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发生电路
    A Real-time Pulse Generating Circuit
    一种实时脉冲信号发生电路
    Signal generating circuit is made up of single chip MSP430F149 and other related circuits, such as D/A converting circuit.
    其中,信号发生电路是以MSP430F149单片机为核心部件,通过D/A转换器等相关电路来实现所需的激励信号。
    In this paper, the main theory of DDS and the working principles of AD9850 are described at first, and then the generating circuit of a pulsed ultrasonic scanning waveform based on two AD9850s is introduced.
    阐述了DDS的一般原理和AD9850的工作原理,介绍了一种基于双AD9850构成的脉冲超声扫描波形发生电路设计。
    A Pulse Generating Circuit in Positive and Negative Sequence
    顺序逆序脉冲发生电路
    A New Broadband Narrow Pulse Ultrasonic Generating Circuit
    一种新颖的宽带窄脉冲超声波发生电路
    The signal collecting system of singlechip collects the signals from generator. The paper introduces the every part of the singlechip. The key component is a 8051CPU, its surrounding circuits include DC power source, simulating signal collecting circuit, digital signal collecting circuit, A/D converting circuit, clock generating circuit, counting frequency circuit, controlling circuit, communicating circuit, and some other circuits.
    前台单片机采集系统完成对发电机组多信息量的采集,本文详细介绍了电路设计,系统的核心器件为8051CPU,其外围电路包括电源电路、模拟信号采集电路、A/D转换电路、数字信号采集电路、时钟发生电路、测频电路、控制电路、通讯电路等。
    Subsequently, the disc type rotational armature generator and the rotational coupling transformer are separately leaded in to realize the power supplies of the carrier signal generating circuit and output of the measuring signal.
    接下来提出了采用盘式旋转电枢发电机解决载波信号发生电路电源供给问题的方案,同时通过旋转耦合变压器的引入,使得测量信号输出问题很好地解决;
    Two different three-layer wavelet neural networks are constructed for DBD ozone generating circuit fault, and the mathematical model and learning arithmetic are given.
    针对DBD型臭氧发生电路故障,构造了激活函数型和权值型两种不同的三层小波神经网络,给出了相应的数学模型和学习算法,建立了小波神经网络的输出与故障元之间的对应关系,实现了电路的故障诊断,并与用普通BP网络诊断的结果进行了比较。 仿真结果验证了两种故障诊断方法的正确性和较好的准确性。
    Secondly, basing on analysis of Direct Digital Frequency Synthesis (DDS)’s principle, structure and its optimization, this paper designs a low power consumption, high stability DDS generating circuit to generate a sine wave as the driving source for inductive displacement transducer.
    其次,在分析直接数字频率合成技术(DDS)的原理、结构及优化方法的基础上,本文设计了基于FPGA的低功耗、高稳定性的正弦信号发生电路,为电感位移传感器提供激励信号;
    The hardware system is mainly composed of sine wave source generating circuit, data acquisition and conversion circuit, TMS320F240 and its peripheral circuit, external memory circuit, 4x4 matrix keyboard circuit, LCD and serial communication circuit.
    硬件部分主要包括正弦波信号源发生电路、数据采集与转换电路、TMS320F240芯片及其外围存储器扩展电路、键盘接口电路与液晶显示电路以及串行通信接口电路。
    Upon the radio frequency admittance capacitive level measurement, the analog, digital circuits and relevant program of the system have been designed, especially the design of sine waveform generating circuit, synchronization channels circuit and filter circuit in the analog system.
    基于射频导纳电容式物位仪的工作原理,本文对射频导纳电容式物位仪的模拟电路、数字电路及相关程序进行了设计,尤其对模拟电路中的正弦信号发生电路、同步通道电路、滤波电路进行了重点论述与设计。
    For using the vector voltage/current method to measure impedance, we design the signal generating electro circuits and voltage/current sampling circuits. The signal generating circuit can produce sin wave signal within 0~2kHz for the impedance measuring in the different exciting signal source simulation using voltage/current method and for the frequency sweep signal mode.
