130nm CMOS Wideband Power Amplifier for LTE/LTE-A

Transcription

1 Journl o Scence Technology Engneerng nd Mngeent-Advnced eserch & Innovton Vol., Issue, Jnury 08 30n MOS Wdebnd Power Apler or TE/TE-A Fsl Abdul Hd, Veeryh Thngsy & Shnkr Durknnn As Pcc Unversty, Technology Prk Mlys, Bukt Jll 5700, Kul upur, Mlys sl_69@hotl.co Abstrct: Multbnd operton o oble trnscever becoes n essentl eture o G/TE nd uture councton systes. Use o two or ore power plers PAs n the srtphone trnscever need to be replced by sngle wdebnd PA to nze sttc power consupton besdes reducton o ootprnt re. Ths pper presents the desgn o wdebnd PA by proposng new tchng network clled s ltered nput output tchng network FIOMN. The proposed tchng network provdes wde bndwdth nd lso proves lnerty by hronc suppresson. The proposed PA s desgned usng ndustry stndrd 30n MOS process. The desgned PA covers requency rnge o 770MHz to 90MHz coverng 7 TE requency bnds. The xu output power o 8.dB wth 7dB s lner power t -db pont. A vlue o -35dBc s cheved t -db output power nd thus stsyng the odern TE lnerty requreent speccton s well. Keywords: Adjcent chnnel lekge rto A, power pler, error vector gntude EVM, tchng network, ltered nput output tchng network FIOMN.. Introducton Power plers PA n essentl prt o do Frequency F trnssson syste ncludng oble councton re requred to operte on wde rnge o requences to ull the growng nuber o requency bnds; besdes t eets the lnerty, output power, djcent chnnel lekge rto A, error vector gntude EVM requreents. PAs hve been opertng closely to ther sturton regon where sgncnt degrdton o PA perornce wll occur especlly t hgh ecency nd hgh power [,, 3,, 5]. Thereore, t s crucl tht dstortons cused by PA nonlner behvour to be elnted. eovl o dstorton hve been typcl proble n PA used or vrous pplctons. In ddton, these dstortons cused by PA hve been unvodble due to nonlner behvour o devces lke trnsstors nd dode used n the PA desgn [,, 3,, 5]. Thus, t hs been necessry to desgn PA tht would eet the councton stndrds o current nd uture oble councton systes. PA or tody nd uture counctons systes should ensure brod coverge o requences by ncorportng ultode ultbnd MMMB etures n ts desgn [,, 3,, 5]. Mtchng network plys n portnt role n the desgn o PAs to cheve hgher output power nd hgher ecency wth nu dstortons. In PA desgn, presence o tchng network s sgncntly portnt to xze the power trnserred between source nd lod [,, 5]. In ult-user councton, the nonlner hroncs generted by power plers cn lso be reduced by proper desgn o tchng network. Power pler wth proper tchng network desgn sultneously provdes better perornce or other preters s well tht nclude error vector gntude EVM, nd djcent chnnel lekge rto A [,, 3,, 5]. urrent ourth generton G oble phones requre two dscrete power plers to operte t low requences o 850/900MHz, nd hgh requences o 700/900/00/600MHz [, 6]. However, sngle 3

2 30n MOS Wdebnd Power Apler or TE/TE-A Fsl Abdul Hd power pler hs been opted by the PA s rket tht cn operte over wde requency rnge ro 770 MHz to 700MHz [,, 5]. The ncrese n power pler s bndwdth proportonlly ncreses the nonlnerty o the sgnl ledng to sgncnt degrdton o PA s perornce. The nonlner behvour o PA leds to reducton o oble phone s bttery le due to PA s hgher consupton o power, whch lso degrde the EVM nd A [,, 3, ]. However, the technology trend such s ong Ter Evoluton TE nd TE-Advnced TE-A requres wder bndwdth PA wthout beng degrded n the bove preters [7, 8, 9, 0,, ]. The power trnstted nd receved hs been one o the key ctors tht nluences the dt rte nd the bt error rte o oble network. Wth prose o 00Gbps nd 0Gbps dt rte on low nd hgh oblty respectvely by the TE-A stndrd, the power trnstted plys crucl role n provdng the hgh dt rte, whch n turn depends on the lnerty o the power pler [3,, 5, 6, 7, 8, 9, 0]. On the other hnd, the pek to verge power rto PAP o the orthogonl requency dvsonl ultplexng OFDM odulton dopted to cheve hgh dt rte uels the nonlnerty o the power pler [,, 3,, 5, 6]. Thereore, n pproprte tchng network or power pler s requred nd t should d or the wder bndwdth nd proved ecency requreents or the power pler [8, 9, 30, 3, 3]. Thereore, PA operton n wde bndwdth rnge s requred whle t the se te stsyng or other preters speccton. In ths pper, sngle wdebnd power pler through pednce tchng network t nput nd output s desgned to operte on wde rnge o requences between 770MHz to 90MHz usng on-chp.. Methodology Ths reserch ocus s to desgn PA or requences opertng ro 770MHz to 90MHz. These specctons coply wth IMT stndrds o opertng TE/TE-A throughout the world. The ltered nput output tchng network FIOMN proposed n ths reserch s ed to prove the key preters o the PA, nely bndwdth nd the output power. The desgn PA long wth the nput nd output tchng networks re nlysed or cheveent o lner power output nd wde bndwdth. The perornce trx o lnerty nlyss s EVM nd A. Furtherore, the power pler would then be optzed by provng the power pler bndwdth nd the output power. Mtchng network technque would llow the power pler to xze the ecency whle te vryng pltude nd phse dstortons t extended lner regon. ouncton systes opertng between G nd beyond TE/TE-A extends over requency rnge o 770MHz to 700MHz. The PA rchtecture together wth proposed tchng network s shown n Fgure. An nput tchng crcut, whch s cobnton o network together wth coposte lter s used n ths desgn. The network provdes necessry pednce trnsorton whle the coposte lter provdes hronc suppresson. On the other hnd, the output tchng crcut s desgned usng -derved bnd pss lter rchtecture whch provde both pednce trnsorton nd hronc suppresson. The hronc suppresson s requred to reduce dstortons cused by hroncs nd t s suppressed by use o lters t nput nd output tchng network. The proposed PA desgned wth ltered nput output tchng network FIOMN s shown n Fgure. The dopted PA desgn enbles to ncrese the VDD supply to the trnsstors to 3.3V wthout exceedng the trnsstor s oxde brekdown potentl. Here, the trnsstors re dvded nto two cells to reduce the eect o prstc nd ts outputs re cobned by ens o -derved lters. Ths rchtecture cncels out ll the second hroncs ro the PA resultng n proved A perornce. Thus, proposed FIOMN

