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检索条件"机构=Key Laboratory of RF Circuit and System"

共 86 条记录，以下是51-60 订阅

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The Design of rf Front-end Chip for Typhoon Monitoring Radiometer

The Design of RF Front-end Chip for Typhoon Monitoring Radio...

引用

2015 IEEE 16th International Conference on Communication Technology(ICCT 2015)

作者： Zhiming Fang Zhiqun Cheng Tang Liu Jian Zhang Lili Dang Jian Yu Key Lab.of RF Circuit and System Education MinistryHangzhou Dianzi University Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Micro-system and Information Technology

The paper presents the design and performance of a V-band radiometer MMIC with 0.1μm GaAs pHEMT technology. The circuit includes a frequency double LO chain and a resistive mixer. The resistive mixer with balance structure topology can improve the image-rejection ratio. Compared with other mixers.. the sub-harmonic mixer can achieve high isolation. The typical isolation measured between LO to rf is almost 60 dB. The measured conversion loss of the mixer is from 13 dB to 15 dB over rf frequency 50-60 *** bandwidth of IF reaches 1 GHz. The circuit also exhibits very good phase difference between I/Q within 90± 6°.The completed mixer show 25 dB image-rejection ratio（IRR） over the whole band.

关键词： Resistive mixer Harmonic mixer Singly balanced Image-rejection ratio

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Dynamic time-domain duplexing for self-backhauled millimeter wave cellular networks

Dynamic time-domain duplexing for self-backhauled millimeter...

引用

IEEE International Conference on Communications Workshops, ICC

作者： Russell Ford Felipe Gómez-Cuba Marco Mezzavilla Sundeep Rangan Hangzhou Dianzi University Hangzhou China Ministry of Education Key Laboratory of RF Circuit & System New York University New York NY US

Millimeter wave (mmW) bands between 30 and 300 GHz have attracted considerable attention for nextgeneration cellular networks due to vast quantities of availavery high-dimensional antenna arraysble spectrum and the possibility of very high-dimensional antenna arrays. However, a key issue in these systems is range: mmW signals are extremely vulnerable to shadowing and poor high-frequency propagation. Multi-hop relaying is therefore a natural technology for such systems to improve cell range and cell edge rates without the addition of wired access points. This paper studies the problem of scheduling for a simple infrastructure cellular relay system where communication between wired base stations and User Equipment follow a hierarchical tree structure through fixed relay nodes. Such a systems builds naturally on existing cellular mmW backhaul by adding mmW in the access links. A key feature of the proposed system is that TDD duplexing selections can be made on a link-by-link basis due to directional isolation from other links. We devise an efficient, greedy algorithm for centralized scheduling that maximizes network utility by jointly optimizing the duplexing schedule and resources allocation for dense, relay-enhanced OFDMA/TDD mmW networks. The proposed algorithm can dynamically adapt to loading, channel conditions and traffic demands. Significant throughput gains and improved resource utilization offered by our algorithm over the static, globally-synchronized TDD patterns are demonstrated through simulations based on empirically-derived channel models at 28 GHz.

关键词： Relays Antennas Bandwidth

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The design of rf front-end chip for typhoon monitoring radiometer

The design of RF front-end chip for typhoon monitoring radio...

引用

International Conference on Communication Technology (ICCT)

作者： Zhiming Fang Zhiqun Cheng Tang Liu Jian Zhang Lili Dang Jian Yu Key Lab. of RF Circuit and System Education Ministry Hangzhou Dianzi University Hangzhou China Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Micro-system and Information Technology Shanghai

ISBN: (纸本)9781467370066

The paper presents the design and performance of a V-band radiometer MMIC with 0.1μm GaAs pHEMT technology. The circuit includes a frequency double LO chain and a resistive mixer. The resistive mixer with balance structure topology can improve the image-rejection ratio. Compared with other mixers, the sub-harmonic mixer can achieve high isolation. The typical isolation measured between LO to rf is almost 60dB. The measured conversion loss of the mixer is from 13dB to 15dB over rf frequency 50-60GHz. The bandwidth of IF reaches 1 GHz. The circuit also exhibits very good phase difference between I/Q within 90 ± 6°. The completed mixer show 25dB image-rejection ratio (IRR) over the whole band.

