ࡱ> %&'()!Root Entry d F0%@%WordDocument) ddFObjectPool d<^^SummaryInformation (d, #/#$%&'()*+,-.023456789:;<=>?@ABCDEFGHIJKLMPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~CompObjjObjInfo5SummaryInformation1DocumentSummaryInformation,Root Entry d FÆ%@%WordDocument) ddFObjectPool d<^^SummaryInformation (d,LI$rr FMicrosoft Word Document MSWordDocWord.Document.69q N/# !"$%&'()*+,-.023456789:;<=>?@ABCDEFGHIJKLMPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~՜.+,0 HP\dl t| FER9 mGaAs MESFET Small Signal Amplifier Intermodulation Distortion Improvement by the Second Harmonic TerminationOh+'0$8DPd x    t I/C source impedance curves partly had the similar form as the circles of constant power gain (Fig. 2.a).  EMBED MgxDesigner  Fig. 2.a Constant IMD curves in source impedance plane (basic matching topology) These features demonstrate that IMD suffers small changes when constant gain is achieved with different source impedances. The output impedance plane displays slightly different curves, especially in angle between constant IMD and constant gain curves (Fig. 2.b).  EMBED MgxDesigner  Fig. 2.b Constant IMD curves in load impedance plane (basic matching topology) Source and load reflection coefficients are initial values for minimum IMD optimisation (they do not include second harmonic matching circuits). With optimal ZS(w) and ZL(w), IMD improvement of 4 dB was achieved with 1.3 dB gain drop. As the third-order nonlinear transfer function H3(w1,w1,-w2) depends on H2(w1,-w2), an attempt has been made to improve the third-order IMD by controlling the matching circuit parameters at 2w (2w2w12w2). This effect exists in the input and output matching circuits as well, because of the external and internal feedback and Cgs nonlinearities. To investigate the input and output circuit of the second harmonic impedance effect on IMD, the I/C variations were analysed for the specific amplifier topologies (Fig. 1.b). Described second harmonic circuit topology was inserted in the maximum gain optimised amplifier input and output matching circuits. IMD improvement of 1.53 dB was achieved without gain change. The associated source and load reflection coefficients for first harmonic remain unchanged but the second harmonic source and load terminations are rin2=1(-104o and ro2=1(30.5o respectively. Investigating only the source second harmonic circuit behaviour (Fig.3.a), (output matching circuit with optimum circuit values) there exists a range with source terminations which is degrading IMD value. Out of this range of source impedances IMD remained nearly constant.  EMBED Excel.Chart.5 \s  Fig. 3.a IMD (I/C)3 relation to source second harmonic impedance In case of the load second harmonic circuit impedance (Fig. 3.b), (input matching circuit with optimum circuit values) it can be shown a range with load terminations which is improving IMD value.  