新型长脉冲超高效放大器Magnicon研究

文章简述了Ｍａｇｎｉｃｏｎ磁旋管的来源和发展过程，概述了它的原理。磁旋管放大器使用直圆柱谐振腔。本文从腔内旋转ＴＭ（ｎ１０）场的表达式出发，给出了谐振腔的欧姆损耗功率、冷Ｑ等的计算公式。它与现有的静态ＴＭ（ｎ１０）模场的相应公式不同，而后者目前仍被用于磁旋管的设计。文章从电子动力学方程出发，求得无源磁偏转腔的电子速度和位置解（位置与现有的不同），求得偏转腔中电子束与波的相互作用瞬时功率解。文中还给出输出腔柱坐标系的能量动力学方程，输出腔末端参数公式的相对论修正系数，以补充现有的非相对论公式。     

新型长脉冲超高放大器Magnicon研究

文章简停了Ｍａｇｎｉｃｎ磁旋管的来源和发展过程，概述了它们的原理。磁旋管放大器使用直圆柱谐振腔，本文从腔内放置ＴＭｎ１０场的表达式出发，给出了谐振腔的欧姆损耗功率，冷Ｑ等的计算公式。它与现有的静态ＴＭｎ１０模场的相应公式不同，而后者目前仍被用于磁旋管的设计。     

红外与毫米波学报J．InfraredMillim．Waves第十三卷年度索引

红外与毫米波学报Ｊ．ＩｎｆｒａｒｅｄＭｉｌｌｉｍ．Ｗａｖｅｓ第十三卷年度索引（一九九四年）关键词索引表面效应一线性和非线性静磁表面波能流的受控偏转特性（１３１）波导－线性和非线性静磁表面波能流的受控偏转特性（１３１）－金属包层平面光波导偏振器和在线单...     

偏转单元的磁散逸场研究

测试和分析了计算机用显示器(CDTs)的磁散逸场,测量了不同类型的CDTs在不同工作频率及不同工作条件下的磁散逸场。参与测试的CDTs包括两个48cm的带有不同偏转单元(分别为双贝型偏转单元和鞍鞍型偏转单元)的CDTs。测试和分析结果表明磁散逸场与显示器的工作频率关系不密切,而与屏蔽方式和屏蔽材料关系密切。为了找到简单的方法来减小偏转单元的磁散逸场,本文还做了一系列的实验。实验结果表明,选择导磁材料制作的屏蔽罩能有效地减少磁散逸场的外溢。     

OmniStar 1550nm光发射机、光放大器技术指标

ＯｍｎｉＳｔａｒ１５５０ｎｍ光发射机、光放大器技术指标周义１ＯｍｎｉＳｔａｒ１５５０ｎｍ光发射机技术指标ＡＭ－ＯＭＮＩ－１５５０－ＬＭ／ＳＤ链路指标＊单位７７ＮＴＳＣ６０ＮＴＳＣ４０ＮＴＳＣ６０ＰＡＬＢ／ＧＣＮＲｄＢ５１５２５３．５５０．５ＣＳＯｄＢ...     

磁旋管（综述）简介

(接 2 0 0 0第 6期第 1 2页 )4　动力学理论参考资料 [2 ]和 [3]由动力学理论获得一些计算公式 ,可用于磁旋管各部分的设计计算。有些公式可能有误 ,请使用时详细推导一下。4.1　偏转系统磁旋管中电子注的圆偏转由激励 TM110 振荡的圆柱腔的 RF磁场实现。TM110 的场结构如图 2所示。因为需要得到大的偏转角引起增益下降和电子能量散开 ,采取纵向磁场克服了这个缺点。电子运动旋转方向应和 RF场一致。在小偏转角近似下可得解释解。假设βz=β0 =常数 ,γ=γ0 =常数 ,在迪卡尔坐标系中有 :dvxdt=- emγ[vx Bz- vz By]dvydt=- emγ[vz Bx-…     

光偏振的微小旋转角的测量技术

本实验提供一种对光偏振的微小旋转角的测量技术、实验采用法拉第调制方法,分别用６３２．８ｎｍ的Ｈｅ－Ｎｅ激光器和５３２ｎｍ的ＬＤ泵浦固体激光器做测量光源,对乙醇水溶液（浓度５０％）的磁光法拉第偏振角进行测量,当改变外加磁场的磁感应哟度时,可使偏转角在亚毫度范围内取值,采用这一技术,对蔗糖水溶液的旋光角进行测量,浓度低达每毫升１０＾４克,为具有小的常德常数的化学物质或生命物质地旋光测量提供了很好的手段     