关键词： Radio frequency Frequency measurement PHEMTs Mixers Loss measurement Radiometry

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Compact Coupled-fed Printed Antenna for Eight- Band WWAN/WLAN/ WiMAX Internal Mobile Phone

Compact Coupled-fed Printed Antenna for Eight- Band WWAN/WLA...

引用

2014ANSYS中国技术大会

作者： ZHOU Jiangsheng WANG Yufeng CHANG Lei YU Yufeng ZHOU Tao Jiang Nan Electronic and Communication Research Institute Jiaxing China Key laboratory of RF Circuit and System Hangzhou Dianzi University Hangzhou China

A coupled-fed printed antenna for eight-band covering WWAN/WLAN/WiMAX operation in the mobile phone is *** proposed antenna comprises a long radiating strip,a short-circuited inductive shorting strip,and a coupling strip to capacitively excite the radiating *** using the capacitive excitation,the long radiating strip with the shorting strip can generate a wide lower band to cover the GSM850/900 operation,and the coupling strip can also form a wide upper band to cover GSM850/900/1800/1900/UMTS2100,WLAN2400,and WiMAX2300/2500 *** antenna is suitable to be disposed on a small no-ground board space (15 × 45 mm2) of the system circuit board and enclosed by an L-shaped system ground plane of the mobile phone.A universal series bus (USB) connector for the data port of the mobile phone is accommodated on the protruded ground of the L-shaped system ground *** of the proposed antenna are described,and the obtained results are presented and discussed.

关键词： MIMO mobile phone antennas multi-band

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A tunable CMOS ring VCO in a wide frequency range

A tunable CMOS ring VCO in a wide frequency range

引用

2nd International Conference on Multimedia Technology, ICMT 2011

作者： Zhang, Haipeng Li, Hao Wang, Yang Key Laboratory of RF Circuit and System Hangzhou Dianzi University Ministry of Education Hangzhou China

ISBN: (纸本)9781612847740

In this paper a tunable CMOS ring VCO (Voltage Controlled oscillator) is presented based on five-stage differential structure in a wide frequency range. The proposed VCO circuit is designed in CSMC 0.5μm CMOS process and simulated with Cadence Spectre. The power supply voltage is 5V. Simulation results indicate that the frequency is tuned from 10.85MHz to 148MHz when the control voltage varies from 1.2 V to 4.8V. The phase noise is about -123.8dBc/Hz at 1MHz offset from carrier frequency of 80MHz. The proposed circuitry is simple and easy to be integrated and more suitable for correct timing logic ICs applications. © 2011 IEEE.

关键词： Phase noise

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A 2.12∼2.68GHz wide tuning CMOS LC-VCO with low phase noise

A 2.12∼2.68GHz wide tuning CMOS LC-VCO with low phase noise

引用

China-Japan Joint Microwave Conference

作者： Zhiqun Cheng Lvpo Zhang Longqian Lin Yujie Feng Key Laboratory of RF Circuit and System Ministry of Education Hangzhou Dianzi University Hangzhou China

A wideband LC voltage-control oscillator (VCO) is designed based on SMIC 0.18μm CMOS process, which has wide tuning range by using the switched capacitor array, while the phase noise is reduced after using the differential inductance of high quality factor and the filter method. Simulated results show that the VCO has the tuning range of 23.3% from 2.12GHz to 2.68GHz, and the phase noise of -128.1dBc/Hz at offset of 1MHz from a 2.4GHz carrier. With a 1.8V supply voltage, the power of core circuit is 6.9mW.

关键词： Phase noise Voltage-controlled oscillators Tuning Capacitors Arrays Switching circuits Switches

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A neural network model of silicon-based millimeter-wave coplanar waveguide

A neural network model of silicon-based millimeter-wave copl...