EMBED Excel.Chart.5 \s  Fig. 3.b IMD (I/C)3 relation to load second harmonic impedance Using the described topology, the changes in the I/C were found for pure reactive second harmonic terminations. Finally the highest improvement regarding IMD can be achieved by adding the second harmonic circuits to the matching networks. This method results in IMD of 86.41 dB at 2 GHz which is 5.8 dB improvement with 1.3 dB gain drop. IMD curves for all four cases are compared in Fig.4.  EMBED Excel.Chart.5 \s  Fig.4 IMD curves for all termination possibilities Proper terminations of input and output matching networks can significantly suppress or enhance the third-order IMD. There are many similarities between image recovery mixers [5] and the proposed method but the final results are quite different. The third-order IMD optimisation process results for minimal gain reduction and the I/C overall improvement. The final optimised amplifier parameters are: GT= 14.8 dB, rin=0.77(40.6o, ro=0.77(11.4o, rin2=1(-104.1o, ro2=1(o and I/C=IP3-IP0=-86.4 dB (DGT=1.3 dB, DI/C=5.8 dB). The results have been verified for this specific transistor model with an additional series feedback. 3. CONCLUSION The goal was to find the optimal load and source impedances that produce minimal third-order intermodulation distortion. The optimisation of ZS(w) and ZL(w) results in some I/C improvements. The paper points out the importance of matching circuits impedance control at the second harmonic. The method applied on the output circuit resulted in considerable IMD level improvement, while at the input circuit it can lead to IMD deterioration (Fig.3.a). The results could be of practical interest due to simple modifications of passive matching circuits. REFERENCES [1] G.M.LambrianܥhW ,e|#Fp ::==$=$=$=$>=@>>>>":>>QElV>>>>>>>>]B_B_B_BGB C DEXFDu$=>>>>>D@==>V>@@@>=>$=>]B0%H=b=^====>]B@y@ GAAS MESFET SMALL SIGNAL AMPLIFIER INTERMODULATION DISTORTION IMPROVEMENT BY THE SECOND HARMONIC TERMINATIONPRIVATE  Robert Nagy, Juraj Bartoli, Borivoj Modlic University of Zagreb, Faculty of Electrical Engineering and Computing Department of RadimGaAs MESFET Small Signal Amplifier Intermodulation Distortion Improvement by the Second Harmonic Termination Robert Nagy Normal.dot Nagy Robert41Microsoft Word for Windows 95@D F@?=@J`@7՜.+,08@ LT \ FER ocommunications and Microwave Engineering Unska 3, 10000 Zagreb, Croatia robert.nadj@fer.hr ABSTRACT The third-order intermodulation distortion in small signal MESFET amplifier has been analysed by means of the Volterra series representation. Some of the results for reactively terminated amplifier ports at the second harmonic frequency are presented hereby. It has been shown that the third-order IMD products are sensitive to the second harmonic reactances at the transistor input and output terminals. 