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1、o8j18GHzo.2bv!9LCnull董建明1nullnull王安国1何庆国2郭文椹2李振国2(1?v0,?, 300072) (2S0S/v13,FE,050051)2007-04-12l, 2007-07-24lK1:T!9oz.2bv,kT:q8j18 GHzz=9mv30dB,9ml3 dB,.2l2.0 dB,o1l2. 5,1 dBq15.8 dBmbbvTh(Lb1oM:A0%Mq85;T;z.2bv;ms|:TN 722. 3DSM: AcI|:1000-3819( 2008)01-075-06Design and Implementation of 8j18GHzMicr
2、owave LowNoiseAmplifierDONG Jianming1WANG Anguo1HE Qingguo2GUO Wenzhen2LI Zhenguo2(1School of ElectronicInformationEngineering,TianjinUniversity, Tianjin,300072,CHN)( 2The 13th Institute,CETC,Shjiazhuang, 050051, CH N)Abstract: A broadband pHEMT low noise amplifier was designed and manufactured. Mi-
3、crostrip circuit and balanced techniques wereused to design the circuit. The amplifier was assem-bled on Al2O3substrate, covering the frequency of more than 1 octave band range from 8 GHz to18 GHz,achieving performances measured: gain 30 dB, gain flatness 30 dB,9mnull nullGnullPobv?/,H)TbvS11S22,bw)
4、Tobv+VUT,|),f/S11S22vlb)TobvS11:S11S11(1) + S11( 2)S21(1)S12( 1) +S11(3)S21(1)S12(1)S21(2)S12( 2)THBa=sYVUB)a=)QS11YbTVA,)S11Yy-)S21(n)S12( n)T7hlbnull= nullS21(n)S12(n)null= 0. 4H,)Y)%Qnull2= 0.16bqMH, S21(n)S12( n)S11(n)M9M,|tqMh,76BtqMFb,T)QM,iOnull= nullS21(n)S12(n) null0.4,*)bvQ)bvQ1+ null+ nul
5、l21.56b)bv,Q)bvQ1+ null+ null2+l= 1/ (1- null)1.67bZE9VsS22b3电路设计3.1!9TbvqBZT,s,sLaWilkin-76%80Z28sons(Lange coupler)bsLLCz!94, Wilkinsons?o1,7(Lange cou-pler)zz,B50%,iO?o1bLange couplerm2U,g,Lange couplerT1, 2T(5)T(6)bm2Fig. 2A coupled-line Lange couplerZ0O = Z0( 1 - c)/( 1+ c) 1/2(k - 1)(1 + q) /(
6、c + q) + (k - 1)( 1- c) (5)Z0e = Z0O (c + q) /(k - 1)(1 - c) (6)Tq: q= c2+ ( 1- c2) (k- 1) 2 1/2, Klange couplerL,7c,Z0gEFbpZ0oZ0e,VpMW/hS/hbLange couplerz?r,7O=MMMl,Yl2,#=ol1.15,yNLange couplerTbvXqbLangeLqsBo,1Yz,LangeHzW1Y,HzWz,lbWS1Y,WSl,v,go1Yb5,LangeWS!91pHWWN,?v- 3 dB,W#VNVZ4#HWbInLCZL,B?l35
7、nullmbLangeVbvo13bLange couplerT,yN)TbvVSWRz,OL)b3. 2Tbv!94Mnullr9.6ah0.5mmAl2O3(Lb854ESUMS3pHEMTEC2612,.2+bpHEMT EC2612Ez120 nullm,EL0.15 nullmbEL4o85Tq1oj,AELdL/d 1,7dvl|Y,yN4o85Tq4qsq,?KhlE4TqbpHEMT EC2612XC/Hq/EKqB,?9XCo.285?KqBbpHEMT EC26121?/:0.8 dB minimum noise figure 18 GHz1.5 dB minimum no
8、ise figure 40 GHz12 dB associated gain 18 GHz9.5 dB associated gain 40 GHz!9sjK(vl5mm10 mm0.5 mm,bv)8vl18 mm10 mm,nm8),R,6l|bv,q9v,BSi!91In1y,yNTbvZT41ZTb)T,)E3,PzzbL0zlM,PzziOz.29mbMHo.Z_,7vQ,KDL|bbvs),B)vKD.2!9,9mB,=a)vKv9m!9,Pbv9m,iP+KD4b)sY20 mAa30 mA50 mAbm3Ansoft Serenade_bv)m(Lange coupler9)bZT,YVm7UZTFb
