發(fā)布時(shí)間：2018-12-13 02:58

【摘要】：隨著國(guó)家航天事業(yè)的飛速發(fā)展,宇航應(yīng)用也不斷對(duì)集成電路設(shè)計(jì)提出新的挑戰(zhàn),RS-422協(xié)議接口電路以其工作穩(wěn)定、可靠性高等特點(diǎn),在國(guó)防及航天領(lǐng)域中同樣應(yīng)用廣泛。低頻長(zhǎng)線傳輸中廣泛應(yīng)用的接口電路采用RS-422協(xié)議規(guī)范,該類接口電路一般由發(fā)送器和接收器兩部分組成,發(fā)送器是由簡(jiǎn)單的數(shù)字邏輯和較大的輸出驅(qū)動(dòng)管組成,傳輸末端的接收器是由差分放大器完成對(duì)長(zhǎng)線上衰減后信號(hào)的識(shí)別。傳統(tǒng)的接收器往往采用簡(jiǎn)單的二級(jí)放大器來(lái)實(shí)現(xiàn),這種結(jié)構(gòu)電路增益小、反映速度慢,且伴隨著較大的功耗。近些年,高速低功耗設(shè)計(jì)已經(jīng)變成集成電路設(shè)計(jì)領(lǐng)域關(guān)注的焦點(diǎn),整機(jī)系統(tǒng)市場(chǎng)也紛紛提出了對(duì)高速度和低功耗的要求,這使得傳統(tǒng)的接收器迫切需要改進(jìn)優(yōu)化、重新考慮提高響應(yīng)速度和降低功耗的設(shè)計(jì)�？鐚�(dǎo)運(yùn)算放大器(OTA)以電流驅(qū)動(dòng)、增益可調(diào)等優(yōu)勢(shì),一直被人們所廣泛使用。本文利用OTA(Operational Transconductance Amplifier)替代傳統(tǒng)接收器中放大器,通過(guò)對(duì)傳統(tǒng)OTA電路的分析,不斷優(yōu)化設(shè)計(jì),最終實(shí)現(xiàn)接收器電路的高速低功耗。本文所設(shè)計(jì)的OTA,電路增益達(dá)到60dB,單位增益帶寬(GBW) 2.213MHz,相位裕度60.11°,靜態(tài)電流30gA,正向壓擺率44V/μs,負(fù)向壓擺率74.9V/μs。最后設(shè)計(jì)出的RS-422協(xié)議接口模塊電路的靜態(tài)電流只有3.4mA,傳輸延遲Tplh為20.02ns、Tphl為18.5ns。為了滿足更多的應(yīng)用需求,本文對(duì)所設(shè)計(jì)的接口模塊電路進(jìn)行了ESD(Electro Static Discharge)可靠性設(shè)計(jì)和抗輻射加固設(shè)計(jì),并對(duì)ESD結(jié)構(gòu)進(jìn)行了流片測(cè)試,全芯片抗ESD能力達(dá)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 擄, 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.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN402

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