1. INTRODUCTION Many nonlinear transistor models and analysis methods have been proposed in literature. The Volterra series approach has been found to be very useful to predict the intermodulation distortion in GaAs MESFET small-signal amplifiers [1]-[3]. Using a complete MESFET model [3], the intermodulation distortion sensitivity to source reflection coefficient was related to the MESFET's stability. A second-order product in the low frequency feedback has been used in [2] to reduce the third-order intermodulation distortion. This paper presents some results showing how the source and load impedances affect GaAs MESFET third-order intermodulation distortion (IMD) level. 2. NONLINEAR ANALYSIS In small signal operating conditions, the nonlinear transconductance (gate-voltage-dependent) and drain conductance (drain-voltage-dependent), can be modelled as two separate nonlinear controlled current sources. The capacitance Cgs is modelled as an ideal Schottky-barrier capacitance. At the operating frequency of 2 GHz, the transistor AT10650-5 is a conditionally stable element. Additional 1.4 nH source inductance is used to extend the allowable load impedance range. The passive matching circuit consists of a 50 W transmission line of variable electrical length, and a variable characteristic impedance quarter-wave transformer [1]. These variables can produce any desired impedances at the FET terminals (Fig.1.a).  EMBED MgxDesigner  a. .  EMBED MgxDesigner  b Fig.1 Amplifier with matching cirܥhW e|#Fp ::==$=$=$=$>=@>>>>":>>aElV>>>>>>>>mBoBoBoBGB C DEX%FDu$=>>>>>D@==>V>      <=>?@ABCDEFGHIJKDocumentSummaryInformation8<_9493381347]F^c_9493379851]Fcd_949475498 +]FdyT  !#$%(*-./023479=?CEIKOQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~@@@>=>$=>mBPd>H=b=^====>mB@@ GAAS MESFET SMALL SIGNAL AMPLIFIER INTERMODULATION DISTORTION IMPROVEMENT BY THE SECOND HARMONIC TERMINATIONPRIVATE  Robert Nagy, Juraj Bartoli, Borivoj Modlic University of Zagreb, Faculty of Electrical Engineering and Computing Department of Radiocommunications and Microwave Engineering Unska 3, 10000 Zagreb, Croatia robert.nadj@fer.hr ABSTRACT The third-order intermodulation distortion in small signal MESFET amplifier has been analysed by means of the Volterra series representation. Some of the results for reactively terminated amplifier ports at the second harmonic frequency are presented hereby. It has been shown that the third-order IMD products are sensitive to the second harmonic reactances at the transistor input and output terminals. _949466528%]FyT`g*_949478005F`g*`;_949478026 F`;<_949479657F<\# 1. INTRODUCTION Many nonlinear transistor models and analysis methods have been proposed in literature. The Volterra series approach has been found to be very useful to predict the intermodulation distortion in GaAs MESFET small-signal amplifiers [1]-[3]. Using a complete MESFET model [3], the intermodulation distortion sensitivity to source reflection coefficient was related to the MESFET's stability. A second-order product in the low frequency feedback has been used in [2] to reduce the third-order intermodulation distortion. This paper presents some results showing how the source and load impedances affect GaAs MESFET third-order intermodulation distortion (IMD) level. 