使用电偏转的高增益偏转调制微波放大器

现有的偏转调制放大器(偏调管)一般都是低增益(小于25分贝)并利用磁场进行偏转。在本文中,我们考虑用电子偏转并采用由几个更普通的非耦合腔体构成偏转系统。这可使增益有明显的增加(可与速调管相比拟),并且不再需要像原先在磁偏调放大器中所用的、体积庞大的直流偏转磁铁。试验了两种不同类型的电偏转腔体。测出了许多腔体中的偏转阻抗和场分布。测量表明,电偏转腔体所具有的有效偏转阻抗要比磁偏转腔体大5～50倍。文中研究了依据相对论电子束公式的多腔偏转理论和麦克斯韦场方程的一阶展开式。由计算机计算得到的大量数据表明,采用多腔偏转系统的高增益偏转调制高频放大器是可行的。三腔器件的典型增益达50～55分贝。     

中国磁光盘产业的发展

通过比较磁光盘与磁盘，ＣＤ－ＲＯＭ和ＣＤ－Ｒ光盘的主要指标，指出磁光盘的优势和巨大的市场潜力，阐述了磁光盘产业化发展的必要性和可行性，提出了种种设想，以使我国的磁光盘产业迅速走上高速发展展之路。     

NICAM-728解码器平衡输出变换

ＮＩＣＡＭ－７２８解码器平衡输出变换□刘建忠（河北省平泉县广播电视局０６７５００卫星电视广播ＮＩＣＡＭ－７２８数字声解码器，能够从卫星电视信号中解调出广播节目的音频信号，输出的是６０Ω平衡信号。如果需要６０Ω不平衡信号，最简单的办法，就是使用一只变压...     

The Axially Modulated, Cusp-Injected, Slowly Varied Section Opened Cavity, Magnicon Amplifier

I introduce a novel hybrid microwave amplifier that utilizes the axial bunching mechanism of klystrons in conjunction with the energy extraction mechanism of cyclotron resonance masers on TM mode. A simpler analytic model is used to show the viability of the device configuration and to explore limitations of the scheme. An example of an 11.5 GHz, fourth harmonic amplifier is presented. Adopting a multi-particle in azimuth range of (0, π/2) whose divide thickness of beam into three share approach, numerical simulation are used to demonstrate bunching in physical space and to estimate system efficiency et al. It shall be shown that this configuration enables the design of eficient, high harmonic devices over a wide range of parameters. Magnicon [1]-[11] is a kind of microwave amplifier tabe, it operates on the mode of rotating E_n10 in cylindrical cavity and there is solid focus fine electrons beam. In it from theory, the paper researches the new type magnicon, it is changed into using annular electron beam and using slowly variable section opened cavity. Compared with magnicon, its pervence beams will may be increased, its frequency may be increased up to millimeter wave band, its bandwidth also will may be increased same times. Than model of new type magnicon is put forward. Starting from large signal's theory, interacting of the annular electron beam into driver cavity in between the mode of rotating E_n10, numerical value to simulate. It done on the small current density and small density of electron in space that electrons dynamic are simulated, which may uses Runge-Kutta method to do it.     

Analysis for the new type long-pulsed and high efficient microwave amplifier—magnicon

This paper begins with the cylindrical cavity field expression of the rotating TM_n10 mode in magnicon, and obtains its dissipated power, cold quality formula and so on, which are different from those in the static state TM_n10. Furthermore starting from the dynamics equations, the passive deflect cavity electron velocity and position solution, as well as the interact instantaneous power solution between electron and wave have been solved. The cylindrical coordinate electron energy dynamics equation in the output cavity, and the modification of terminal parameter formula for relativity have also been discussed.     

A 1.1 GHz Fifth Order Active-LC Butterworth Type Equalizing Filter

This paper describes architectural and design considerations for low power, GHz range wideband low-pass active filters. A series LC resonator based biquad is proposed and its power efficiency is shown to be over 7 times better than an equivalent Gm-C biquad. Reduced number of active elements and readily available bandpass and low-pass signals make this topology particularly suitable for efficient realization of equalizing functions. Also demonstrated is a common-mode feedback scheme that allows for a stable, high accuracy common-mode control with loop bandwidth which can exceed twice the filter's bandwidth. A fifth order active-LC Butterworth filter prototype is fabricated in a standard 0.18 CMOS technology. It provides a bandwidth of 1.1 GHz and features equalization gain programmable over a 0-23 dB range. It is experimentally verified to achieve 47 dB SNR and 48 dB IM3 with 250 mVpp swing while consuming 72 mW of power.     

