本文關(guān)鍵詞：靜電防護(hù)中TVS對LNA阻抗網(wǎng)絡(luò)影響的研究及應(yīng)用　出處：《南京師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： TVS 靜電放電 LNA 阻抗網(wǎng)絡(luò) 阻抗匹配

【摘要】：隨著現(xiàn)代電子科技的迅猛發(fā)展,各種微電子和電路系統(tǒng)逐漸向高度集成化、微型化、低功耗方向發(fā)展.這在電路系統(tǒng)功能增強的同時,對電路和電子器件的電磁兼容(EMC)性也提出了越來越高的要求。而靜電放電(ESD)是一種常見的電磁危害源。無線通信系統(tǒng)中,到達(dá)接收機的射頻信號電平多為微伏數(shù)量級。因此,需要將微弱的信號進(jìn)行放大。LNA低噪聲放大器一般作為射頻系統(tǒng)的第一級,極易受到來自外部的ESD沖擊而損壞。瞬時浪涌電壓抑制管(TVS)是有效的ESD電流抑制器件,在ESD電路的設(shè)計中和產(chǎn)品ESD問題的解決中扮演重要角色。TVS通常并在電路中泄放ESD電流以保護(hù)后面電路的正常工作。但在射頻領(lǐng)域,TVS的寄生參數(shù)效應(yīng)將大大增加,將影響LNA的輸入阻抗,造成增益下降,無法正常工作。研究TVS對射頻LNA匹配網(wǎng)絡(luò)的影響具有較大的工程應(yīng)用價值。針對上述問題,本文開展了“TVS引起的LNA阻抗網(wǎng)絡(luò)失配的研究及應(yīng)用”,包括以下四個部分：(1)對TVS,靜電放電進(jìn)行了簡介。包括TVS特性,靜電放電的電流特征,TVS在靜電保護(hù)中的應(yīng)用價值。(2)介紹了分析LNA阻抗網(wǎng)絡(luò)的方法,S參數(shù)和阻抗圓。推導(dǎo)引出了LNA達(dá)到最大增益時的匹配條件,并對TVS引起的LNA阻抗失配進(jìn)行了分析。(3)通過典型的LNA阻抗網(wǎng)絡(luò)的設(shè)計,仿真,與實驗,驗證了TVS對LNA阻抗網(wǎng)絡(luò)造成的額外負(fù)載效應(yīng)。本文借助ADS (Advanced Design System)仿真軟件,設(shè)計了一種典型的LNA晶體管電路,并以此為實驗對象。本文擬通過對所需阻抗網(wǎng)絡(luò)的計算分析,評估TVS對阻抗網(wǎng)絡(luò)的負(fù)載作用,將仿真結(jié)果與實驗結(jié)果進(jìn)行對比。(4)設(shè)計兩種工程應(yīng)用方案,針對TVS引入的寄生參數(shù)進(jìn)行抑制,使LNA能夠有效地規(guī)避TVS的負(fù)面影響及ESD電流的沖擊。理論分析與實驗結(jié)果表明,TVS引入的負(fù)載與LNA阻抗網(wǎng)絡(luò)處于同一數(shù)量級,會對LNA的正常工作造成不穩(wěn)定的影響。在射頻電路ESD問題的設(shè)計和解決中,使用TVS需要考慮TVS本身的寄生參數(shù)。本文給出的改善措施,雖然不能完全的恢復(fù)LNA的增益水平,但也能工程師在ESD保護(hù)電路設(shè)計時提供思路。研究TVS對射頻匹配網(wǎng)絡(luò)的影響具有較大的工程應(yīng)用價值。
[Abstract]:With the rapid development of modern electronic technology, microelectronic circuit and system gradually to a high degree of integration, miniaturization, low power consumption direction. This increase in circuit system function at the same time, the electromagnetic compatible circuit and electronic device (EMC) is also put forward higher requirements. The electrostatic discharge (ESD) is a common electromagnetic hazard source in wireless communication system, reach the level of RF signals receiver for microvolt magnitude. Therefore, to weak signal amplification.LNA low noise amplifier in general as the first stage of the RF system vulnerable to external shocks and damage ESD. Instantaneous surge voltage suppression (TVS) is ESD current effective suppression devices play important role in.TVS and usually work in the circuit ESD discharge current to protect the back of the circuit in ESD to solve the problem of ESD circuit design and products. But In the RF field, effects of parasitic parameters of TVS will greatly increase, will affect the input impedance of the LNA, resulting in decreased gain, can not work normally. It has great application value to study effects of TVS on LNA RF matching network. Aiming at the above problems, this paper carried out the research and Application of LNA impedance mismatch caused by TVS network that includes the following four parts: (1) to TVS, electrostatic discharge are introduced. Including TVS characteristics, current characteristics of electrostatic discharge, the application value of TVS in electrostatic protection. (2) introduced the analysis method of LNA impedance network, S parameters and impedance circle. Derivation leads to the LNA matching condition reached the maximum gain of LNA and TVS caused by impedance mismatch is analyzed. Through the design of LNA (3), a typical impedance network simulation and experimental verification, the additional load effect of TVS on the LNA impedance network caused. With the aid of ADS (Advanced De Sign System) simulation software, a typical LNA transistor circuit design, and as the experimental object. This paper analyses the calculation of the required impedance network, load impedance assessment in the TVS network, the simulation results were compared with the experimental results. (4) design engineering application program of two, according to the parasitic parameter TVS is introduced to suppress the negative effects, so that LNA can effectively avoid the TVS and ESD current impact. Theoretical analysis and experimental results show that the introduction of TVS and LNA network load impedance at the same level, will work normally on LNA for destabilizing effects. In the design and RF circuit ESD the use of TVS, need to consider the parasitic parameters of TVS itself. This paper gives the improvement measures, although the gain level can not completely restore the LNA, but also can provide engineers way in ESD protection circuit design of TVS. The influence of radio frequency matching network has great engineering application value.

【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN03;TN722.3

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本文編號：1387600