查询词典 analog to digital converter

In this thesis, a field programmable analog array appliable for industrial control is presented and analyzed. The whole system is composed of configurable analog blocks and interconnection network. Through programming the two circuit groups above, FPAA can be reconfigured to implement many desired analog functions along system level.

本论文旨在提出并分析了一种适用於工业控制用途的可程式类比阵列设计概念，大致上整体电路乃是经由可配置类比方块与连线网路两要素所构成，所以FPAA能够透过规划以上两项基本单元来建构出所需的类比函数，使得本系统的最大优点即在於可将类比电路设计提升至系统层次。

Aim at the question of measurement inaccurateness for the causes of disturbances and temperature excursion in the PLC multi-analog signals measure system,a kind of analog calibration method least square algorithm based is put forward.And then the detailed computation process of PLC analog signal's measure calibration is provided.

在由传感器、隔离器和PLC模拟量测量模块以及后端显示计算机组成的多路测量系统中，如果对测量参数不进行标定，则由于仪器本身的测量误差、多路测量通路之间的干扰等因素，后端测量计算机显示的测试数据往往是不准确的。

As a nucleotide analog, synthesization of entecavir not only guides synthesizing other analog, but also is propitious to impolder new nucleotide analog.

做为核苷类似物，恩替卡韦的合成不但可以指导其它该类药物的合成工艺，还有利于开发核苷类似物的新型药物。

The instruments used ATmega16L onboard A / D converter channels to achieve the cold wind pressure, the hot blast pressure, the furnace top pressure and cold wind current capacity four way analog acquisition;used PWM waveform produced by ATmega16L internal timing / Counter to achieve the entire differential pressure ,the cold wind flow and the permeability index three-way analog output for recording instruments; realized the cold wind pressure, the hot blast pressure, the furnace top pressure, the cold wind current capacity and the entire differential pressure five group parameter tour demonstration and the fixed-point demonstration by key-elect key's coordination during demonstration blast furnace permeable index; produced acousto-optics alarm when the permeable index across the upper and lower limits;used RS-485 realizing the communication with the superior computer.

仪表利用ATmega16L自带的A/D转换通道实现对冷风压力、热风压力、炉顶压力及冷风流量四路模拟信号的采集；通过ATmega16L内部的定时/计数器产生的PWM波形来实现对全压差、冷风流量及透气性指数三路模拟量输出供记录仪表使用；通过键选键的配合在显示高炉透气性指数的同时实现冷风压力、热风压力、炉顶压力、冷风流量及全压差五路参数的巡回显示与定点显示；当高炉透气性指数越上、下限时，仪表产生声光报警信号；仪表采用RS-485与上位机实现通信。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

Based on the A / D converter the basic principles and characteristics of the broadband A / D converter technology and A / D converter, the choice of a number of exploration and study.

本文基于A/D转换的基本原理和特性，对宽带A/D转换技术和A/D转换器的选择进行一些探讨和研究。

The configuration scheme of lightning arrestor protection for converter station, the principle of insulation coordination and overvoltage protection strategy for converter station are analyzed; the parameters and characteristic of lightning arresters are calculated; after analyzing the overvoltage protection for equipments and insulation level of equipments in detail, the discharge voltage of air clearances in converter station is given preliminarily.

自2005年国家电网公司部署建设±800kV直流特高压输电工程以来，组织国内外直流专业公司、科研院所、设计单位开展了广泛的研究工作[1-5]。从主接线方案的比较、户内外直流开关场的选择到绝缘裕度的确定，都从绝缘配合设计的角度进行了研究和比较，取得了大量研究成果[6-11]。

Fluid strength torque converter although can stepless change the torque in certain scope compared to, but because it exists changes turns between ability and the efficiency contradiction, at present the application fluid strength torque converter generally changes turns the coefficient insufficiently to be all big, satisfies the automobilism request with difficulty, therefore on the high-quality passenger vehicle, widely uses is fluid strength torque converter and the gear type transmission gearbox union composition fluid strength mechanical type variator.

液力变扭器虽然能在一定范围内无级地改变扭矩比，但由于它存在着变扭能力与效率之间的矛盾，目前应用的液力变扭器一般变扭系数都不够大，难以满足汽车使用要求，故在高级轿车上，广泛采用的是液力变扭器与齿轮式变速器联合组成液力机械式无级变速器。

When compared with TL Buck converter, efficiency of this new converter is higher and the DC voltage blocking capacitor[1] can be smaller, when compared with double frequency Buck converter, voltage stress of the high frequency switches is lower, the output capacitor and inductor is smaller, and the dynamic load characteristic is better.

与三电平Buck变换器相比，复合双频Buck变换器具有较高的效率，而且其"隔直"电容可以取得更小。与双频Buck变换器相比，其具有高频开关电压应力低，输出滤波电感、滤波电容小，动态负载性能好等优点。

In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

Although translator has turned from being a crystal ball by which the original culture can unrestrainedly penetrate to another crystal ball by which the target culture can freely traverse, the translator's personal embodiment, in the process of cognitive act, are still absent in translation studies. Translators are still subjects without body or simply disembodied subjects.

译者虽然由原语文化可以自由穿透的玻璃球变成了译语文化可以自由穿越的玻璃球，但译者认知过程中的个体体验在翻译研究中依然缺席，译者依然仅仅是一个没有躯体体验的主体。

Chillingly, he claimed our technology is 'not nearly as sophisticated' as theirs and "had they been hostile", he warned 'we would be been gone by now'.

令人毛骨悚然的，他声称我们的技术是'并不那么复杂，像他们一样，和"如果他们敌意"，他警告说，'我们将现在已经过去了。