共查询到20条相似文献,搜索用时 346 毫秒
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Eoin O''Ciardha Jason Lynch Brendan Lyons Sean Cremin Sverre Lidholm 《International Journal of Infrared and Millimeter Waves》2002,23(6):841-854
Details on a broadband MMIC frequency doubler targeting the MVDS market are presented. The design evolution from an individual pHEMT device to the complete practical doubler realisation is discussed. The doubler MMIC, which has been fabricated using the GMMT H40 GaAs process, has been evaluated in a customised package. An output power of +10 dBm at 40 GHz has been achieved with an associated conversion gain of 1.5 dB. The measured and predicted performance responses are compared. This chip is ideally suited to use in a number of emerging mm-wave applications. 相似文献
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Raghbir S. Tahim Kai Chang 《International Journal of Infrared and Millimeter Waves》1988,9(10):825-835
Using packaged GaAs varactor diodes, a high efficiency 46 to 92 GHz frequency doubler has been developed. Microstrip circuits have been used to match the input and output impedances presented by the diode. A conversion loss of 8 to 10 dB was measured. This doubler circuit is useful for W-band (75 to 110 GHz) integrated circuit receivers and transceivers. The use of microstrip circuit can drastically reduce the fabrication cost in addition to size and weight. 相似文献
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石墨烯作为一种拥有高电子迁移率和高饱和速度的二维材料,在射频电子学领域具有很大的应用潜力,引起了人们广泛的研究兴趣.近些年随着化学气相沉积制备石墨烯技术的发展,高质量大尺寸的单晶石墨烯生长技术也愈加成熟.本文基于化学气相沉积生长的毫米级单晶石墨烯,在高介电常数介质上制备出高性能的石墨烯倍频器,并且对其倍频特性做了系统的研究.研究结果表明:在输入信号频率为1 GHz时,倍频增益可以达到-23.4 dB,频谱纯度可以达到94%.研究了不同漏极偏压以及输入信号功率下倍频增益的变化特性,随着漏极偏压以及输入信号功率的增加,倍频增益增加.对具有不同跨导和电子空穴电导对称性的器件的倍频增益和频谱纯度随输入信号频率f_(in)的变化关系进行了研究.结果表明,跨导对于倍频增益影响显著,在f_(in)=1 GHz时器件的频谱纯度差别不大,均大于90%,但是随着f_(in)增加至4 GHz,电子空穴电导对称性较差的器件频谱纯度下降至42%,电子空穴电导对称性较好的器件仍能保持85%的频谱纯度.这是电子空穴电导对称性和电子空穴响应速度共同作用的结果.本文的研究结果对于高性能石墨烯倍频器设计具有一定的指导意义. 相似文献
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Rashmi 《Solid State Communications》2005,134(3):217-222
A detailed analysis of nonlinear effects-electron switching and rectification, in InAlAs/InGaAs based Y-branch junction (YBJ) devices is presented to investigate the potential of YBJ for high frequency applications at 300 K. Results based on semi-classical simulations yield good qualitative agreement with measurements and previously reported theoretical and experimental results. The nonlinear parabolic behaviour of our device is attributed to device geometry and space charge effects. RF analysis shows that the YBJ has tremendous intrinsic potential to function as a frequency doubler and microwave rectifier when operated in the parabolic regime. The present analysis serves as a tool to optimize the bias conditions for RF measurements and to estimate the effect of interconnects and parasitic elements on the RF performance of real devices. 相似文献
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Both vacuum-squeezed and bright amplitude-squeezed states of light are experimentally generated from a frequency doubler with a semimonolithic Fabry-Perot configuration consisting of a type II nonlinear crystal and a concave mirror. Vacuum squeezing of 3.2 +/- 0.1 dB and amplitude squeezing of 1.3 +/- 0.2 dB are obtained simultaneously at a pump power of 8 mW. The two quadrature-squeezed optical fields that are generated are of identical frequency at 1080-nm wavelength and orthogonal polarization. Optimizing the input pump power by 19 mW yields as much as 5.0 +/- 0.2 dB of maximum vacuum squeezing. The advantages of the system are its simplicity and multiple utility. 相似文献
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Tao Yang Ren Hou Liu Wei Gan Lin 《International Journal of Infrared and Millimeter Waves》2000,21(2):271-276
This paper describes a high performance W-band tripler with a novel structure. Input frequency is 25-36.7 GHz, output frequency 75-110 GHz, input power is 20dBm and conversion loss 16 dB. It can extend microwave signal to W-band (adding in Ka-band doubler). In the design, we give some approaches to achieve high band performances. 相似文献
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HIGH CONVERSION EFFICIENCY TANDEM KTP FREQUENCY DOUBLER 总被引:2,自引:0,他引:2
Xueiju SHEN Chunming LIU ^Optical Teaching Eesearching Section Ordnance Engineering Academy Shijiazhuaug ChinaZhongshu SHAO Enquan LIUCrystal Materials Besearch Institute Shandong University Jinan China 《Chinese Journal of Lasers》1992,1(1):61-65
The two-piece tandem KTP frequency doubler with mutually perpendi-oular KZ planes has been studied both theoretically and experimentally.Its conversionefficiency of second harmonic generation(SHG)exceeds 80% and the dynamic range ismuch greater than that of monolithic KTP doubler at the laser power used in theexperiments.The experimental result shows that this doubler has excellent performancesand the second harmonic beam is elliptically polarized. 相似文献
