A 5 GHZ CMOS Power VCO with Novel Frequency-Modulation for RF Transmitter

A 5 GHz transformer-feedback power oscillator with novel frequency modulation (FM) up to 10 MHz is presented in this paper. The novel FM is achieved by a CMOS transistor between transformer and ground, which is designed for varying the equivalent inductance and mutual inductance of the transformer and shows no DC connection with the oscillation circuit. The major frequency tuning is realized by the variable capacitor which is controlled by a phase lock loop. The RF VCO with 210 MHz tuning range operates in class-E mode to achieve a cost-effective transmitter, which demonstrates a high DC-to-RF conversion efficiency of 39 %. A RF power of 15.1 dBm and phase noise better than \(-\) 109 dBc/Hz @ 100 kHz from the central frequency of 5.5 GHz is obtained with the biasing conditions V \(_\mathrm{ds}\) = 1.8 V and V \(_\mathrm{gs}\) = 0.65 V. The VCO also demonstrates an ultra-low voltage operation capability: with V \(_\mathrm{ds}\) = V \(_\mathrm{gs}\) = 0.6 V and DC power consumption of 9 mW, the output power is 4.5 dBm and the phase noise better than \(-\) 93 dBc/Hz @ 100 kHz. The die size of the transformer-feedback power oscillator is only \(0.4\times 0.6\) mm \(^{2}\) .     

Power Factor Characterization of Ge/SiGe Thermoelectric Superlattices at 300 K

To accurately characterize the efficiency of thermoelectric materials and characterize the maximum power that they can produce, a device using micro/nanofabrication techniques has been developed, enabling all three properties included in the figure of merit, ZT, of a thermoelectric material to be measured using a single device. The fabrication and testing of the device are presented. The electrical conductivity and Seebeck coefficient of Ge/SiGe heterostructures grown by low-energy plasma-enhanced chemical vapor deposition are used for demonstration. Experimental results as a function of quantum well width are presented, demonstrating power factors up to 6.02 ± 0.05 mW m^?1 K^?2 at 300 K. Modeling and physical characterization demonstrate that these results are presently limited by high threading dislocation density.     

Power MOSFET系列

Toshiba公司推出了一系列新的功率MOSFET产品,主要用于优化汽车中使用的风机、泵以及其他汽车运动控制应用。新MOSFET系列将导通电阻、输入电容以及封装 设计组合在一起，比以前的汽车MOSFET提供更好的散热和功率性能。     

The Power Stripe

编辑部的恬恬MM经常抱怨家里的插线板不够用，明明看着能插上5样东西，可手机、数码相机的充电器往上一放，再加老爸的剃须刀，就再也挤不下别的了。这可怎么办呢？     

GaAs Power Devices

The R &D of Ga As power PHEMT s have been done in Nanjing Electronic DevicesInstitute in 2 0 0 0 .WC2 0 0 3high electron mobility power transistors and Ku- band 1 0 Wpower PHEMT have been completed.The WC2 0 0 3delivers greater than 2 .5W outputpower with greater than9.5d B power gain and lower than± 0 .5d B gain deviation and40 %typical power- added efficiency ( PAE) across the band of 9.4～ 9.9GHz.The gate width ofWC2 0 0 3is4.8mm.The developed Ku- band interbakktmatched power…     

实力派Power allocation

在人们一味追求笔记本电脑更轻、更薄、更强的同时,也有一类笔记本电脑反其道而行之。它们放弃了原本笔记本电脑易便携、长时间待机的特点,而将高清的超大屏幕和相比DIY台式电脑也毫不逊色的性能集于一身。在它们面前,1080p高清视频和设置全屏抗锯齿来玩游戏不过是小菜一碟     

Cirque Power Cat——Power Cat取代鼠标

我们一直很喜欢触摸板这种想法,但在我们试用Cirque的GlidePoint TouchPad2以前,其早期产品却没有给我们留下什么深刻印象。Cirque公司新的Power Cat比前述产品又有了很大进展。售价79美元的这种5.5×4.4×1英寸(高宽深)输入设备提供了很高的响应速度以及大量附加功能。我们对该产品的正式版本进行了测试。 Power Cat的工作方式与其它触摸板相同:将手指放在该触摸板的表面,然后通过轻敲和滑动手指来移动屏幕上的光标并进行选择。但是您的手指放在Cat上的位置决定了您要进行的操作:轻敲该触摸板     

