This system is mainly constructed from a tms320lf2407a dsp which is used as the core of control parts and a dual full - bridge driver l298 which is used as driving parts . combined with other circuits and apparatus , the system fulfills the digital motor control 本系统采用tms320lf2407adsp微控制器作为核心控制器件，采用专门为两相四相步进电机设计的l298双全桥驱动芯片作为功率驱动器件，结合电流、转速反馈电路等实现对两相混合式步进电机的数字控制。
After analyzing the material , a new control pattern on the basis of fuzzy theory is proposed . a concrete controller has been constructed , including pwm producer , angle feedback and serial communicating circuits , etc . meanwhile , corresponding control programs have been designed . finally , some experiments have been carried 通过对sma材料机理的分析，提出了一种基于模糊理论的sma驱动器模糊控制方式，设计了驱动器的控制系统硬件部分，包括pwm控制器，转角反馈电路以及pc机与单片机串行通信电路等，编制了相关程序，并进行了实验。
In the meanwhile , according to the quite different demands which the overall performance of the ota imposes on its input and output cells , utilizing characteristics of switched - capacitor and common - mode feedback circuit , continuous common - mode feedback method and switched - capacitor method have been applied to the input and output cells , respectively 同时,根据ota整体指标对输入级和输出级单元不同的性能要求,并结合连续型共模反馈电路与开关电容型共模反馈电路的各自特点,将连续型共模反馈和开关电容共模反馈技术分别应用于运放输入级和输出级单元。
Much study are made on the noise of ccd sensor , both the correlated - quadrupole - sampling and correlated - double - sampling techniques are used in this system . also , pilter cooler technique are used to keep the temperature of ccd chip about - 20 , reducing the thermal noise . usb2 . 0 interface technique is also used to communicate between the camera and host computer 其中着重对ccd传感器的去噪声技术进行了研究,采用了相关双采样和相关四采样的方法处理视频信号,并分别进行12bits和14bits的a / d转换;在系统中使用了半导体致冷片和反馈电路构建了致冷电路,使ccd的温度保持在- 20以减少热噪声;数据传输采用usb2 . 0接口规范以满足实时数据传输的要求。
