LVDS在DSP系统中的应用与研究

发布时间：2019-02-13 14:20

【摘要】：在信息时代,数据传输系统必须满足传输数据速度快,传送量大的特点。随着科技的进步,工艺尺寸越来越小,电源电压也越来越低。但是技术进步的同时,很多影响数据传输速度的不利因素出现了,例如偏斜和串扰等。普通的并行I/O接口电路受到自身电路结构和传输线的限制,已经不能满足不断发展的高速微处理器、多媒体以及网络技术的数据带宽要求。为了实现数据的可靠传输,采用串行传输方式。在串行传输中,低电压小摆幅的方式可实现数据的高速传输、低功耗和低成本。低电压差分信号传输技术可以实现高速度、低功耗数据传输。LVDS正是一种采用差分信号串行传输的接口电路,其具有低电压、小摆幅的优点,被广泛应用于许多数据传输电路中。本论文首先对高速信号传输理论进行深入的研究,在此基础上设计了一款应用于DSP操作系统的LVDS电路。论文在LVDS接口电路的设计中,主要工作归结如下: 1)设计了一款新型预加重电路,降低了驱动电路的输入电容,极大的减少了传输线上的信号衰减,保证了信号传输的可靠性。 2)重新设计了共模反馈电路,使LVDS驱动器能够在较高的频率下正常工作。本共模反馈电路采用无电阻的方式,占用的面积更小,性能更好。 3)对于接收器的设计,采用预放大器、迟滞比较器、整形缓冲模块结合的电路结构,其具有较宽的共模电压接收范围。 4)设计了一款新型预放大器,并且将输出缓冲电路和电平转换电路合为一体,这种结构缩小了版图面积,性能更好。 5)设计了实效保护电路,保证电路运行的可靠性。采用0.18μm CMOS工艺进行电路实现,数据传输速率达到1Gbps。模拟结结果表明,该LVDS接口电路满足DSP系统应用要求。
[Abstract]:In the information age, the data transmission system must meet the characteristics of fast data transmission and large amount of transmission. With the development of science and technology, the process size is smaller and the power supply voltage is lower and lower. But along with the technological progress, many unfavorable factors, such as skew and crosstalk, appear to affect the speed of data transmission. The common parallel I / O interface circuit is limited by its own circuit structure and transmission line, and can not meet the requirements of the data bandwidth of the developing high speed microprocessor, multimedia and network technology. In order to realize the reliable transmission of data, serial transmission is adopted. In serial transmission, low voltage and small swing can achieve high speed data transmission, low power consumption and low cost. Low voltage differential signal transmission technology can realize high speed and low power data transmission. LVDS is a kind of interface circuit which uses differential signal serial transmission, which has the advantages of low voltage and small swing. It is widely used in many data transmission circuits. In this paper, the theory of high speed signal transmission is studied deeply, and a LVDS circuit is designed for DSP operating system. In the design of LVDS interface circuit, the main work is summarized as follows: 1) A new preweighting circuit is designed, which reduces the input capacitance of the drive circuit and greatly reduces the signal attenuation on the transmission line. The reliability of signal transmission is guaranteed. 2) the common-mode feedback circuit is redesigned to make the LVDS driver work normally at higher frequency. The common-mode feedback circuit uses resistive-free mode, occupies a smaller area and better performance. 3) for the design of receiver, the circuit structure of preamplifier, hysteresis comparator and shaping buffer module is adopted, which has a wide common mode voltage receiving range. 4) A new preamplifier is designed, and the output buffer circuit and the level conversion circuit are combined into one. The structure reduces the layout area and the performance is better. 5) the practical protection circuit is designed to ensure the reliability of the circuit. Using 0.18 渭 m CMOS process to realize the circuit, the data transmission rate is 1 Gbps. The simulation results show that the LVDS interface circuit can meet the requirements of DSP system.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.1

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