Static Performance of 20 A, 1200 V 4H-SiC Power MOSFETs at Temperatures of −187°C to 300°C

Silicon carbide (4H-SiC) power metal–oxide–semiconductor field-effect transistors (MOSFETs) have been attracting tremendous attention for high-power applications at a wide range of operating temperatures, owing to their normally-off characteristics, high-speed switching operation, avalanche capability, and low on-resistance. To optimize performance of 4H-SiC MOSFETs for various applications at different temperatures, it is important to understand the mechanisms of temperature dependence of the key parameters, such as on-resistance, threshold voltage, and metal–oxide–semiconductor (MOS) channel mobility. We report on the temperature dependence of the on-resistance of 20 A, 1200 V 4H-SiC power MOSFETs for temperatures ranging from −187°C to 300°C. The MOSFET showed normally-off characteristics throughout the entire experimental temperature range. Different temperature dependences of the total on-resistance in different temperature regimes have been observed. Due to the poor MOS channel mobility and the low free carrier concentration in the inversion channel of the 4H-SiC MOSFET, the MOS channel resistance is the dominant part of the total on-resistance. This was also found to be true in a 4H-SiC long-channel lateral MOSFET.     

基于 GSVD 的分布式 MIMO 雷达测向算法

针对分布式多输入多输出（multi-input multi-output, MIMO）雷达测向中存在的数据信息提取不充分、运算量偏大等问题，开展了基于广义奇异值分解（generalized singular value decomposition, GSVD）的测向算法研究，以提高低信噪比条件下的角度估计性能。首先，建立了分布式阵列MIMO雷达回波信号的统一化表征模型；其次，将分布式MIMO雷达系统接收阵列数据的多线程GSVD问题转换为一个联合优化问题，运用交替最小二乘（alternating least squares, ALS）技术实现阵列信号流行矩阵的拟合，并引入子空间类算法实现目标角度联合估计；最后，对优化问题增加l1范数约束，避免了每次迭代中进行的奇异值分解运算，降低了算法运算量。仿真实验从角度联合估计、均方误差、运算时间等方面验证了所提算法的有效性。     

不断改进的Power PC

日前,IBM和摩托罗拉半导体部今天宣布推出先进的PowerPC~(TM)微处理器,向其系统用户提供具有新的更高性能的器件。新款微处理器是采用下一代工艺技术制造的。它包括: 新的设计技术-PowerPC~(TM)750/740微处理器采用最新的先进设计技术,仅使用了现今市场上大多数处理器的一小部分功耗,就具有了更高的性能。 新工艺-PowerPC 604e处理器速度高达350MHz,     

Torus Power TOT系列

TOT系列中的TOT Mini和TOT Max是加拿大“电源之王”Torus Power最新推出的入门级发烧电源处理器,专为中小功率的发烧音响及影音系统提供安全、稳定、强大能量的电源供应。TOT系列的电源处理器使用了Plitron公司多项环形变压器专利技术,可有效隔离2千至1百万赫兹的电源噪音,同时具有防浪涌抑制模式,防止雷击等对器材的毁灭性伤害,而且其激发特性能为器材提供瞬间大电流的供应,是目前市面极少数能连接后级而没有压缩的电源处理器。TOT系列电源处理器还额外提供一组USB供电,可为发烧友的USB取电器材提供优质的电源供应。TOT Mini可为总功率700W(6位插座)的影音系统服务,TOT MAX（8位插座）可为总功率1800W的影音系统服务。     

Power定义下一代应用服务器

IBM将工业标准的Linux系统运行于Power Systems平台之上,使Linux拥有了Power平台的RAS特性,并兼具经济的使用成本,既是对Power产品线的有益补充,也为下一代应用服务器定义了新标准。当前时代,越来越多的海量数据正向我们扑面而来。在云、社交、移动、大数据等趋势与新需求影响下,IT基础设施不断应需而变,如何实现更加灵活、更加可靠、更易管理的IT基础架构解决方案?作为其中关键的     

宏基 Power Sx系列

宏基Power Sx整机外观采用全白色设计,立式机箱,稍带有弧线的前面板,给用户紧张的工作中带来一点轻松的感觉。PowerSx系列商用机标准配置采用CELERON 633/700MHz或Pentium Ⅲ-800/866MHz的处理器,系统配有64MB PC-133SDRAM内存,并且最高可以扩充到512M内存。该系列商用机的主板上均已内置了AGP 4X显示图形控制器和AC 97 3D声卡,可以完成各项多媒体工作。该系列同时配有     

Current-Mode Universal Biquadratic Filter with Five Inputs and Two Outputs Using Two Multi-Output CCIIs

A current-mode universal biquadratic filter with five input terminals and two output terminals is presented. The proposed circuit uses two multi-output second generation current conveyors, two grounded capacitors and three resistors. The new circuit offers the following advantages: use of the minimum number of active components, orthogonal controllability of resonance angular frequency and quality factor, use of grounded capacitors and the versatility to synthesize any type of active filter transfer functions.     