2. NONLINEAR ANALYSIS In small signal operating conditions, the nonlinear transconductance (gate-voltage-dependent) and drain conductance (drain-voltage-dependent), can be modelled as two separate nonlinear controlled current sources. The capacitance Cgs is modelled as an ideal Schottky-barrier capacitance. At the operating frequency of 2 GHz, the transistor AT10650-5 is a conditionally stable element. Additional 1.4 nH source inductance is used to extend the allowable load impedance range. The passive matching circuit consists of a 50 W transmission line of variable electrical length, and a variable characteristic impedance quarter-wave transformer [1]. These variables can produce any desired impedances at the FET terminals (Fig.1.a).  EMBED MgxDesigner  a. .  EMBED MgxDesigner  b Fig.1 Amplifier with matching circuits at input and output (a). Same amplifier with additional second harmonic circuits at input and output (b). The matching circuit output impedance at the second harmonic frequency is always 50 W. Therefore the second-order distortion component has always the same effect on the third-order IMD. Additional elements in the matching circuit produce pure reactive component at 2w that is controlled by the transmission line length (Fig.1.b). A relatively small frequency difference (1 MHz) of the excitation signal components, allows the following approximations: Z(w1+w2) Z(2w1) Z(2w2). In the first step the MESFET amplifier was optimised on the basis of maximum power gain to get the feeling for the third-order IMD optimisation process. After this first step, the amplifier parameters were: GT=16.07 dB, rin=0.77(38.0o, ro=0.77(21.6 o and (I/C)3=IP3-IP0= -80.6 dB. IP3 is power level at third order distortion frequency (2w1-w2) or (2w2-w1) and IP0 is the fundamental frequency component power level. 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MTT-33, No.12, Dec. 1985. [2] Y.Hu, J.C.Mollier, J.Obregon:"A New Method of Third-Order Intermodulation Reduction in Nonlinear Microwave Systems", IEEE Trans. on MTT, vol. MTT-34, No.2, Feb.1986. 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(I/C)3 [dB]---'-- - _LT---'-- - ,---'-- - ,- - -' , '  ' ,-4'mall-Signal Amplifiers", IEEE Trans. on MTT, vol.37, No.9, Sept. 1989. [4] J.C.Pedro,J.Perez:"Accurate Simulation of GaAs MESFET's Intermodulation Distortion Using a New Drain-Source Current Model", IEEE Trans. on MTT, vol. MTT-42, No.1, Jan.1994. 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O=C@CR?OcRK@~ h@Qi>R(@܀#pUD ?&pB@0' ?)[Z J@~ h@u<)@V/IUǺ?4@B@lV}?2ZGUXJ@ ~  h@ (D!T)@ Pkw$U o\? !YnA@ Օ@'IL?/$jG@~ h@n2d-@o%;pT-?:u<=@W 3?p|%F@~ h@].