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conSTant

  • a MATLAB program which reads files defining a piecewise conSTant triangulation of data, and displays

    a MATLAB program which reads files defining a piecewise conSTant triangulation of data, and displays a corresponding 3D surface.

    标签: triangulation piecewise defining conSTant

    上传时间: 2014-11-14

    上传用户:黄华强

  • 盲自适应算法--递推最小二乘恒模算法Recursive Least Squares conSTant Modulus Algorithm for Blind Adaptive Array

    盲自适应算法--递推最小二乘恒模算法Recursive Least Squares conSTant Modulus Algorithm for Blind Adaptive Array

    标签: Recursive Algorithm conSTant Adaptive

    上传时间: 2014-06-30

    上传用户:helmos

  • how to add arrays * Use of const (conSTant) values. * Creation of vectors. * Passing

    how to add arrays * Use of const (conSTant) values. * Creation of vectors. * Passing vectors as function arguments. * Reading from files of unknown size (monitoring istream status). * Repetitive structures (while and for loops). * The increment operators (++). * Selection structures (if-else statements). * Use of the .size, .empty, .begin, .insert, .erase, .resize, .clear and .swap vector class member functions.

    标签: Creation conSTant Passing vectors

    上传时间: 2017-04-25

    上传用户:1079836864

  • Tis is the code for conSTant modulus algorithm for blind equalization

    Tis is the code for conSTant modulus algorithm for blind equalization

    标签: equalization algorithm for conSTant

    上传时间: 2014-02-12

    上传用户:225588

  • TP4054独立线性锂离子电池充电器采用SOT热调节

    The TP4054 is a complete conSTant-current/conSTant-voltage linear charger for single celllithium

    标签: 4054 SOT TP 独立

    上传时间: 2013-07-27

    上传用户:bruce

  • A706高压升压驱动器带有6通道恒电流调节器

    The A706 series is a high voltage Boost driver with 6 channels adjustable conSTant current regula

    标签: A706 升压驱动器 恒电流 调节器

    上传时间: 2013-06-09

    上传用户:青春给了作业95

  • DAC技术用语 (D/A Converters Defini

    Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains conSTant) for eachincrease in the input code. the converse is true for decreasing codes.

    标签: Converters Defini DAC

    上传时间: 2013-10-30

    上传用户:stvnash

  • 计算FR4上的差分阻抗(PDF)

    Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resinand glass fibre. Calculations, using Boundary Element field methods, show that the distribution of the electricfield within this layered structure determines the apparent dielectric conSTant and therefore affects theimpedance. Thus FR4 cannot be considered to be uniform dielectric when calculating differential impedance.

