共查询到20条相似文献,搜索用时 62 毫秒
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基于IBM 0.18 μm SOI CMOS工艺,设计了一款用于WLAN的高效率CMOS功率放大器。为了提高电路的可靠性,该放大器的驱动级和输出级均采用自适应偏置电路,使得共栅管和共源管的漏源电压分布更为均衡。该芯片采用两级共源共栅结构,片内集成了输入匹配电路和级间匹配电路。测试结果表明,该放大器的增益为23.9 dB,1 dB压缩点为23.9 dBm,效率为39.4%。当测试信号为IEEE 802.11g 54 Mb/s,在EVM为3%处,输出功率达到16.3 dBm。 相似文献
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基于TSMC 0.13 μm CMOS工艺,设计了一款适用于无线保真(WiFi)收发机的发射端、工作在2.4 GHz且增益可控的三级级联功率放大器.驱动级采用单管结构,后两级采用共源共栅(MOSFET)结构.利用调节共源共栅晶体管栅极的电容来改变栅极电压的相位,进而弥补了共源共栅结构的劣势,增加了整个系统的线性度和增益.另外,使用外部数字信号控制每级偏置的大小来适应不同的输出需求.整个结构采用电源电压:第一级为1.8V,后两级为3.3V,芯片面积为1.93 mm×1.4 mm.利用Candence Spectre RF软件工具对所设计的功率放大器进行仿真.结果表明,在2.4 GHz的工作频点,功率放大器的饱和输出功率为24.9 dBm,最大功率附加效率为22%,小信号增益达到28 dB. 相似文献
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随着CMOS工艺的发展,器件尺寸逐渐缩小,短沟道效应的影响日益突出。共源共栅电流源可以很好地抑制小尺寸效应,但其消耗的电压余度较大,偏置电路设计繁琐。因此介绍了一种采用自偏置低压共源共栅电流源的带隙基准电路结构,用两个电阻代替了偏置电路。仿真结果显示,该带隙基准电路的最低电源电压约为2.98V,相对于普通的共源共栅结构,降低了2个MOSFET阈值电压;工作在最低电源电压下,功耗约为270μW,相对于带偏置电路的结构,降低约75μW。仿真结果证明,该电路能够简化共源共栅电路的设计和调试,并减少低压共源共栅电路的功耗。 相似文献
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采用国产40 nm CMOS工艺,设计了一种用于5G通信的28 GHz双模功率放大器。功率级采用大尺寸晶体管,获得了高饱和输出功率。采用无中心抽头变压器,消除了大尺寸晶体管带来的共模振荡问题。在共源共栅结构的共栅管栅端加入大电阻,提高了共源共栅结构的高频稳定性。采用共栅短接技术,解决了大电阻引起的差模增益恶化问题。在级间匹配网络中采用变容管调节,实现了双模式工作,分别获得了高功率增益和高带宽。电路后仿真结果表明,在高增益模式下,该双模功率放大器获得了20.8 dBm的饱和输出功率、24.5%的功率附加效率和28.1 dB的功率增益。在高带宽模式下,获得了20.6 dBm的饱和输出功率、22.6%的功率附加效率和12.2 GHz的3 dB带宽。 相似文献
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采用0.6μm DPDM工艺,设计出一款在静态功耗、失调电压、输出摆幅、输出功率、THD、速度和带宽等各方面性能都比较优良的AB类CMOS输出运算放大器,其主要应用于音频功放芯片。采用推挽式功率管输出,其主体部分采用折叠式共源共栅差分电路结构,偏置部分采用外部电流源供电,并使用共源共栅电流镜结构。供电电压为3~5 V,在5 V下的静态功耗为6 mW。能驱动32Ω耳机,其最大输出功率是90 mW。仿真结果表明,电路性能优良。 相似文献
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设计了一种低温漂系数的共源共栅CMOS带隙基准源,采用自偏置共源共栅结构,提高了电路的电源抑制比,降低了电路的工作电源电压。采用不同温度下从输出支路抽取不同值电流的电路结构,在低温段抽取一个正温度系数电流,在高温段再注入一个较小值的正温度系数电流,达到降低温漂系数的目的。在0.5 μm CMOS工艺下,Cadence Spectre电路仿真的结果表明,温度特性得到了较大改善,在-35℃~125℃温度范围内,带隙基准源的温漂系数为1.5 ×10-6 /℃,电源抑制比为65 dB。 相似文献
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Meihua Shen Wilfred Pau Nicolas Gani Jianping Wen Shashank Deshmukh Thorsten Lill Jian Zhang Hanming Wu Guqing Xing 《半导体技术》2004,29(8)
This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration. 相似文献
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White organic light-emitting devices based on fac tris(2- phenylpyridine) iridium sensitized 5,6,11,12-tetraphenylnap -hthacene 总被引:1,自引:0,他引:1
We have fabricated the white organic light-emitting devices (WOLEDs) based on 4,4' -bis(2,2 -diphenyl vinyl)-1,1' - biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene (rubrene). The device structure is ITO/2T-NATA (20 nm)/NPBX (20 nm)/CBP: x%Ir(ppy)3:0.5% rubrene (8 nm)/NPBX (5 nm)/DPVBi (30 nm)/Alq(30 nm)/LiF(0.5 nm)/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)3], acts as a yellow light-emitting layer, and N,N' -bis- (1-naphthyl)- N,N' -diphenyl -1, 1' -biphenyl-4,4' -diamine (NPBX) acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir (PPY)3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V. 相似文献
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Complete approach to automatic identification and subpixel center location for ellipse feature 总被引:1,自引:0,他引:1
XUE Ting WU Bin SUN Mei YE Sheng-hua 《光电子快报》2008,4(1):51-54
To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction. 相似文献
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In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal (200) (2d = 0.4027 nm) is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line(w), the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line(x), the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines(y), the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line(z) in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line(q) in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution(λ/△ 2) is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy. 相似文献
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High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET > PDMAT > TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center. 相似文献
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Credence Systems Corporation 《半导体技术》2004,29(9)
Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V. 相似文献
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This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors. 相似文献
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YUXiao-hua XIANGYu-qun 《半导体技术》2005,30(2):30-32,37
An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB. 相似文献
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It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer (LDV). 相似文献