified using CMOS technology. Simulation results on the pulse generator, delay time generator and 1-bit Analog-to-Digital (AID) converter show feasibility of the proposed UWB AFE system.

2-5 Gb/s 클럭-데이터 복원기를 위한 위상 비교기 설계 연구 (A Design Study of Phase Detectors for the 2.5 Gb/s Clock and Data Recovery Circuit)

  • 이영미;우동식;유상대;김강욱
    • 한국전자파학회:학술대회논문집
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    • 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
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    • pp.394-397
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    • 2002
  • A design study of phase detectors for the 2.5 Gb/s CDR circuit using a standard 0.18-${\mu}{\textrm}{m}$ CMOS process has been performed. The targeted CDR is based on the phase-locked loop and thus it consists of a phase detector, a charge pump, a LPF, and a VCO. For high frequency operation of 2.5 Gb/s, phase detector and charge pump, which accurately compare phase errors to reduce clock jitter, are critical for designing a reliable CDR circuit. As a phase detector, the Hogge phase detector is selected but two transistors are added to improve the performance of the D-F/F. The charge pump was also designed to be placed indirectly input and output.

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LPF 내장형 7중 대역 LTCC 프런트엔드모듈 설계 (Design of 7 Bands LTCC Front-end Module Embedded LPF)

  • 김형은;서영광;김인배;문제도;이문규
    • 전기학회논문지
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    • 제61권3호
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    • pp.427-432
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    • 2012
  • In this paper, we have designed and fabricated 7-bands (GSM 850/900, DCS/PCS, and UMTS 3 bands) LTCC front end module (FEM) embedded LPF (low pass filter) to efficiently eliminate harmonics generated in TX path. The proposed FEM is composed of flip-chip typed CMOS SP9T switch to select transceiver signals, dual type SAW filters to receive Rx signals, and 0603 size chip components for the antenna matching and ESD protection. The whole size of FEM is $4.5{\times}3.2{\times}1.2mm^3$. The insertion loss of Tx and Rx ports are measured at 1.7 dB and 4.8 dB, respectively.

24GHz Four-port 직접변환 송-수신기 검증을 위한 System module 구현 (Design of System module to verify 24GHz four-port direct conversion transceiver)

  • 문성모;송준;이문규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.1923-1924
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    • 2008
  • 본 논문에서는 실리콘 기반에 집적화 가능한 새로운 구조의 K-band 4포트 직접변환 수신기 구조를 제안하며, 복조기를 측정하기 위한 K-band 변조 신호를 구현할 수 있는 변조기 모듈을 제작, 변조 신호와 복조기를 검증하였다. 제안된 수신 구조는 CMOS와 같은 실리콘 기반의 IC에서 집적화 할 수 있는 소형화된 새로운 방법이며, 회로를 검증하기 위하여 0.18um CMOS 공정을 이용 제작, 구조의 가능성을 검증하였다. 또한 비교적 낮은 변조 신호를 이용하여 K-band 대역 이상의 변조 신호를 만들 수 있는 방법을 제안, 제작 측정하였다.

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무선랜용 I/Q 채널 12bit 120MHz CMOS D/A 변환기 설계 (I/Q channel 12-Bit 120MHz CMOS D/A Converter for WLAN)

  • 하성민;남태규;서성욱;신선화;주찬양;윤광섭
    • 대한전자공학회논문지SD
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    • 제43권11호
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    • pp.83-89
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    • 2006
  • 본 논문에서는 무선통신용 송수신기에 집적화할 수 있도록 $0.35{\mu}m$ CMOS n-well 1-poly 4-metal 공정을 이용하여 3.3V의 전원 전압으로 동작하는 I/Q 채널 12비트 120MHz 전류구동 D/A 변환기를 설계하였다. 설계된 12비트 D/A 변환기는 4비트 온도계 디코더를 3단 구성하여 글리치 에너지와 선형오차 특성을 최소화하였다. 측정된 선형오차인 INL/DNL은 각각 ${\pm}1.5LSB$, ${\pm}1.3LSB$이며, 글리치 에너지는 31pV.s 로 측정되었고, 전력소모는 105mW이다. 샘플링 및 입력주파수가 각각 120MHz, 1MHz일 때, 싱글 톤 테스트에서 유효비트수는 10.5비트로 측정되었다. 듀얼 톤 테스트에서 1MHz/1.1MHz의 기저대역신호는 0.9MHz/1.2MHz의 영상신호 차이가 -63dB 나타나는 것으로 측정되었다.