    为实现电压电流法测量阻抗值,专门设计了信号发生电路和电压电流采样电路,其中信号发生电路能够产生频率为0~2kHz的近似正弦波信号,便于实现在不同频率值的激励信号下的电压电流法测量阻抗,也能够满足一定范围内的扫频模式测量。
    The mathematical relation formula is derived from the train running speed,distance and the output voltage frequency of tacho generator. The circuit diagram is given that realizes the relations by utilizing the principle of CMOS digital integrated circuit and frequency composition. Analysis and illustration are made regarding interface circuit,wheel diameter input method,frequency composition circuit,frequency dividing circuit,BCD proportion multiplier circuit,display circuit,base frequency generating circuit and power supply circuit.
    推导了列车运行速度、走行距离与测速发电机输出电压频率的数学关系式,给出了利用CMOS数字集成电路和频率合成原理实现上述关系的电路框图,并对其速度接口电路、轮径输入方法及频率合成电路、分频电路和BCD比例乘法器电路、显示电路、基准频率发生电路、电源电路等作了分析与说明。
    Basing on the theory of digital synchronizer, we analyze the character of GMSK signals in this paper, and design a practical and easily realized arithmetic of bit synchronization and integral detection. Basing on the theory of successive approximation A/D converter, with the external sawtooth wave generating circuit and the comparator in the SingleChip, We accomplished A/D convert by program.
    本文从 GMSK调制解调原理出发 ,分析了 GMSK信号的特征 ,依据数字同步器原理 ,提出了实用的比特跟踪同步和积分判决算法 ,并依照逐次逼近 A/ D转换器的原理 ,通过外部锯齿波发生电路 ,配合单片机内部的比较器和相关程序完成了输入信号的 A/ D转换 ,用单片机实现了 GMSK软件解调。
    The input isde is a PFC circuit with 400V DC voltage, with a full-bridge MOSFET inverter circuit, at the fixed-frequency PWM generating circuit and IR2110 driving circuit, the input DC voltage is changed to high frequency AC voltage, by only one resonant inductor, the MOSFET can achieve the zero voltage turn-on, this greatly decreases the switching lose and the switching noise.
    本电源由PFC电路提供 40 0V的高压直流输入 ,再由MOSFET组成全桥逆变电路 ,在固定频率的PWM发生电路和IR2 110MOSFET驱动电路作用下 ,只加一个谐振电感就可实现开关管的零电压开通 ,可在大大降低开关损耗和噪声的同时实现直流交流的变换。
    Based on the new method, a battery internal resistance intelligent measuring instrument was designed. Its main controller is ADuC 812 MCU and some advanced chips are adopted in its signal generating circuit and signal sample converting circuit. The frequency and amplitude of its AC signal could be properly adjusted according to battery's type and working environment.
    在新方法的基础上设计了蓄电池内阻智能测试仪,该仪器以ADuC 812单片机作为主控芯片,采用了新型信号发生电路和信号采样转换电路,可根据被测蓄电池型号和工作环境的不同适时改变交流信号的频率和幅值,并能与上位机进行通信。
    In order to reduce the cost and power of the system,this paper samples the high frequency sygnal(6.25MHz~100MHz)equivalently based on the precision clock generating circuit,and designs high speed circuit,AD,FIFO and FPGA etc. and implements a portable memoryoscillograph.
    为了降低系统成本和功耗,采用基于ARM系统的精密时钟发生电路对高频信号(6.25MHz~100MHz)进行等效采样,配合高速AD、FIFO和FPGA电路设计并实现一个手持式存储示波表。
    Triggered vacuum switches(TVS) are used as closing switches in the study. A three-electrode-gap is used in the high voltage trigger pulse generating circuit to acquire a steepened high voltage trigger pulse,so as to ensure that the accuracy of delay time of TVS switching to outer control signal is controlled within 1μs.
    所研究的触发电路中,高压触发脉冲发生电路采用三电极间隙产生陡化的高压触发脉冲,使触发真空开关导通延时的精度被控制在1μs以内。
    HFBR-0400 series of fiber optic transmitters and receivers are used in the trigger signal generating circuit to improve the ability to inhibit interference. Mis-triggering because of mutual interferences among stages is solved in the experiments of multi-stage launch.
    触发信号发生电路采用HFBR-0400系列光发射器和光接收器作执行元件,抗干扰能力强,在多级电磁发射实验中,消除了级间互扰造成的误触发。
 

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