射頻接收通道中AGC環(huán)路算法設(shè)計與研究
發(fā)布時間：2018-11-10 22:54
【摘要】：ZigBee技術(shù)作為無線傳感網(wǎng)絡(luò)中主要技術(shù)之一,具有低功耗、低成本和網(wǎng)絡(luò)容量大等優(yōu)點,廣泛地應(yīng)用于工業(yè)控制、智能家居和環(huán)境監(jiān)測等領(lǐng)域。自動增益控制系統(tǒng)作為ZigBee射頻接收機的重要組成部分,可以對不同強弱的信號,做出增益的自動調(diào)整,為后級電路提供一個穩(wěn)定的電平。因此,高性能的自動增益控制系統(tǒng)有助于更好的提升ZigBee網(wǎng)絡(luò)的通信質(zhì)量。文中涉及到的射頻接收機采用低中頻結(jié)構(gòu),符合ZigBee技術(shù)低功耗和低成本的要求。接收機中的自動增益控制環(huán)路采取數(shù)字信號控制的方式,代替?zhèn)鹘y(tǒng)的模擬控制方式,數(shù)字自動增益控制可以直接產(chǎn)生指數(shù)形式的增益變化,省去了指數(shù)產(chǎn)生電路,降低了設(shè)計復(fù)雜度,并具有很高的線性度;將射頻前端的低噪聲放大器變?yōu)樵鲆婵煽胤糯笃?控制信號同樣由數(shù)字自動增益控制算法模塊產(chǎn)生,減少了自動增益環(huán)路中對增益動態(tài)范圍的需求,同樣降低了設(shè)計復(fù)雜度;自動增益控制環(huán)路中的PGA(Programmable Gain Amplifier)模塊采取粗調(diào)部分和細調(diào)部分相結(jié)合的方式,不僅具有較高的精度,并且具有較大的動態(tài)范圍,只需要細調(diào)部分的放大器增益可變,粗調(diào)部分采用固定增益的放大器即可,通過數(shù)字信號控制其打開與關(guān)閉,進一步降低了設(shè)計復(fù)雜度。該算法所控制的射頻接收鏈路增益調(diào)節(jié)范圍共102dB,變化精度為2dB,其中低噪聲放大器模塊的動態(tài)范圍為32dB,分為-2dB、14dB和30dB三個狀態(tài),環(huán)路中可編程放大器的動態(tài)范圍為70dB,分為粗調(diào)部分和細調(diào)部分,粗調(diào)部分是4個增益為14dB的固定增益放大器,細調(diào)部分是動態(tài)范圍為14dB,變化精度為2dB的可變電阻放大器。依據(jù)5個峰值檢測器的結(jié)果對這兩個部分進行控制,對應(yīng)的是低噪放控制模塊和可編程放大器控制模塊,并加入增益分配調(diào)整模塊來優(yōu)化電路中的噪聲系數(shù)。在ModelSim SE軟件中完成了對該算法的功能仿真驗證,并通過Design Compiler綜合、Soc Encounter布局布線等EDA工具完成了其版圖設(shè)計。
[Abstract]:As one of the main technologies in wireless sensor networks, ZigBee technology has the advantages of low power consumption, low cost and large network capacity. It is widely used in industrial control, smart home and environmental monitoring and other fields. As an important part of ZigBee radio frequency receiver, the automatic gain control system can automatically adjust the gain of different strong and weak signals, and provide a stable level for the latter stage circuit. Therefore, high performance AGC system is helpful to improve the communication quality of ZigBee network. The RF receiver in this paper adopts low intermediate frequency structure, which meets the requirements of low power consumption and low cost of ZigBee technology. The automatic gain control loop in the receiver adopts the digital signal control instead of the traditional analog control method. The digital automatic gain control can directly produce the exponential gain change and eliminate the exponential generation circuit. The design complexity is reduced and the linearity is very high. The low noise amplifier of the RF front end is transformed into a gain controllable amplifier, and the control signal is also generated by the digital automatic gain control algorithm module, which reduces the demand for the dynamic range of the gain in the automatic gain loop and also reduces the design complexity. The PGA (Programmable Gain Amplifier) module in the AGC loop adopts the combination of coarse tuning part and fine tuning part, which not only has high precision, but also has a large dynamic range, and only needs the amplifier gain of fine tuning part to be variable. In the coarse tuning part, the fixed gain amplifier can be used to control the opening and closing of the amplifier by digital signal, which further reduces the design complexity. The range of gain adjustment of RF receiving link controlled by this algorithm is 102 dB, and the variation precision is 2 dB. The dynamic range of low noise amplifier module is 32 dB, which is divided into-2 dB and 30dB states, and the dynamic range of programmable amplifier in loop is 70 dB. There are four fixed gain amplifiers with 14dB gain and four variable resistor amplifiers with dynamic range of 14dB with varying precision of 2dB. According to the results of the five peak detectors, the two parts are controlled, corresponding to the low noise amplifier control module and the programmable amplifier control module, and the gain allocation adjustment module is added to optimize the noise coefficient in the circuit. The functional simulation of the algorithm is completed in the ModelSim SE software, and the layout is designed by EDA tools such as Design Compiler integrated, Soc Encounter layout and routing.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN92