3 VDD VDD Journl o Scence Technology Engneerng nd Mngeent-Advnced eserch & Innovton Vol., Issue, Jnury 08 tchng wll provde good tchng nd proves ll the PA preters such s bndwdth, gn, output power, A nd EVM. Pn Mtchng Network Ipednce Trnsorton oposte Flter Hronc Suppresson PA PA -derved Flter -derved Flter Pout Input Mtchng Network Output Mtchng Network Fgure : Propose power pler structure wth nput nd output tchng networks Z o,pa Z,PA VDD 6 8 w w Output M 8 Input w w w3 w 3 M 9 w 0 Z VDD w Zs 5 w5 7 w 0 3 w M3 w6 M 3 w w 5 Fgure Wde bndwdth o PA wth proposed tchng network s n crcut dgr. Desgn Prncples 33

4 30n MOS Wdebnd Power Apler or TE/TE-A Fsl Abdul Hd The nput tchng network tht ncludes pednce trnsorton stge ollowed by coposte lter stge s desgned or n source pednce, Zs = 50Ω, PA nput pednce, Z,PA o.5-j6ω s esured usng cdence sulton. The nductve nd cpctve preters o the nput tchng network s deterned usng equtons to 3 [33]: c Where o 50Ω nd c o 90 MHz ro equtons nd re known s nput resstnce nd crrer requency. Fro equtons nd, t cn be deduced tht c 3 The desgn equton or cpctnce nd nductnce or the tchng network t nput sde re expressed s n equton nd 5: c 5 c Where equton lso pples to the clculton or nd 3. Slrly, equton 5 pples to nd 3. The eleents vlue o coposte lter whch s prt o the nput tchng network s derved through equtons 6 to 9: Where 0

5 Journl o Scence Technology Engneerng nd Mngeent-Advnced eserch & Innovton Vol., Issue, Jnury Where s the lower cut-o requency o 770MHz nd s the upper cut-o requency o 90MHz. Also, represents the coecent o the -derved secton. In ddton, the equtons derved would ensure PA s tched to the nput tchng network n ters o proved bndwdth. Slrly, the output tchng network s desgned wth esured output pednce o PA, Zo,PA s.- j0.6ω nd the lod, Z = 50Ω. The eleents vlue o output tchng network s derved through equtons to 9 [33]: Where

6 30n MOS Wdebnd Power Apler or TE/TE-A Fsl Abdul Hd 3. esults To deterne the bndwdth perornce o the desgned wdebnd PA, S-preter nlyss hs been crred usng cdence nd the correspondng results re shown n Fgure 3. Fgure 3: S-Preters o wdebnd PA The desgned PA hs wde bndwdth o.ghz rngng ro requency o 770MHz to 90MHz coverng 7 TE bnds: -6, 8-, 7-, -7, 33, 35, 39, 5, 66 & 70 bnds s shown n Fgure 3. The S-preter results show gn S o 6dB. The relecton coecent S nd S re below 0dB plyng tht tchng network provdes optu perornce throughout the bndwdth. esults o the perodc stedy stte nlyss, tht relects the output power perornce o the PA s shown n Fgure. Fro the results ts clerly evdent tht the pek output power s 8.dB nd the lner output power o 7dB t -db copresson pont. Furtherore, the results clerly ndcte the desgned PA dheres wth the output power requreent o 3±dB s per TE speccton [6]. Fgure : Output power o the wdebnd PA

7 Journl o Scence Technology Engneerng nd Mngeent-Advnced eserch & Innovton Vol., Issue, Jnury 08 Fgure 5: Output spectrl or TE Slrly, A nlyss o the desgned PA s shown n Fgure 5 ples tht n A -35dBc hs been cheved or the PA output power t 7dB whch s dbc better thn thn the A requreent o TE whch s 33dBc [6]. Tble shows the coprson o the desgned wdebnd PA wth stte-o-the-rt PAs n the lterture. The coprson tble clerly ndcted tht the desgned PA hve n pprecble ncrese n the output power wth wde bndwdth o.ghz nd reduced A o -35dBc. Tble oprson o esults terture Output Power Pout, Frequency rnge Bndwdth A db GHz GHz dbc [] [3] [8] [3] [8] Ths eserch oncluson The novel Mtchng network clled s ltered nput output tchng network FIOMN s proposed, desgned nd sulted t TE bnds. The results obtned led to expected rnge o opertng requences ro 770 to 90MHz t output power o 8.dB wth A o -35dBc. The proposed tchng network llows the PA to operte wth optu perornce over 7 TE bnds. The proposed PA cn be prctcl soluton whle there s strong dend or MMMB PA. 37

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