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Low-Power CMOS VCO with Dual-Band Local Oscillating Signal Outputs for 5/2.5-GHz WLAN transceivers

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Tsinghua Science and Technology 2003年第2期8卷 121-125页

作者： CHI Baoyong(池保勇) SHI Bingxue(石秉学) Institute of Microelectronics Tsinghua University Beijing 100084 China Institute of Microelectronics Tsinghua University Beijing 100084 China

The paper describes a low-power CMOS voltage-controlled oscillator (VCO) with dual-band local oscillating (LO) signal outputs for 5/2.5-GHz wireless local area network (WLAN) transceivers. The VCO is based on an on-chip symmetrical spiral inductor and a differential varactor. The 2.5-GHz quadrature LO signals are generated using the injection-locked frequency divider (ILFD) technique. The ILFD structure is similar to the VCO structure with its wide tracking range. The design tool ASITIC was used to optimize all on-chip symmetrical inductors. The power consumption was kept low with differential LC tanks and the ILFD technique. The circuit was implemented in a 0.18-μm CMOS process. Hspice and SpectreRF simulations show the proposed circuit could generate low phase noise 5/2.5-GHz dual band LO signals with a wide tuning range. The 2.5-GHz LO signals are quadrature with almost no phase and amplitude errors. The circuit consumes less than 5.3 mW in the tuning range with a power supply voltage of 1.5 V. The die area is only 1.0 mm×1.0 mm.

关键词： CMOS integrated circuits Frequency dividing circuits transceivers Variable frequency oscillators

Performance Study of MIMO-OSTBC Parallel Relay FSO System Based on GFDM

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Chinese Journal of Electronics 2024年第2期33卷 564-572页

作者： Rui ZHOU Yong WANG Yi WANG Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering China Jiliang University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

This paper investigates the performance of a new generalized frequency division multiplexing(GFDM)parallel relay free space optical(FSO) communication system using multi-input multi-output(MIMO) orthogonal space-time block codes(OSTBC) scheme. Under the M distribution atmospheric turbulence, taking into account the triple effects of irradiance, pointing errors and path loss, the mathematical expression of system symbol error rate is derived with the help of Meijer G-function. The symbol error performance of GFDM is compared with on-off keying,Gaussian minimum shift keying, polarization shift keying and orthogonal frequency division multiplexing(OFDM)modulation methods. The effects of the MIMO-OSTBC parallel relay scheme on the GFDM system including filter roll down coefficient, the number of transmitting and receiving antennas, the number of relays, normalized beamwidth and jitter variance are analyzed, and the numerical results are verified by Monte Carlo simulation. This work provides a good foundation for engineering applications.

关键词： Monte Carlo methods Transmitting antennas Symbols Receiving antennas Modulation Jitter transceivers

Fabrication and performance analysis of a high-coupling-efficiency and convenient-integration optical transceiver

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Optoelectronics Letters 2017年第4期13卷 250-253页

作者： HE Hui-min LIU Feng-man XUE Hai-yun WU Peng SONG Man-gu SUN Yu CAO Li-qiang System Packaging and Integration Research Center Institute of Mieroelectronics of Chinese Academy of Sciences Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China National Center for Advaneed Packaging Wuxi 214135 China

An optical transceiver with a novel optical subassembly structure is proposed in this paper, which achieves high coupling efficiency and low assembly difficulty. The proposed optical transceiver consumes 0.9 W power and retains a small size of 28 mmx16 mmx3 mm. The fabrication process of the silicon substrate and the assembly process of the optical transceiver are demonstrated in details. Moreover, the optical transceiver is measured in order to verify its transmission performance. The clear eye diagrams and the low bit error rate （BER） less than 1013 at 10 Gbit/s per channel show good transmission characteristics of the designed optical transceiver.

关键词： Bit error rate Efficiency Substrates transceivers

Novel high-sensitivity coherent transceiver for optical DPSK/DQPSK signals based on heterodyne detection and electrical delay interferometer

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Chinese Optics Letters 2012年第3期10卷 12-14页

作者：孔德明李岩伍霞王慧郭宏翔洪小斌左勇徐坤李蔚伍剑林金桐 State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

We present a novel coherent transceiver for optical differential phase-shift keying/differential quadrature phase-shift keying （DPSK/DQPSK） signals based on heterodyne detection and electrical delay interferometer. A simulation framework is provided to predict a theoretical sensitivity level for the reported scheme. High sensitivity of –45.18 dBm is achieved for 2.5-Gb/s return-to-zero （RZ）-DPSK signal, and high sensitivities of –36.83 dBm （I tributary） and –35.90 dBm （Q tributary） are observed for 2.5-GBaud/s RZ-DQPSK signal in back-to-back configuration. Transmission for both signals over 100 km is also investigated. Experimental results are discussed and analyzed.

关键词： Heterodyning Optical frequency conversion Quadrature phase shift keying transceivers

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用于计算机无线局域网的微波收发信机

东南大学学报（自然科学版） 1995年第A4期25卷 132-135页

作者：陈忆元朱晓维东南大学毫米波国家重点实验室

用于计算机无线局域网的微波收发信机陈忆元，朱晓维（东南大学毫米波国家重点实验室，南京２１００１８）目前的计算机局域网数据传输媒介仍以各种有线传输媒介为主；有线传输媒介的优点是传输可靠以及传输信息量大（如光纤），但不够... 详细信息

用于计算机无线局域网的微波收发信机陈忆元，朱晓维（东南大学毫米波国家重点实验室，南京２１００１８）目前的计算机局域网数据传输媒介仍以各种有线传输媒介为主；有线传输媒介的优点是传输可靠以及传输信息量大（如光纤），但不够方便灵活，近年来，国外很多人都致力...

关键词： computer networks microwave transmitting and receiving equipment microwave transceivers