A Low-Energy Ultra-Wideband Internet-of-Things Radio System for Multi-Standard Smart-Home Energy Management

  • Khajenasiri, Iman;Zhu, Peng;Verhelst, Marian;Gielen, Georges
    • IEIE Transactions on Smart Processing and Computing
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    • 제4권5호
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    • pp.354-365
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    • 2015
  • This work presents an Internet of Things (IoT) system for home energy management based on a custom-designed Impulse Radio Ultra-Wideband (IR-UWB) transceiver that targets a generic and multi-standard control system. This control system enables the interoperability of heterogeneous devices: it integrates various sensor nodes based on ZigBee, EnOcean and UWB in the same middleware by utilizing an ad-hoc layer as an interface between the hardware and software. The paper presents as a first the design of the IR-UWB transceiver for a portable sensor node integrated with the middleware layer, and also describes the receiver connected to the control system. The custom-designed low-power transmitter on the sensor node is fabricated with 130 nm CMOS technology. It generates a signal with a 1.1 ns pulse width while consuming $39{\mu}W$ at 1 Mbps. The UWB sensor node with a temperature measurement capability consumes 5.31 mW, which is lower than the power level of state-of-the-art solutions for smart-home applications. The UWB hardware and software layers necessary to interface with the control system are verified in over-the-air measurements in an actual office environment. With the implementation of the presented sensor node and its integration in the energy management system, we demonstrate achievement of the broad flexibility demanded for IoT.

A Fully Integrated SoC for Smart Capsule Providing In-Body Continuous pH and Temperature Monitoring

  • Liu, Heng;Jiang, Hanjun;Xia, Jingpei;Chi, Zhexiang;Li, Fule;Wang, Zhihua
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제16권5호
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    • pp.542-549
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    • 2016
  • This paper presents a SoC (System-on-a-Chip) dedicated for a single-chip smart capsule which can be used to continuously monitor human alimentary canal pH and temperature values. The SoC is composed of the pH and temperature sensor interface circuit, a wireless transceiver, the power management circuit and the flow control logic. Fabricated in $0.18{\mu}m$ standard CMOS technology, the SoC occupies a die area of ${\sim}9 mm^2$. The SoC consumes 6.15 mW from a 3 V power supply, guaranteeing the smart capsule battery life is no less than 24 hours when using 50 mAh coin batteries. The experimental results show that measurement accuracy of the smart capsule is ${\pm}0.1$ pH and ${\pm}0.2^{\circ}C$ for pH and temperature sensing, respectively, which meets the requirement of in-body pH and temperature monitoring in clinical practice.

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

  • 손경락
    • Journal of Advanced Marine Engineering and Technology
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    • 제37권4호
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    • pp.425-430
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    • 2013
  • 수중통신은 지상통신에 비하여 통신채널의 강건성과 고속데이터 전송 측면에서 상당한 제약 요인을 가지고 있다. 공기 중에서 RF 통신은 장거리 전송에도 높은 데이터 전송률을 보이지만, 수중에서는 매질의 전도특성으로 인하여 전파에너지의 심각한 감쇠현상이 발생하여 통신이 어려운 실정이다. 현재 수중에서 수 십 킬로미터 이상의 장거리 통신이 가능한 음향파 통신 모뎀이 개발되어 사용되고 있지만 낮은 전송율과 높은 전력 소모, 느린 전송속도가 문제로 거론되고 있다. 이 문제를 보완할 수 있는 방안으로 빛을 이용한 근거리 수중무선통신이 대안으로 연구되고 있다. 본 논문에서는 가시광 파장영역에서 수중통신 채널 특성을 분석하였다. 자유공간 광무선 통신과 비교하여 수중 가시광 통신기술의 가능성을 제시하고, LED 기반 트랜시버와 CMOS 센서를 통신시스템에 장착하여 수중이미지 전송을 위한 광무선 통신 시스템을 시연하였다.