应用于4G-LTE无线通信系统的F类高PAE射频功率放大器

为了有效实现高谐波抑制并提高功率附加效率,提出了一种适用于4G-LTE无线通信系统的高效F类功率放大器。该功率放大器使用了低电压p-HEMT晶体管和小型微带抑制单元,能够在低射频输入功率下产生n次谐波抑制和较高的功率附加效率（power added efficiency,PAE）。采用谐波平衡法对提出的功率放大器进行了仿真分析,并对其进行了实际制造。通过实际测量对仿真结果进行了验证。测量结果显示,提出功率放大器的工作频率为1.8 GHz,带宽为100 MHz,平均PAE为76.9％,且具有2V的极低漏极电压。射频输入功率范围分别为0-12 dBm时,最大输出功率和增益分别为23.4和17.5 dBm。     

A New Topology With High Efficiency Throughout All Load Range for Photovoltaic PCS

In this paper, a new topology is proposed that can significantly reduce the converter rated power and increase the efficiency of total photovoltaic (PV) system. Since the output voltage of PV module has very wide operating range, in general, the DC/DC converter is used to produce constant high-DC-link voltage for DC/AC inverter. According to the analysis of the proposed topology, only 20% of total PV system power is processed by the DC/DC power conversion stage. The DC/DC power conversion stage used in proposed topology has flat efficiency curve throughout all load range and very high efficiency characteristics. In the proposed topology, because the converter efficiency curve is almost flat throughout all load range, the total system efficiency at light load is dramatically improved. The proposed topology is implemented for 250-kW power conditioning system. This system has only three DC/DC power conversion stage with 24-kW rated power. It is only one-third of total system power. The experimental results show that the proposed topology has good performance.     

基于功率MOS线性高压放大器设计

为了实现时输出高压的线性控制,基于功率MOSFET的电学特性,运用NMOS功率管设计一种新结构的高压运算放大器,通过模拟仿真和实验测量结果表明,当输入电压为0～5V时,电路可实现0～50V的线性输出,并且通过加入PMOS功率管进一步改进电路,可得到正负高压的输出,模拟仿真为-140～＋140V,这表明所设计的电路线性度高,可以满足高压运放的要求,且制作成本低,对现代通信中的大功率驱动具有重要意义。     

A Technique for Extending the Dynamic Range of the Dual Six-Port Network Analyzer

The dynamic range of the six-port type of automatic network analyzer is typically limited to measuring two-port devices with a transmission coefficient S/sub 12/ in the range of 0 to -60 dB. The following describes a subcarrier approach for extending the dynamic range of the dual six-port network analyzer. The subcarrier is generated by inserting a 10-kHz, biphase modulator ahead of one of the six-ports. With the subcarrier approach, measurements of S/sub 12/ in the range of -60 to -100 dB can be made. Test results are presented showing measurements of S/sub 12/ =-80 db with a precision of +-0.05 dB or better, and an accuracy of +-0.16 dB or better at 3 GHz. Measurement results are also presented showing the dynamic range achievable with thermistor and barretter detectors. Key Words: barretter power detectors; diode power detectors; impedance measurements; microwave network analyze; six-port network analyze; thermistor power detectors.     

Premature collection mode in IMPATT diodes

Experimental efficiencies of up to 35.5 percent have been reported for Read-type GaAs diodes, whereas theoretical calculations have predicted an upper limit of approximately 30 percent for the conversion efficiency of IMPATT diodes. The concept of a premature collection mode is shown to resolve this discrepancy by predicting maximum efficiencies close to 40 percent. Premature collection refers to large-signal conditions where the modulation of the drift width is sufficiently large to result in collection of the avalanche current pulse at drift angles smaller than the small-signal angle. It is shown that a discontinuous transition between the IMPATT and the premature collection modes takes place when the drift angle in the small-signal limit is greater than π. Designing the diode for close to punchthrough conditions in small-signal operation extends the practical frequency range for inducing premature collection by avoiding long drift angles and corresponding rapid conductance saturation in the IMPATT mode. The onset of premature collection is accompanied by a substantial increase in power output because of a more favorable drift angle, and in high noise because of the high RF levels involved. The jump in transit angle causes a discontinuous increase in negative conductance. The hysteresis in the tuning characteristic resulting from this discontinuity has been observed experimentally. Noise measures in the range 60-70 dB have been measured and calculated for the premature collection mode compared to 40-50 dB under large-signal conditions for the IMPATT mode. Therefore, the high efficiencies available with the premature collection mode are expected to be usable only in applications where high noise levels can be tolerated.     

应用于无源UHF RFID传感器接口的低功耗低压转换器设计

为了增加射频识别（RFID）传感器的识读范围,针对无源超高频（ultra high frequency,UHF）RFID标签的传感器接口,提出了一种新的低功耗低压时间数字转换器设计。该传感器接口采用基于游标原理的高效时数转换器,在保证分辨率和转换效率的同时,能够实现较低的功耗和较大的动态范围。采用TSMC 90nm标准CMOS技术设计并制造。测量结果显示相比其他类似结构,提出接口在输入时间范围28.18-42.94 时有效分辨率为10.48bits。采样率为20 KS/s时,转换器转化效率为0.396 pJ/bit,且功耗和电压供应分别仅为3.84 和0.6V,能够有效增强无源UHF RFID压力传感器标签的识读范围。