[Abstract]:As one of the main technologies in wireless sensor networks, ZigBee technology has the advantages of low power consumption, low cost and large network capacity. It is widely used in industrial control, smart home and environmental monitoring and other fields. As an important part of ZigBee radio frequency receiver, the automatic gain control system can automatically adjust the gain of different strong and weak signals, and provide a stable level for the latter stage circuit. Therefore, high performance AGC system is helpful to improve the communication quality of ZigBee network. The RF receiver in this paper adopts low intermediate frequency structure, which meets the requirements of low power consumption and low cost of ZigBee technology. The automatic gain control loop in the receiver adopts the digital signal control instead of the traditional analog control method. The digital automatic gain control can directly produce the exponential gain change and eliminate the exponential generation circuit. The design complexity is reduced and the linearity is very high. The low noise amplifier of the RF front end is transformed into a gain controllable amplifier, and the control signal is also generated by the digital automatic gain control algorithm module, which reduces the demand for the dynamic range of the gain in the automatic gain loop and also reduces the design complexity. The PGA (Programmable Gain Amplifier) module in the AGC loop adopts the combination of coarse tuning part and fine tuning part, which not only has high precision, but also has a large dynamic range, and only needs the amplifier gain of fine tuning part to be variable. In the coarse tuning part, the fixed gain amplifier can be used to control the opening and closing of the amplifier by digital signal, which further reduces the design complexity. The range of gain adjustment of RF receiving link controlled by this algorithm is 102 dB, and the variation precision is 2 dB. The dynamic range of low noise amplifier module is 32 dB, which is divided into-2 dB and 30dB states, and the dynamic range of programmable amplifier in loop is 70 dB. There are four fixed gain amplifiers with 14dB gain and four variable resistor amplifiers with dynamic range of 14dB with varying precision of 2dB. According to the results of the five peak detectors, the two parts are controlled, corresponding to the low noise amplifier control module and the programmable amplifier control module, and the gain allocation adjustment module is added to optimize the noise coefficient in the circuit. The functional simulation of the algorithm is completed in the ModelSim SE software, and the layout is designed by EDA tools such as Design Compiler integrated, Soc Encounter layout and routing.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN92
【共引文獻】
相關(guān)期刊論文 前10條
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2 安杰;邳雪松;李揮;馬建設(shè);程雪岷;林家用;;用于PDIC的跨阻放大器的優(yōu)化設(shè)計[J];半導(dǎo)體光電;2009年05期
3 謝凌寒;吳金;汪少康;李艷芳;吳毅強;;寬輸入共模范圍電壓比較器的設(shè)計[J];半導(dǎo)體技術(shù);2007年12期
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