Using the cogent validity of backstepping " s solving parametric - strict - feedback nonlinear systems , xinghuo yu and wu yuqiang ( 1998 ) solved the output - tracking problem of a kind of linear time varying system by combining nonlinear damping method and variable structure scheme . in this dissertation , we sufficiently consider the effect of disturbances in the input channel basing on the same model Xinghuoyu和yuqiangwu ( 1998 )针对一类线性时变系统的输出跟踪问题,基于back飞tepping设计机制,将带有非线性dallpipg项的设计方法与变结构控制方法相结合,给出了一种新的非线性控制器设计方法
Thirdly , the range switch circuit and filter circuit are designed in the analog input channel . to realize the safe high speed acquisition , the interface circuits are separated from the function circuits , and the isolation power with high performance and digital isolator is used to restrain the common mode disturb and noise of the input 3 .模拟输入通道设计有量程切换电路和滤波电路,并且采用了屏蔽、浮置技术和磁耦隔离技术,使用了高性能的隔离电源和磁电耦合器,有效地抑制了输入信号的共模干扰和噪声,实现了安全、高速的数据采集。
The main design work as follow : four biomedical analog signals input channels " design ; the design of at89c51 microprocessor system which can change the sampling rate ; the dma interfacing circuit design by which the sampling data enter the computer ; the interfacing circuit design between pc and signal amplifier , and the reliability and anti - interference design of this system , etc 具体设计内容包括:四路生物医学模拟信号输入通道设计;以at89c51为核心的可实现采样速率程控调整的微处理器系统设计;采样数据进入pc机的dma接口电路设计; pc机与生物信号放大器之间联系的接口电路设计;以及系统的可靠性和抗干扰设计等。
Based on this simulation method , the following novel designs are developed : 1 , the two - stigma design , which can reduce the aberrations and improve the imaging of the grating ; 2 , the flat - field design , which can omit the output waveguides and make an edg easier tc fabricate ; 3 , the passband flattening design , which can relax the requirements on wavelength control for lasers and filters in a wdm system ; 4 , the reduced back - reflection design , which guarantees very little reflection light back into the input channel and improves the feature of the return loss 本论文以用于光通信中的平面集成蚀刻衍射光栅为研究对象,具体的分析了的它的工作原理和设计思想,并给出了设计中的经验和方法。器件设计后需要进行性能计算和模拟以减小复杂的集成光器件制作试验,本论文描述了计算蚀刻衍射光栅比较准确的模拟方法,其结果能够很好的接近实际情况。基于这样的模拟计算方法,本论文提出了改进蚀刻衍射光栅设计的几种方法: 1
The hardware has two input channels of high - speed analog signal , with the signal amplitude of 0 - 5v , the conversion precision of 12bits , and the maximum sampling rate of 400ksps . this system includes 4 dsps ( adsp 2181 ) , which can be arranged as a pipe line processing array . many algorithms can be realized in this system 系统硬件有两路模拟数据采集通道,模拟信号输入范围为0 ? 5v ,转换精度为12位,最高采样率400ksps ;系统包含4片dsp ( adsp2181 )构成的流水线型的处理阵列,可用于实现各种算法;系统的控制逻辑由fpga完成。