引用

China-Japan Joint Microwave Conference

作者： Zhiqun Cheng Liwei Jin Qingna Wang Lingling Sun Key Laboratory of RF Circuit and System Ministry of Education Hangzhou Dianzi University Hangzhou China

In this paper, neural network modeling techniques are presented for millimeter-wave modeling of silicon-based millimeter-wave coplanar waveguide. The neural network is trained to learn the mapping between the geometrical variables and S parameter of the coplanar waveguide. Once trained with the EM data, this model provides accurate and fast prediction of the measurement data of differential CPW with geometry parameters as variables. Experiments in comparison with input-output relationships by the proposed neural network model and measurement data are included to demonstrate the merits of this new model.

关键词： Artificial neural networks Neurons Coplanar waveguides Training Scattering parameters Microwave theory and techniques Data models

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A tunable CMOS ring VCO in a wide frequency range

A tunable CMOS ring VCO in a wide frequency range

引用

International Conference on Multimedia Technology

作者： Haipeng Zhang Hao Li Yang Wang Key Laboratory of RF Circuit & System Ministry of Education School of Electronics & Information Hangzhou Dianzi University Hangzhou China

ISBN: (纸本)9781612847719

In this paper a tunable CMOS ring VCO (Voltage Controlled oscillator) is presented based on five-stage differential structure in a wide frequency range. The proposed VCO circuit is designed in CSMC 0.5μm CMOS process and simulated with Cadence Spectre. The power supply voltage is 5V. Simulation results indicate that the frequency is tuned from 10.85MHz to 148MHz when the control voltage varies from 1.2 V to 4.8V The phase noise is about -123.8dBc/Hz at 1MHz offset from carrier frequency of 80MHz. The proposed circuitry is simple and easy to be integrated and more suitable for correct timing logic ICs applications.

关键词： Voltage-controlled oscillators CMOS integrated circuits Phase noise Tuning Delay Voltage control

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Study of millimeter wave ALGaN/AlN/GaN HEMT

Study of millimeter wave ALGaN/AlN/GaN HEMT

引用

International Conference on Electronics, Communications and Control (ICECC)

作者： Zhiqun Cheng Tang Liu Liwei Jin Zhihong Feng Jianbo Song Jiayun Yin Key Laboratory of RF Circuit and System Education Ministry Hangzhou Dianzi University Hangzhou China Science and Technology on ASIC Laboratory Hebei Semiconductor Research Institute Shijiazhuang China

A novel structure AlGaN/AlN/GaN HEMT was proposed in the paper. The barrier layer's thickness was optimized in order to increase characteristic frequency. TCAD software of Silvaco was using to simulate DC and AC performances of proposed device. Optimum size for barrier thickness was achieved after simulation. The proposed devices were fabricated and measured. Measured results are identical to simulated results for characteristic frequency.

关键词： Gallium nitride HEMTs Frequency measurement Aluminum gallium nitride Logic gates Semiconductor process modeling Fabrication

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Design and DC parameter extraction of the high linearity Al0.27Ga0.73N/AlN/Al0.04Ga0.96N/GaN HEMT

Design and DC parameter extraction of the high linearity Al0...

引用

International Conference on Electronics, Communications and Control (ICECC)

作者： Zhiqun Cheng Qingna Wang Zhihong Feng Jianbo Song Jiayun Yin Key Laboratory of RF Circuit and System Education Ministry Hangzhou Dianzi University Hangzhou China Science and Technology on ASIC Laboratory Hebei Semiconductor Research Institute Shijiazhuang China

DC parameter extraction of a novel high linearity Al 0.27 Ga 0.73 N/AlN/ Al 0.04 Ga 0.96 N/GaN HEMT with composited-layer and unintentionally doping barrier is presented. The devices with gate length of 0.3μm and T-shaped gate width of 1000μm are designed and fabricated. EEHEMT1 model is adapted to DC parameter extraction by using software of ICCAP. Comparison between measured results and simulated results shows extracting parameters of EEHEMT1 model are in good agreement with measured results.

关键词： HEMTs Gallium nitride Load modeling Parameter extraction Logic gates Computational modeling Linearity

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