Continuously Frequency Tunable High Power Sub-THz Radiation Source—Gyrotron FU CW VI for 600 MHz DNP-NMR Spectroscopy

A high frequency gyrotron with a 15 T superconducting magnet named Gyrotron FU CW VI has achieved continuous frequency tuning through the relatively wide range of 1.5 GHz near 400 GHz. The operation is at the fundamental cyclotron resonance of the TE₀₆ cavity mode with many higher order axial modes. The output power measured at the end of the circular waveguide system ranges from 10 to 50 watts at the low acceleration voltage of 12 kV for beam electrons. The beam current is also low. It is around 250 mA. This gyrotron is designed as a demountable radiation source for the 600 MHz DNP-NMR spectroscopy. The design and operation results of the gyrotron FU CW VI are presented.     

Interference Studies Between Adjacent Satellite Communications Systems operating Above 10 GHz and Using Power Control as Fade Mitigation Technique

Interference problems are arising from the spectral coexistence between satellite communication networks that operate at frequencies above 10 GHz and particularly when they employ power control as fade mitigation technique. This situation is aggravated due to tropospheric propagation phenomena. In this frequency range, rain attenuation is considered to be the dominant tropospheric fading mechanism. The conditional acceptable intersystem interference probability of the Carrier-to-Interference Ratio of a satellite terminal interfered by an adjacent satellite network is defined as a figure of merit and analytically calculated taking into account a physical-mathematical model for the rainfall medium. The correlated propagation fading phenomena over multiple slant paths are accurately incorporated. The proposed model is flexible and can be applied on a global scale since it incorporates the local climatic conditions concerning the point rainfall rate and the spatial rainfall inhomogeneity. Useful numerical results of the proposed model are obtained and the impact of various crucial operational and geometrical parameters of satellite networks’ coexistence is examined. The numerical results have been also verified through simulations using a multi-dimensional rain attenuation synthesizer. Finally, simple and easy-calculated formulas for the satellite communication designers for back of the envelope computations are given.     

An Analysis of the Blockcipher-Based Hash Functions from PGV

Preneel, Govaerts, and Vandewalle (1993) considered the 64 most basic ways to construct a hash function $H{:\;\:}\{0,1\}^{*}\rightarrow \{0,1\}^{n}Preneel, Govaerts, and Vandewalle (1993) considered the 64 most basic ways to construct a hash function H:   {0,1}^*? {0,1}ⁿH{:\;\:}\{0,1\}^{*}\rightarrow \{0,1\}^{n} from a blockcipher E:   {0,1}ⁿ×{0,1}ⁿ? {0,1}ⁿE{:\;\:}\{0,1\}^{n}\times \{0,1\}^{n}\rightarrow \{0,1\}^{n}. They regarded 12 of these 64 schemes as secure, though no proofs or formal claims were given. Here we provide a proof-based treatment of the PGV schemes. We show that, in the ideal-cipher model, the 12 schemes considered secure by PGV really are secure: we give tight upper and lower bounds on their collision resistance. Furthermore, by stepping outside of the Merkle–Damg?rd approach to analysis, we show that an additional 8 of the PGV schemes are just as collision resistant (up to a constant). Nonetheless, we are able to differentiate among the 20 collision-resistant schemes by considering their preimage resistance: only the 12 initial schemes enjoy optimal preimage resistance. Our work demonstrates that proving ideal-cipher-model bounds is a feasible and useful step for understanding the security of blockcipher-based hash-function constructions.     

Power Quality im Übertragungsnetz

Ohne Zusammenfassung Kurzfassung eines Vortrags, gehalten anl?sslich der 39. Fachtagung der ?sterreichischen Gesellschaft für Energietechnik im ?VE, die am 18. und 19. Oktober 2001 in Salzburg stattfindet.