@Xj^TA+0du?)?<@9b->?1%pF@~ h@.@V RTt)*?m{;@T?^o%E@~ h@i5$D/@'o|KTÞvk?yZ:@g??/$vE@~ h@}W/@ILT/ǵ?UHI9@?M#D@~ h@Bi/@r)UT?҇8@RI&?܀#|D@~ h@0@'UHeT\Ɏ@?V+~7@je?Z!C@~ h@Tƿϸ0@Y{T6qr?qZ𢯘6@~ XS@dF C@~ @镲 0@4.ɊT~T?~ @~T?~ @~ i@"0@('UHTGG? h4@~ XS@\r)B@~  i@/@HPscTbX9?L3@je?WI B@~ 0i@/@S"HT]P2?V2@RI&?R,A@~ @i@ e/@ CTt3?3.1@?L$zA@~ Pi@Tގ/@QOT4c?#2⍜0@g??jt@@~ `i@( .@{cT<,?e9/@T?ŧ@@~ pi@PCH.@ zTL? )?9-@9b->?#J{/4?@~ i@= -@ m9Ta7l[?'":+@W 3?5l/:>@Dl\Bzzzzzzvrvzzzzzz !@"@#$%&'(P)*+~ i@ Md-@ ]oT gy? w( 9)@ 'IL? x&1@=@~ !i@!rh,@!&:T!t^c?!מ9'@!.Q?!3F<@~ "i@"Mr,@"Xs`T"^2?"P9%@"y@ٔ+?"y]`7L;@~ #i@#eS.+@#rhT#s?#*P8#@#%;6?#|~!?%#GGl@%Օ + =  dMbP?_*+%&APage &P"??U ,@@P    G YG@PPDY Date: 2/16/1998; time:mQß?Circuit: NLFEOPT.CKTf [GHz]GT [dB]IM [dB] rout [mag.] rout [ang.] rin [mag.] rin [ang.]~ g@#GG'@YiR Vx@e?d2@@wW?e6N@~ g@֭(@d`TU]k?&S[?@^x?뭁M@~ g@|y(@ ܺUBiq?FB[ΥP>@4Op?9(aM@~ g@'" )@.QUG?x? E=@CR?IONjL@~ h@:zަ)@ϠU=~?͍ ;<@0' ?O`L@~ h@5#)@ Ua?P1/;@lV}?:dwK@ ~  h@ C`*@ &ptU Ciq? #bJ$:@ ՕW*@ QIbU -l? |~9@ v? #J@ ~ @h@ a0+@ p|%SU g? j&k 8@ %;6? {NzJ@ ~ Ph@ -l+@ To lFU >M? Mb7@ y@ٔ+? 7̢I@ ~ `h@ }?5^+@ {k`=U 3? &p5@ .Q? K&I@~ ph@s;,@ GĔ6U-?S"4@'IL?ׁsH@~ h@F,@!uq3U $ ?ʦ\3@W 3?E.H@~ h@bh,@3Ul g?@M-[2@9b->?G@~ h@lscz-@Y8U?|?51@T?Y95G@~ h@,C2-@'†W@U;i?~:0@g??}?5^F@~ h@}͍Y-@ WMU?mC/@?}˜.=F@~ h@48Ew-@E_UDio?&-@RI&?~W[E@~ h@⪲-@uU<?E/Xn +@je?77',EE@~ h@T-@S:XUuT5A?^zk`(@~ XS@*D@~ @ O-@ǺU}b?~ Б@~T?~ @~ i@[ -@X0_Ut^c?_$@~ XS@nC@~  i@@ٔ+{-@oꐛYUZӼ?[%X"@je?cbqmTC@~ 0i@('b-@yS,UQ?Yn @RI&?@x=B@~ @i@ .V@-@B=UJR?BxqĚ@?j\B@~ Pi@c('U-@YU`?JYX@g??Zd;A@~ `i@('UH,@uv28JUdu?UHI@T?A_cA@~ pi@ׁsF,@`Ux@e?q&@9b->?ׁ@@~ i@d,y,@(' Up|%?bg @W 3?Sk@@Dl\Azzzzzzvrvzzzzzz !@"@#$%&'(P)*+~ i@ ('UH9,@ 1%eU /n? m{r? 'IL? J{/L?@~ !i@!+@!o_U!_YiR ?!zrK?!.Q?!=If>@~ "i@"+@"=U"Y?"HQ,׿"y@ٔ+?"vöE=@~ #i@#!Yd+@#PfU#1ZGU?#[='#%;6?#>>tA<@~ $i@$++@$ yU$Ĭ?$ % $v?$m;@~ %i@%C4*@%I +U%VI?%y] %Օ>tA&lV}?&0|D :@~ 'j@'ܺ:$*@'g?U'jjZ_$?'LJ'0' ?'`q89@~ (j@( )@(U(b(?(GZ*oG8(CR?(Aȓ8@~ ) j@)y;i{)@)QU)xWf,?)<D^)4Op?)pW#7@~ *0j@*0r.%)@*28J^U*|a2U0?*V !*^x?*^/ +6@~ +@j@+=(@+*sU+ܝ.4?+:#J{#+wW?+}i25@zzzzzzzzzzz> + =  dMbP?_*+%&APage &P"2??U ,@@P    G YG@PPDY Date: 2/16/1998; time:?Circuit:NLFE.CKTf [GHz]GT [dB]IM [dB] rout [mag.] rout [ang.] rin [mag.] rin [ang.]~ g@NE*-'@!A 3Uԕ?XE@@_)Ǻ?7M@~ g@ySQ(@St$Uܵ|?vi}?@],σ?C4@\Ɏ@?$SL@~ g@i5$D)@UMuUQOI?|ʄ_b=@w;S?$~KL@~ h@ r߹)@cՐU3f?:T<@W?K@~ h@9#J+*@YrU2Y?e G;@7?"~ZK@ ~  h@ =yX*@ 5bU Mu? d9:@ \ʾ? |%J@ ~ 0h@ ]zk+@ f2}TU iW!'? ]ʾ+9@ :H? 䠄iJ@ ~ @h@ sb+@ .4GU ͪ? u8@  Tƿ? ~k I@ ~ Ph@ WI+@ ƊL U +?,&6G-@je?DִE@~ h@tzzzvzvvzvlzzzzz !@"@#$%&'(P)*+~ i@ RI&B,@ GĔH:U eF ^? Q5U@ ̯? :KT@@~ !i@!-l,@!9U!L?!=!7 ?!T?!=;k-?@~ "i@"ZӼ+@"?9U"\wb?"䠄¿"M(D?"x<>@~ #i@#VFv+@#M8U#ͪ?#>$@M-# Tƿ?# K=@~ $i@$Z {,-+@$9(a7U$iW!'?$ݘ$:H?$&jjZ<@~ %i@%6!*@%?6U%Mu?%{p %\ʾ?%G`i;@~ &i@&T*@&9(a5U&2Y?&ao&7?&{x:@~ 'j@'E*@'4)5U'3f?'b'W?'+p9@~ (j@(*5{)@(d`T4U(QOI?(x@e(w;S?(18@~ ) j@)b)@)03U)4c?) %)\Ɏ@?)Kvl7@~ *0j@*O;5YS)@* q3U*ܵ|?*U[r!*],σ?*7۴6@~ +@j@+&)@+eN3U+ԕ?