基于低功耗高速瞬态响应OTA的高可靠抗辐射接口电路设计

发布时间：2018-12-13 02:58

【摘要】：随着国家航天事业的飞速发展,宇航应用也不断对集成电路设计提出新的挑战,RS-422协议接口电路以其工作稳定、可靠性高等特点,在国防及航天领域中同样应用广泛。低频长线传输中广泛应用的接口电路采用RS-422协议规范,该类接口电路一般由发送器和接收器两部分组成,发送器是由简单的数字逻辑和较大的输出驱动管组成,传输末端的接收器是由差分放大器完成对长线上衰减后信号的识别。传统的接收器往往采用简单的二级放大器来实现,这种结构电路增益小、反映速度慢,且伴随着较大的功耗。近些年,高速低功耗设计已经变成集成电路设计领域关注的焦点,整机系统市场也纷纷提出了对高速度和低功耗的要求,这使得传统的接收器迫切需要改进优化、重新考虑提高响应速度和降低功耗的设计。跨导运算放大器(OTA)以电流驱动、增益可调等优势,一直被人们所广泛使用。本文利用OTA(Operational Transconductance Amplifier)替代传统接收器中放大器,通过对传统OTA电路的分析,不断优化设计,最终实现接收器电路的高速低功耗。本文所设计的OTA,电路增益达到60dB,单位增益带宽(GBW) 2.213MHz,相位裕度60.11°,静态电流30gA,正向压摆率44V/μs,负向压摆率74.9V/μs。最后设计出的RS-422协议接口模块电路的静态电流只有3.4mA,传输延迟Tplh为20.02ns、Tphl为18.5ns。为了满足更多的应用需求,本文对所设计的接口模块电路进行了ESD(Electro Static Discharge)可靠性设计和抗辐射加固设计,并对ESD结构进行了流片测试,全芯片抗ESD能力达到HBM-4000V以上。
[Abstract]:With the rapid development of national aerospace industry, aerospace applications have also put forward new challenges to the design of integrated circuits. RS-422 protocol interface circuits are also widely used in the field of national defense and aerospace because of their stable work and high reliability. The interface circuit widely used in low frequency long line transmission adopts RS-422 protocol specification. This kind of interface circuit is generally composed of transmitter and receiver. The transmitter is composed of simple digital logic and large output drive tube. The receiver at the transmission end is a differential amplifier to identify the attenuation signal on the long line. The traditional receiver is usually implemented by a simple secondary amplifier, which has the advantages of low gain, low speed and high power consumption. In recent years, high speed and low power design have become the focus of attention in the field of integrated circuit design. The whole machine system market has put forward the requirements of high speed and low power consumption, which makes the traditional receiver urgently need to improve and optimize. Reconsider the design to increase response speed and reduce power consumption. Transconductance operational amplifier (OTA) has been widely used because of its current drive and adjustable gain. In this paper, OTA (Operational Transconductance Amplifier) is used to replace the amplifier in the traditional receiver. Through the analysis of the traditional OTA circuit, the design of the receiver circuit is optimized continuously, and the receiver circuit with high speed and low power consumption is finally realized. The designed OTA, circuit has a gain of 60dB, a unit gain bandwidth of (GBW) 2.213MHz, a phase margin of 60.11 掳, a static current of 30gA, a forward voltage pendulum ratio of 44V/ 渭 s and a negative voltage pendulum ratio of 74.9V/ 渭 s. At last, the static current of the RS-422 protocol interface module is only 3.4 Ma, and the transmission delay Tplh is 20.02 nsTphl is 18.5ns. In order to meet the needs of more applications, the ESD (Electro Static Discharge) reliability design and radiation hardening design of the designed interface circuit are carried out in this paper, and the ESD structure is tested by flow sheet. The whole chip anti-ESD capability is over HBM-4000V.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN402

【相似文献】