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《wsn射頻收發(fā)芯片中低功耗復(fù)數(shù)帶通濾波器設(shè)計和實(shí)現(xiàn)的論文》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要無線傳感器網(wǎng)絡(luò)(WirelessSensorNetwork，WSN)是由大量無線傳感器節(jié)點(diǎn)構(gòu)成的，廣泛應(yīng)用在工業(yè)、農(nóng)業(yè)、軍事國防等領(lǐng)域。復(fù)數(shù)帶通濾波器位于WSN射頻接收機(jī)前端，它能夠?qū)⒔邮盏降膸?nèi)信號放大，帶外信號抑制，是WSN射頻接收機(jī)中的重要模塊，研究低功耗高性能的復(fù)數(shù)帶通濾波器對于無線傳感器網(wǎng)絡(luò)具有重要意義。本課題采用TSMCO．18“mRFCMOS工藝，設(shè)計并實(shí)現(xiàn)了應(yīng)用于無線傳感器網(wǎng)絡(luò)射頻收發(fā)芯片的復(fù)數(shù)帶通濾波器。該復(fù)數(shù)帶通濾波器為有源RC結(jié)構(gòu)，采用跳蛙式梯形級聯(lián)，具有較小的靈敏度和較高的線性度。濾波器使用兩級密勒補(bǔ)償運(yùn)算放大器作為其核心運(yùn)放單元，并采用自動調(diào)諧電路，減少工藝
2、角和溫度變化對濾波器的影響。本設(shè)計通過減少濾波器級聯(lián)級數(shù)、改進(jìn)跳蛙式梯形級聯(lián)結(jié)構(gòu)來降低濾波器的功耗。測試結(jié)果表明，電源電壓1．8V，復(fù)數(shù)帶通濾波器的中心頻率為1．994MHz，帶寬為0．572—3．416MHz，通帶增益約為．2dB，鏡像抑制比為32dB，鄰道抑制比為32dB，通帶紋波為0．6dB，自動調(diào)諧電路的精度為0．3％，功耗為7．38mW，整個芯片面積為1．44×0．7≈1．008mmz。本課題所設(shè)計的有源RC復(fù)數(shù)帶通濾波器已在WSN射頻收發(fā)芯片中使用，通過測試，性能良好。該模塊經(jīng)過調(diào)整，也可以應(yīng)用在其它無線通信收發(fā)芯片中。關(guān)鍵詞：無線傳感器網(wǎng)絡(luò)、低功耗、射頻收發(fā)機(jī)、有源RC、復(fù)
3、數(shù)帶通濾波器、自動調(diào)諧電路AbstractWirelessSensorNetwork(WSN)isawirelessnetworkcomposedoflargeamountsofsensornodes，whichiswidelyusedinindustry，agriculture，militaryaffairsandSOon．Complexbandpassfilter(BPF)islocatedinthefrontoftheWSNreceiver，whichcanmagnifytheusefulsignalinthepassbandandrestrainthesignaloutofthe
4、band．ItisofgreatimportancetodesignacomplexBPFwithlowpowerandgoodperformancefortheWSNtransceiver．AcomplexBPFwhichusedfortheWSNreceiverisdesignedandimplementedinthisthesis．ItisdesignedinTSMCO．18proRFCMOSprocessanduSesanactiveRCstructure．TheBPFisoflowsensitivityandhighlinearitybyusingtheleap—frogstr
5、ucture．TheBPFusestWOstageoperationalamplifierswithMillercompensationcapacityasitscoreamplifierunit，anditalsoadoptsanautomatictuningcircuitinordertoreducetheinfluenceofprocesscomer，temperatureandotheruncertainfactors．Thepowerconsumptionisreducedbecausethatfewerstagesandimprovedleap-frogstructureis
6、introducedtotheBPF．Thetestresultsofthechipshowthatthecenterfrequencyofthefilteris1．994MHz；thepassbandisbetWeen0．572MHzand3．416MHz．Thevoltagegainoffilterisabout-2dB，therippleinthepassbandisabout0．6dB．Theimagesignalrejectionratiois32dB，andtheadjacentchannelsignalrejectionratiois32dB．Theprecisionoft
7、heautomatictuningsystemiswithinO．3％．Thepowerconsumptionofthefilterisabout7．38mWunder1．8Vpowersupply．Thechipareais1．44×O．7≈1．008mlTl2．ThecomplexBPFhasbeenappliedtotheWSNreceiverandfunctionswell．AnditcallalsobeusedinRFtr