+k+#+_)Ǻ?+$bJ$5@zzzzzzzzzzz> + =  dMbP?_*+%&APage &P&~?'~?(~?)~?MHP LaserJet IIIPR IIs -Z-pc,hA4 %''''"dhh `? `?U}  } m  &;@@P    G YG@PPDY inputoutputarg [0] inp. (I/C)3 [dB]  arg [0] out. (I/C)3 [dB]  U  aG\`bI_J`LLbFM@c@Nd@P e@R f@ @T d@@V c@ѿ @X @b@@[a@(@^_@4@a@~@@f@@l@@t@"ȴ@@P@ҹ@s@@ @ܿ@@T@ 4@t@:@Ŀ@w0@Ͽ@I@ٿ;Ԭ9,R98::A"<D%l7r""""""""""""""""""""""""""""" !@"@#$% F >!KT"PA#RC$UD%W FDd"""""]>` i@A@` p  =&APage &PMHP LaserJet IIIPpc ,,A4 %''''" d,??33$$3Q:k inp. 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Mgxgre v1.00   I--&${t{aycbLNNLKKa_x`wt{t$ yvvtsyryv&$atrRsQSLLTUtSvuaa$ _S_UaTKJNSNQLRbc_-B( - &&-B$                              "$++UU+,TRRT,..,+"$HBHBA??GAEEGV$Xaflnw z | !$*,0369=CFIMPTV\_bdgtv|xzyw{t}n~lhea^[UQNKH~D}B{<y9x7v4t2r/g$d"b!_VTNI6,*!!"$&/ 2 4 79BDNXXNFD ; 9641*(&!%##, .6ILRT ]#`%b&e(n1p4r6t9u;w>yDzF{H{K|N|Q}U}[|^|a{e{hzjylwruutxrzp}eb`]ZTRPMIFC=9630.,&#!}z x uljdaXX$kkggk$yh@i?CCjAlylyh$??CC?$@@DD@$,ZZ,,$hhllh$l,l*j*.-ihl$,G,00G,G$GG$::]>]>:$&aUaUW&W&a-scqla\-$F[XVTQPNLJIGF CB C"A$@$?(@*@,B-B0E0F3I3J6M6O7P8R9S9T:W;X;Y<\@Z?Y?V=T=Q<P;N:M9J7H7G4D4C/>.>,<(<"="> =DEGHILMPQSVXY[$O<\=\=_>`?b@cAfBgBhDjDlFnGmFnHpHqKtLsKtMvOuOvRwSxWxXwZvZu[vapaodldkfigfheicjbj`l^l[m[iYjYhZh\g]f`eadccdcf`i`j]m]nXsXtVsUtTsQtQsOrLoLnHjHhFfFeDcDaC`B^A]A[?Z@Z<\Times New Roman CEwgw -Times New Roman CEwgw : - 2 3Z-Times New Roman CEwgw - 2 ,M0w -- 2 Zw-- 2 ,0w -- 2 Zw-- 2 ,2w -- 2 Zw-- 2 Lw-- 2 eZw-- 2 ~Sw -- 2 Zw-- 2 ,1w -- 2 >Vw-- 2 WSw Times New Roman CEwgw  -Times New Roman CEwgw ; - 2 QFET"!--"Systemwf  -nn.A55 ....()()))()()cuits at input and output (a). Same amplifier with additional second harmonic circuits at input and output (b). The matching circuit output impedance at the second harmonic frequency is always 50 W. Therefore the second-order distortion component has always the same effect on the third-order IMD. Additional elements in the matching circuit produce pure reactive component at 2w that is controlled by the transmission line length (Fig.1.b). A relatively small frequency difference (1 MHz) of the excitation snn.A55 ....()()))()() MEG:"\  phoenixH      "$*+,-./0123456789:;ignal components, allows the following approximations: Z(w1+w2) Z(2w1) Z(2w2). In the first step the MESFET amplifier was optimised on the basis of maximum power gain to get the feeling for the third-order IMD optimisation process. After this first step, the amplifier parameters were: GT=16.07 dB, rin=0.77(38.0o, ro=0.77(21.6 o and (I/C)3=IP3-IP0= -80.6 dB. IP3 is power level at third order distortion frequency (2w1-w2) or (2w2-w1) and IP0 is the fundamental frequency component power level. The constanou, C.S.Aitchison: "Optimization of Third-Order Inter-modulation Product and Output Power from an X-Band MESFET Amplifier Using Volterra Series Analysis", IEEE Trans. on MTT, vol. MTT-33, No.12, Dec. 1985. [2] Y.Hu, J.C.Mollier, J.Obregon:"A New Method of Third-Order