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We report the generation of a continuous-wave squeezed vacuum resonant on the Rb D1 line (795 nm) using periodically poled KTiOPO4 (PPKTP) crystals. With a frequency doubler and an optical parametric oscillator based on PPKTP crystals, we observed a squeezing level of -2.75+/-0.14 dB and an antisqueezing level of +7.00+/-0.13 dB. This system could be utilized for demonstrating storage and retrieval of the squeezed vacuum, which is important for the ultraprecise measurement of atomic spins as well as quantum information processing. 相似文献
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基于建立的不同工艺尺寸的CMOS器件模型,利用TCAD器件模拟的方法,针对不同工艺CMOS器件,开展了不同工艺尺寸CMOS器件单粒子闩锁效应(SEL)的研究。研究表明,器件工艺尺寸越大,SEL效应越敏感。结合单粒子闩锁效应触发机制,提出了保护带、保护环两种器件级抗SEL加固设计方法,并通过TCAD仿真和重离子试验验证防护效果,得出最优的加固防护设计。结果表明,90nm和0.13μm CMOS器件尽量选用保护带抗SEL结构,0.18μm或更大工艺尺寸CMOS器件建议选取保护环抗SEL结构。 相似文献
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M. Willemin N. Blanc G. K. Lang S. Lauxtermann P. Schwider P. Seitz M. Wny 《Optics and Lasers in Engineering》2001,36(2)
The accurate measurement of the optoelectronic properties of imaging sensors is of utmost importance for their appropriate use in various modern application fields, such as in metrology, quality control, environmental monitoring, medicine or for automotive applications. Key sensor parameters include spatial resolution, uniformity, sensitivity, linearity, signal to noise ratio and dynamic range. Today high-end optical systems mostly rely on charge coupled device (CCD) image sensors. Continuous progresses in CMOS submicron technology and the advent of ‘active pixel sensor’ (APS) imagers have however led to a wealth of novel line and area array imaging devices with added functionalities (eg. on-chip control and read-out electronics) or performance optimized for specific tasks (eg. a dynamic range in excess of 120 dB). The optimal use of CMOS image sensing technology nevertheless depends strongly on the absolute and accurate optoelectronic characterization of these devices. Modern measurement techniques for a reliable, traceable, precise and absolute measurement of the most relevant parameters of CCD and CMOS imaging sensors are described and discussed in the present paper, with examples based on recent state-of-the art CMOS imagers. 相似文献
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A known algorithm for modeling quasi-periodic lattices is used to generate two-dimensional quadratic nonlinear photonic quasi-crystals containing a set of desired discrete spectral components. This allows us to fabricate optical devices in which an arbitrary set of nonlinear optical processes can be efficient. We demonstrate this capability by fabricating two devices: a multidirectional single-frequency doubler and a multidirectional, multifrequency doubler that is capable of nearly collinear doubling of cw radiation in the optical communication C band (1530-1570 nm) through angle tuning. 相似文献
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Dezhong Shen Guangqiu Shen Xiaoqing Wang Xiaoyang Wang 《Optics & Laser Technology》2002,34(4):277-281
The ordinary method to cut two light pass surfaces of an optical device in Brewster angle parallelly cannot reduce the harmonic's reflective losses of a laser frequency doubler. Right cut method with two unparallel light pass surfaces of Brewster angle of a laser frequency doubler, and preliminary experiment to demonstrate the usefulness of the technique are given. 相似文献
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Jyrki T. Louhi Antti V. R?is?nen 《International Journal of Infrared and Millimeter Waves》1997,18(11):2063-2075
A frequency doubler for 200 GHz utilising a planar surface channel Schottky varactor was designed, constructed and tested.
The doubler employes novel split-waveguide mount design with two sliding backshorts at both input and output waveguides. The
theoretical maximum efficiency of the doubler is 44.0 % with input power level of 32 mW and the maximum output power is 16.5
mW with input power level of 50 mW. The measured maximum efficiency of the doubler was 7.1 % and the maximum output power
was 2.6 mW 相似文献
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Soorena Zohoori 《Fiber and Integrated Optics》2018,37(1):37-56
In this paper, a new low-power optical receiver front-end is proposed in 90 nm CMOS technology for 5 Gb/s AApplications. However, to improve the gain-bandwidth trade-off, the proposed Trans-Impedance Amplifier (TIA) uses an active modified inverter-based topology followed by a common-source amplifier, which uses active inductive peaking technique to enhance the frequency bandwidth in an increased gain level for a reasonable power consumption value. The proposed TIA is analyzed and simulated in HSPICE using 90 nm CMOS technology parameters. Simulation results show a 53.5dBΩ trans-impedance gain, 3.5 GHz frequency bandwidth, 16.8pA/√Hz input referred noise, and 1.28 mW of power consumption at 1V supply voltage. The Optical receiver is completed using three stages of differential limiting amplifiers (LAs), which provide 27 dB voltage gain while consume 3.1 mW of power. Finally, the whole optical receiver front-end consumes only 5.6 mW of power at 1 V supply and amplifies the input signal by 80 dB, while providing 3.7 GHz of frequency bandwidth. Finally, the simulation results indicate that the proposed optical receiver is a proper candidate to be used in a low-power 5 Gbps optical communication system. 相似文献