和电路

In the part of the diesel engine control, the position closed loop control system was adopted includes: microprocessor, isolation circuit, power magnify circuit, accelerograph actuator of the engine and the signal modulate circuit.

对于发动机控制部分，详细讲述了采用位置闭环控制的发动机电控单元的几个主要组成部分：微控制器、隔离电路、功率放大电路、油门执行器和信号调理电路等。

The basic LC circuit and the resonant dc link with active clamping circuit are analyzed in details and conclusion can be drawn that the later is the simplest and the most reasonable circuit.

对基本的LC电路和带主动箝位的谐振环节电路进行了详尽的分析，研究表明：后者是最为简单合理的电路形式。

It is therefore sensible to separate analog and digital circuitry to prevent digital noise from corrupting analog performance.

为了不影响模拟电路的性能，应该把模拟电路的电源和数字电路的电源隔离开。

The circuit possesses many properties of current-mode circuit. Its sensitivity is lower, and its pole angular frequency and quality factor can be tuned accurately and independently, and the circuit is very easy in this process.

该电路不仅具有电流模电路的特点，而且其无源灵敏度低，电路简单；品质因素、极点角频率取决于电容比值和电阻比值，从而可实现二者的独立、精确调节。

Based on the propagation algorithm of signal probability,the decomposition algorithm of a multi-input XOR/AND gate,and the multiple segment algorithm of polarity conversion,this paper successfully applies the whole annealing genetic algorithm to find the best polarity of an RM circuit.

徐建 宁波大学电路与系统研究所，宁波 315211针对n变量逻辑函数在不同极性下所对应REED-MULLER 电路功耗和面积不同的特点，对信号几率传递算法、多输入XOR/AND门的低功耗分解算法和多成份极性转换算法进行了深入研究，成功地将整体退火遗传算法(whole annealing genetic algorithm，WAGA)应用于RM电路最佳极性的搜索。

At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.

首先对加速度计及其测试技术的发展历史和现状，液浮摆式加速度计的工作原理和数学模型等作了简要的介绍，然后确定了以二元调宽脉冲再平衡测试回路为设计方案，并从控制理论的角度进行了分析，着重研究了系统中各部分的传递函数，利用系统开环传递函数分析了系统的稳定性，同时设计了系统的校正网络；分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题，并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路，验证了电路的正确性，最后按照测试系统的要求，采用了美国NI公司专为测试领域所开发的虚拟仪器工具——LabVIEW作为测试软件开发工具，利用该图形化编程语言完成了测试系统软件部分的设计，实现了测试功能。

In order to solve the problems of bad shunting and red light strip phenomenon at electric railway section caused by the defective of asymmetric pulse track circuit receiver formerly, a new type of asymmetric impulse track circuit receiver is designed. It takes the PIC16F887 single-chip microcomputer as central processing unit of the system, realizes processing and judging the asymmetric impulse from the track transformer automatically. The article focused on the receiver work flow, hardware circuit and software design.

摘 要：为了解决以往多数不对称脉冲轨道电路接收器存在缺陷而导致的分路不良问题和电气化区段空闲&红光带&现象，设计了一种新型脉冲轨道电路接收器，系统以PIC16F887单片机为核心处理单元，自动实现对由轨道变压器传来的不对称脉冲信号进行处理和判决，重点讨论了接收器工作流程、硬件电路实现以及软件设计。

This paper presented the main functions and characteristics of Multisim8.0, and the main qualities of high frequency tunable amplifier such as voltage gain, transmission bands and selectivity were studied using simulation analysis and testing technologies of Multisim 8.0. The results are visual and precise, and prove the theory very well. This software has powerful simulation and analysis function, by which the analysis and design of high frequency circuit are not only more precise and credible, but also more closed to the real circuit running status.

本文介绍了Multisim8.0仿真软件的主要功能及特点，并结合该软件对高频单调谐放大电路的电压增益、通频带、选择性等主要质量指标进行了测试与仿真分析，结果直观、精确，很好地验证了理论，表明该软件有强大的仿真和分析功能，在实现高频电路分析和设计方面不仅高效、可靠，而且具有逼近真实电路的效果。

Every sub-circuit is designed reasonably according to the principle and character of PWM switching converter, such as: bandgap, error amplifier, oscillator, narrow pulse generator, saw tooth generator, PWM comparator, PWM modulator, output stage, OCP circuit and low voltage comparator.

根据PWM开关电源的原理和特点，合理地设计了各个子电路，其中包括：带隙基准源、误差放大器、振荡器、窄波发生器、锯齿波发生器、PWM比较器、PWM脉冲调整器、输出级电路、过流保护电路和低压比较器等。

Theoretical analysis proves that the new power supply has high performance such as high accuracy, high efficiency, low input ripple current, excellent EMC characteristic, light weight and low cost compared with the traditional laser power supply.

在理论和仿真分析的基础上，完成了新型高性能脉冲激光电源的硬件电路系统，详细的分析了主要电路参数的确定和电源的系统具体的电路设计。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。