The inductor , which is one of the most important magnetic components , is not only used in lc filter and choke but also in rf communication circuit . the thin film inductor can be integrated with semiconductor components , so far it has not been widely used in these fields , the reason is the limited of thin - film material and substrate , process technology and design technology . designing and fabricating thin film inductor is the key point of this paper 而作为磁性元器件中最重要的电感，它不仅在lc滤波电路、扼流圈中必不可少，在现代射频通信电路中也被广泛使用，特别是能与硅器件一起集成的薄膜电感器，在国际上备受重视，而国内长期以来，由于受薄膜磁芯材料、绕组材料、基片材料，包括制作技术及最为关键的设计技术限制，尚未研发出能够用于这一应用领域的高、中、低频薄膜电感器。
The bias magnetic field of the bias coil driven by bias current and small signal test current , results in the induced signal of the control coil . the terminal voltage of the control coil is detected by the test circuit . then the signal containing the information of rotor displacement is obtained , from which we can get the dc voltage signal proportional to the rotor displacement through half - wave rectification circuit and low pass circuit . this dc signal is put into a pid controller to get the control signal of the rotor displacement 偏置测试电路向偏置线圈输入偏置电流和小信号测试电流,两者产生的偏置磁场在控制线圈产生感应信号,检测电路检测控制线圈端电压并提取含有转子位移信息的电压信号,该信号经半波整流电路和低通滤波电路后得到与转子位移成正比例的直流信号,再由pid控制器转换为转子位移的控制信号,最后控制信号输入功放电路产生控制电流,实现闭环控制。
It designed signal amplifying circuit , frequency tricking circuit , data sampling and keeping circuit . the choice of 12 bits high accuracy a / d integrated data sampling card made program simply , high flexible and expandable . and to each error which is likely to occur in high voltage capacity type equipment during the monitoring , analysis and judgement are given 在硬件电路实现上，注意选择信号传感器；合理设计了信号放大电路和滤波电路；设计了频率跟踪电路，数据采样/保持电路；结合软件控制选用了12位高精度的a / d转换器，使软件编程简化且具有较高的灵和性和可扩展性。
System is made up of two parts of hardware and software , hardware part include ecg signal receive , enlarge and filter circuit and gather circuit two parts among them , design isa and pci two bus collection card of form separately ; software part include and can programme and run side by side 8255 interface and cpld and interface software design of ad574a , using interrupt way to design the software of data collecting , and realization of data compress , and software design of administrative system 本系统由硬件和软件两部分组成，其中硬件部分包括心电信号的接收、放大和滤波电路以及采集电路两部分，分别设计了isa和pci两种总线形式的采集卡；软件部分包括可编程并行接口8255和cpld与ad574a的接口软件设计、中断方式数据采集系统的软件设计、数据压缩以及病例管理系统的软件设计。
The power circuit of the system adopts the voltage frequency conversion structure of ac - dc - ac , and is composed of the commutation circuit , filter circuit and intelligence power module ( pm15rsh120 ) . control circuit takes the dsp chip tms320lf2407 as core , including the pwm signal occurrence circuit , detect circuit of stator current and direct current voltage of generatrix , drive circuit of intelligence power module , detect circuit of speed , protect circuit of system etc . all of this builds the full digital vector control system of asynchronous motor 该系统的功率电路采用电压型的交-直-交变压变频结构,由整流电路、滤波电路及智能功率模块ipm ( pm15rsh120 )逆变电路构成;控制电路以dsp芯片tms320lf2407为核心,加上pwm信号发生电路、定子电流检测电路、直流母线电压检测电路、智能功率模块驱动电路、速度检测电路、系统保护电路等,构成了功能齐全的异步电机全数字化矢量控制系统。
The fourth chapter : in this chapter , it introduces the hardware designing of the dsp system based on pci bus and states every module of the hardware designing : circuit of signal adjusting , filter circuit of anti - overlap , circuit of data - acquisition automatically , expanding circuit of dsp memory , circuit of voltage matching , interfaces circuit of pci etc . it also includes theoretic basis and procedure of pcb designing 第四章介绍基于pci总线的dsp系统硬件设计。叙述了硬件设计的各个模块：信号调理电路、抗混叠滤波电路、自动数据采集电路、 dsp存储器扩展电路、电平匹配电路、 pci接口电路等，以及pcb设计的理论基础和设计过程，并给出了设计和调试的结果。
For the improvement of reliability and stability of the whole apparatus , meanwhile , for eliminating various electric - magnetic disturbance within the power supply and ground , measures such as filter , grounding , shielding are all taken in technique . the special methods are lc filter for power supply , bypass capacitor for suppressing voltage surge in printed circuit board , shielding layer wrapped in sensor head and overall grounded 通过采用合理的滤波、接地、屏蔽等各种方法，尤其是采用电源lc滤波电路、电源上加旁路电容抑制线路板上的电压波动、传感头加屏蔽层、传感头总体接地结构等多种抗干扰办法，减小了电源和地线上的各种电磁干扰，保证了系统的稳定性和可靠性。
In order to realize flux feedback control , the request of air gap flux density measurement is studied . using the 3d magnetic field analysis software , how and where to install the magnetic field sensors have been discussed . then two magnetic fields measuring methods have been chosen : the hall effects measurement and the electromagnetic induction method 为实现磁通反馈控制,分析了悬浮磁场对磁通密度测量的要求,利用三维磁场分析软件对磁场测量元件的安装方式与安装位置进行了分析,选择了两种磁场测量方法:霍尔效应法与电磁感应法,并分别设计了测量及信号放大、滤波电路,实现了悬浮磁场的测量。
Based on the testing principle of wheatstone bridge , a simple testing system is set up with two cascaded amplifiers and two cascaded butterworth lowpass filters . the varying voltage is tested by the system as the pressure is changed . experiment data are obtained , which also prove the feasibility of the design and the process flow 5 .基于惠斯顿电桥的测量原理,利用两级放大电路和两级巴特沃思低通滤波电路搭建了一简单的测试电路系统,成功地检测出了输出电压的微小变化值并得出了一些初步的实验数据,验证了芯片设计和工艺流程的正确可行性。
This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology . the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview , the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation , which satisfies the index of performance of dsss . 3 ) the low voltage plc system includes the sc1128 , the specific modulation / demodulation ic , the bpf filter and other circuit components , furthermore , the control function of system is realized by means of the personal computer and the microcontroller 本课题在对低压电力线的传输特性和数字调制技术进行分析的基础上，将通信理论中的直接序列扩频技术( dsss )用于解决低压电力线通信的干扰问题，主要研究内容如下： ( 1 )用通信仿真软件systemview对dsss技术的通信和抗干扰原理进行仿真分析，分别对时域和频域下采用dsss技术前后接收信号的频谱进行分析，验证dsss技术在本系统中的可行性； ( 2 )由dsss技术对滤波系统的要求，根据滤波理论分析了巴特沃思型滤波器的逼近原理并设计了合适的滤波电路； ( 3 )用调制解调芯片sc1128和自行设计的滤波器加之辅助外围电路，构造出低压电力线载波通信系统，并采用atmel公司的单片机设计了接收和发射电路的微控制器； ( 4 )分别对采取抗干扰措施前后输入和输出信号进行对比实验，并对结果进行分析，验证了dsss技术对干扰信号的抑制作用。
