对数放大器在弱光检测中的应用

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1,2,1(1.,450001;2.,453000):,,LOG100。,,,LOG100。,1nW,LOG100,1nW,A/D,。:;;;;;LOG100:TN39:A1674-6236(2010)05-0122-03ApplicationoflogarithmicamplifierindetectionofweakopticalsignalMEIXin-li1,2,LIChang-qing1(1.SchoolofInformationEngineering,ZhengzhouUniversity,Zhengzhou450001,China;2.InstituteofPhysics,XinxiangUniversity,Xinxiang453000,China)Abstract:Inordertoextractthesignalsubmergedinthenoiseindetectioncircuit,thehigh-precisionamplifiers,especiallylogarithmicamplifiers,wereusedtoincreasethecapacityoffilteringoutthenoise,oneofthedesignswasaphotoelectricdetectioncircuitusinganintegratedlogarithmicamplifierLOG100aspreamplifier.Accordingtosuchacircuit,thewayofselectingtheparametersoftheelectroniccomponentswasraisedindesigningthelow-noiseweak-opticaldetectioncircuit,andtheoutputsofLOG100weredetected.Actualmeasureresultsshowthatwhentheinputopticalsignalpowerisabove1nW,LOG100performsagoodnoisefiltering.Butwhentheinputopticalpowerislessthan1nW,thenoiseinoutputsignalismarkedlyenhanced.SuchphenomenonmayresultintheA/Dconversiongivingerroroutputs,andmakeagainsttofollow-updataprocessing.Keywords:weakopticalsignal;detection;photoelectricconversion;logarithmicamplifier;noise;LOG100ElectronicDesignEngineering18Vol.185No.520105May.2010:2010-02-09:201002017:(1978—),,,。:。,,A/D。、。,,,,。,;,,,。,、,,,[1-2]。,LOG100[3]。11.1[3]1。A,RFCF,u1=SPRF,,S,P。,RF,RF,IBVBIBRF1+RFRS!VB,RS。,RF,。。OPA111,0.8pA,100μV。,RFMΩ,,。1.2[4-9]mV,,。LOG100。1LOG100,1nA~1mA,(FSO)-122-0.37%,0.1%。,,。LOG1004,,,[1-2,5-8]。[1-2]LOG100:VOUT=R11+R21R11VTlnI1I2VOUT=R11+R21R112.3VTlogI1I22,S1227-66BPIN,,。,,±10V,。555,T=105ms。。LOG100,I2,I2=μ2R21,μ2。mV,LOG100,1nA~1mA,I1,I2105。1R11,R21kΩ,,,μ2mV。,,RFCF,,。2(a)P=0.7nW,,,1,A/D,,,,。2(b),,0.02,A/D。,LOG100,,,。31.4nW()()0.1V。4PVOUT,4,pW,LOG100mV,A/D。LOG100。4,,,,A/D,。LOG100,,LOG100,,,,。,LOG101LOG104,LOG100,100pA~3.5mA,0.01%FSO。LOG101LOG104,LOG100。,,(-5~75℃),。3LOG100,1,-123-《》20105:[1].[M].:,1994:51-61.[2].[M].:,2008:10-50.[3].[J].:,2007(9):30-31.[4].[M].:,2000:40-100.[5].[M].:,2007:157-160.[6].Matlab[M].:,2005:121-150.LOG100,。,,。:[1],.()[J].,2005(04A):127-128.[2],.[J].,2006,13(1):110-112.[3],.[J].,2003,27(3):193-196.[4].LOG100[J].,2000(2):15-16.[5]TI/BURR-BROWN.LOG100[EB/OL].(2000-09-27)[2009-12-01].[6]TI/BURR-BROWN.LOG101Datasheet[EB/OL].(2004-06-10)[2009-12-01].[7]TI/BURR-BROWN.LOG104Datasheet[EB/OL].(2005-04-04)[2009-12-01].[8]TI/BURR-BROWN.OPA111Datasheet[EB/OL].(2000-09-27)[2009-12-01].[9],,,.[J].,2007,2(4):61-64.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(121)/LMH1983(NationalSemiconductorCorporation)(3G/HD/SD)/,。LMH1983。,,40ps(),FPGA/(SMPTE)。LMH19833(PLL)、(VCXO)。,。LMH19834(LVDS),,FPGA,“”。LMH1983,,/。LMH1983SMPTE(SDI)AES3/EBU,1080p(HD)、、、。,LMH1983FPGASMPTE424M(148.5MHz148.5/1.001MHz)。“”,LMH1983,。,LMH1983。LMH1983,43,40LLP。,LMH1981/、SDI27MHz,(SD)、(2)3。LMH1983,、、/。LMH1983HVF27MHz、10MHz32/44.1/48/96kHz。,I2C,。LMH19833.3V,。,/,。:2010051013-124-

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