    标签: FR4 计算 差分阻抗

    上传时间: 2014-12-24

    上传用户:DE2542

  • 磁芯电感器的谐波失真分析

    磁芯电感器的谐波失真分析 摘  要:简述了改进铁氧体软磁材料比损耗系数和磁滞常数ηB,从而降低总谐波失真THD的历史过程,分析了诸多因数对谐波测量的影响,提出了磁心性能的调控方向。 关键词:比损耗系数, 磁滞常数ηB ,直流偏置特性DC-Bias,总谐波失真THD  Analysis on THD of the fer rite co res u se d i n i nductancShi Yan Nanjing Finemag Technology Co. Ltd., Nanjing 210033   Abstract:    Histrory of decreasing THD by improving the ratio loss coefficient and hysteresis conSTant of soft magnetic ferrite is briefly narrated. The effect of many factors which affect the harmonic wave testing is analysed. The way of improving the performance of ferrite cores is put forward.  Key words: ratio loss coefficient,hysteresis conSTant,DC-Bias,THD  近年来,变压器生产厂家和软磁铁氧体生产厂家,在电感器和变压器产品的总谐波失真指标控制上,进行了深入的探讨和广泛的合作,逐步弄清了一些似是而非的问题。从工艺技术上采取了不少有效措施,促进了质量问题的迅速解决。本文将就此热门话题作一些粗浅探讨。  一、 历史回顾 总谐波失真(Total harmonic distortion) ,简称THD,并不是什么新的概念,早在几十年前的载波通信技术中就已有严格要求<1>。1978年邮电部公布的标准YD/Z17-78“载波用铁氧体罐形磁心”中,规定了高μQ材料制作的无中心柱配对罐形磁心详细的测试电路和方法。如图一电路所示,利用LC组成的150KHz低通滤波器在高电平输入的情况下测量磁心产生的非线性失真。这种相对比较的实用方法,专用于无中心柱配对罐形磁心的谐波衰耗测试。 这种磁心主要用于载波电报、电话设备的遥测振荡器和线路放大器系统,其非线性失真有很严格的要求。  图中  ZD   —— QF867 型阻容式载频振荡器,输出阻抗 150Ω, Ld47 —— 47KHz 低通滤波器,阻抗 150Ω,阻带衰耗大于61dB,       Lg88 ——并联高低通滤波器,阻抗 150Ω,三次谐波衰耗大于61dB Ld88 ——并联高低通滤波器,阻抗 150Ω,三次谐波衰耗大于61dB FD   —— 30~50KHz 放大器, 阻抗 150Ω, 增益不小于 43 dB,三次谐波衰耗b3(0)≥91 dB, DP  —— Qp373 选频电平表,输入高阻抗, L ——被测无心罐形磁心及线圈, C  ——聚苯乙烯薄膜电容器CMO-100V-707APF±0.5%,二只。 测量时,所配用线圈应用丝包铜电磁线SQJ9×0.12(JB661-75)在直径为16.1mm的线架上绕制 120 匝, (线架为一格) , 其空心电感值为 318μH(误差1%) 被测磁心配对安装好后,先调节振荡器频率为 36.6~40KHz,  使输出电平值为+17.4 dB, 即选频表在 22′端子测得的主波电平 (P2)为+17.4 dB,然后在33′端子处测得输出的三次谐波电平(P3), 则三次谐波衰耗值为:b3(+2)= P2+S+ P3 式中:S 为放大器增益dB 从以往的资料引证, 就可以发现谐波失真的测量是一项很精细的工作,其中测量系统的高、低通滤波器,信号源和放大器本身的三次谐波衰耗控制很严,阻抗必须匹配,薄膜电容器的非线性也有相应要求。滤波器的电感全由不带任何磁介质的大空心线圈绕成,以保证本身的“洁净” ,不至于造成对磁心分选的误判。 为了满足多路通信整机的小型化和稳定性要求, 必须生产低损耗高稳定磁心。上世纪 70 年代初,1409 所和四机部、邮电部各厂,从工艺上改变了推板空气窑烧结,出窑后经真空罐冷却的落后方式,改用真空炉,并控制烧结、冷却气氛。技术上采用共沉淀法攻关试制出了μQ乘积 60 万和 100 万的低损耗高稳定材料,在此基础上,还实现了高μ7000~10000材料的突破,从而大大缩短了与国外企业的技术差异。当时正处于通信技术由FDM(频率划分调制)向PCM(脉冲编码调制) 转换时期, 日本人明石雅夫发表了μQ乘积125 万为 0.8×10 ,100KHz)的超优铁氧体材料<3>,其磁滞系数降为优铁

    标签: 磁芯 电感器 谐波失真

    上传时间: 2014-12-24

    上传用户:7891

  • ASC8512-CN两节锂电充电芯片

    两节锂电充电IC-ASC8512 ASC8512 为开关型两节锂聚合物电池充电管理芯片,非常适合于便携式设备的充电管理应用。ASC8512 集内置功率MOSFET、高精度电压和电流调节器、预充、充电状态指示和充电截止等功能于一体,采用TSSOP-14、SSOP-14两种封装形式。ASC8512对电池充电分为三个阶段:预充(Pre-charge)、恒流(CC/conSTant Current)、恒压(CV/conSTant Voltage)过程,恒流充电电流通过外部电阻决定,最大充电电流为2A.ASC8512 集成电流限制、短路保护,确保充电芯片安全工作。ASC8512 集成NTC 热敏电阻接口,可以采集、处理电池的温度信息,保证充电电池的安全工作温度。 两节锂电池充电IC ASC8512特点: 1.充2节锂离子和锂聚合物电池 2.开关频率达400K 3.充电电流最大可做2A 4.输入电压9V到18V 5.电池状态检测 6.恒压充电电压值可通过外接电阻微调 7.千分之五的充电电压控制精度 5.防反向保护电路可防止电池电流倒灌 6.NTC 热敏接口监测电池温度 7.LED充电状态指示 8.工作环境温度范围:-20℃~70℃ 9.TSSOP-14 应用领域:应用 ●手持设备,包括医疗手持设备 ●Portable-DVD,PDA,移动蜂窝电话及智能手机 ●上网本、平板电脑、MID ●自充电电池组

    标签: 8512 ASC CN 充电

    上传时间: 2013-11-06

    上传用户:chfanjiang