Intermodulation Reduction in Nonlinear Microwave Systems", IEEE Trans. on MTT, vol. MTT-34, No.2, Feb.1986. [3] A.M.Crosmun, .A.Maas:"Minimization of Intermodulation Distortion in GaAs MESFET Small-Signal Amplifiers", IEEE Trans. on MTT, vol.37, No.9, Sept. 1989. [4] J.C.Pedro,J.Perez:"Accurate Simulation of GaAs MESFET's Intermodulation Distortion Using a New Drain-Source Current Model", IEEE Trans. on MTT, vol. MTT-42, No.1, Jan.1994. [5] J.Bartoli:"Conversion Matrix Analysis of Microwave Diode Mixers", Automa-tika,Vol.34,No.3-4, pp.121-125.,1993.  >      !"#$%&'()*+,-./0123456789:;<=@ABCDEFGHIJKLMPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXZ[\]^_`abcdefghklmnopqrstuvwxyz{|}~nn.A55 ....()()))()()nn.A55 ....()()))()() MEG:"\  phoenixH mnvwxyz\]g o ŻŰŨŝŨʼn||ytŰ `a cU``auD8`a KuD8]acvKuD8`a KuD8]acvKuD`a  ]`a  V`a hV`a U`a `a  ]a ca V]a Va Ua uD'CU]a cG CU]a cuDCU]a c U]a c- } ~ 789:;<=>?@ABDEFGHIJLMN"#/167;<?@EFKLVWZ[^_mnnoĻU`a uDؗ8`a KuDؗ8]acvKuD`a ^`a `a h J`a  ]`a `a hV`a  V]`a `a H Olmnopqrstvwx Ż`a h J`a  ]`a `a h V]`a  V`a hV`a U`a uD8`a KuD8]acvKuD`a  `a c`a E  8$/0\ 5    J`a `a hU`a uD8`a KuD8]acvKuD8`a KuD8]acvK `a ch `a c U`a cuDu8`a KuDu8]acvKuD`a `a `a h9  ()*+45FGHIJPQRST##n#o#z#{#|#i'l'm'n'uuD ]`a V`a hV`a U`a  ]`a `a h`a `a h$yz*I\]^_ij p &?&&&&&&&&)) )))))))))$))))$b)))))) 1%p 1%2,,%p q r s mnOP;89\78 ~!)))))))j)))))))v)))))2) )))) )))))) )))n))))v )))) 0,0,,,*~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)))))))))))))))))))))))))))))))))))))))))))) 0,0,!!G""l#m#n#p#q#r#s#u#v#x#y#z#{#|#j'k'l'm'n')))))))))),,0 0,0 0,0!K"@"Normal3 ]a c"A@"Default Paragraph Font+@ Endnote Text *@ Endnote Referenceh@ Footnote Text &@! Footnote Referenceh,@,TOC 10,$ (@(TOC 20,$ (@(TOC 3p0,$ (@(TOC 4@ 0,$ (@(TOC 50,$ &@&TOC 60,$@TOC 7 0,&@&TOC 80,$&@&TOC 90,$ * @*Index 1`,$ * @*Index 20,$ &.@& TOA Heading ,$"@CaptionO_Equation Caption_~ $& #_t ~ o ~ ))))    n'p ~!!n'p ~ :::::::~ ZZs u p ()=>==IIWW@ A E E G H M M T T [ \ r y Robert NagyD:\RADOVI\MELCON98\mele98.doc Robert NagyD:\RADOVI\MELCON98\mele98.doc Robert NagyD:\RADOVI\MELCON98\mele98.doc Robert NagyD:\RADOVI\MELCON98\mele98.doc Robert NagyD:\RADOVI\MELCON98\mele98.doc Ljerka Nuic"C:\Robert\radovi\mele98\mele98.doc Nagy RobertD:\radovi\mele98\mele98.doc Nagy Robert A:\mele98.doc Nagy Robert A:\mele98.doc Nagy Robert A:\mele98.doc@Hewlett Packard LaserJet 6LLPT1:winspoolHewlett Packard LaserJet 6LHewlett Packard LaserJet 6LpcXXLettereeeeeeeeeeeeeeeeeeeeeeeee O4''''Hewlett Packard LaserJet 6LpcXXLetterVERS\W32X86\ O4''''po p { | } ~ 00i'0 0 0m'0n#0y#0z#0{#lTimes New Roman Symbol &ArialBook AntiquaTimes New Roman CECG Times"9)ufm&") 9!)@lGaAs MESFET Small Signal Amplifier Intermodulation Distortion Improvement by the Second Harmonic Termination Robert Nagy Nagy RobertRobertŻŰŨŝŨʼn||ytŰ `a cU``auD8`a KuD8]acvKuD8`a KuD8]acvKuD`a  ]`a  V`a hV`a U`a `a  ]a ca V]a Va Ua uD'CU]a cG CU]a cuDCU]a c U]a c-