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rf and p r otec ti on d evic es b gs f110 g n26 applic atio n n ote a n 306 revision : rev. 1.0 2014 - 11 - 28 sp 10t an tenna s wi tc h mo dul e wi th g pi o i nte rfac e , 2 g s mt x por ts fo r mul ti - m od e gs m/ e d g e, wc d m a o r lte ap pli c ations mai n rf f ront end a pplic ati on s
edition 2015 - 01 - 21 published by infineon technologies ag 81726 munich, germany ? 2015 i nfineon technologies ag all rights reserved. legal disclaimer the information give n in this applicatio n note is given as a hint for the implementation of th e infineon technolog ies component only a nd shall not be regarded as any desc ription or warranty of a certain functionalit y, condition or quality of the infin eon technologies com ponent. the recipien t of this applicatio n note must verify any function described h erein in the real ap plication. infineon technologies hereby disclaims any and al l warranties and liabilities of any k ind (including without l imitation warranties of non - infringement of inte llectual property rights of a ny third party) with respect to any and a ll information given in this application not e. information for further information on technol ogy, delivery terms and conditions and prices, please contact the nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements, components may contain dangerous substances. for in formation on the types in question, please contact the nearest infineon technologies office. infineon technologies components may be used in life - support devices or systems only with the express written approval of infineon technologies, if a failure of su ch components can reasonably be expected to cause the failure of that life - support device or system or to affect the safety or effectiveness of that device or system. life support devices or systems are intended to be implanted in the human body or to supp ort and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
BGSF110GN26 antenna switch module with integrated gpio interface application note an306 , rev. 1.0 2014 - 11 - 28 3 / 23 application note an306 revision history: 2014 - 11 - 28 previous revision : n ot applicable ; this is 1 st version page subjects (major changes since last revision) trademarks of infineon technologies ag aurix?, c166?, canpak?, cipos?, cipurse?, coolgan?, coolmos?, coolset?, coolsic?, corecontrol?, crossave?, dave?, di - pol?, drblade?, easypim?, econo bridge?, econodual?, econopack?, econopim?, eicedriver?, eupec?, fcos?, hitfet?, hybridpack?, isoface?, isopack?, i - wafer?, mipaq?, modstack?, my - d?, novalithic?, omnitune?, optiga?, optimos?, origa?, powercode?, primarion?, primepack?, primestack?, profet ?, pro - sil?, rasic?, real3?, reversave?, satric?, sieget?, sipmos?, smartlewis?, solid flash?, spoc?, tempfet?, thinq!?, trenchstop?, tricore?. other trademarks advance design system? (ads) of agilent technologies, amba?, arm?, multi - ice?, keil?, primecell ?, realview?, thumb?, vision? of arm limited, uk. ansi? of american national standards institute. autosar? of autosar development partnership. bluetooth? of bluetooth sig inc. cat - iq? of dect forum. colossus?, firstgps? of trimble navigation ltd. emv? of emvco, llc (visa holdings inc.). epcos? of epcos ag. flexgo? of microsoft corporation. hyperterminal? of hilgraeve incorporated. mcs? of intel corp. iec? of commission electrotechnique internationale. irda? of infrared data association corporation. iso? of international organization for standardization. matlab? of mathworks, inc. maxim? of maxim integrated products, inc. microtec?, nucleus? of mentor graphics corporation. mipi? of mipi alliance, inc. mips? of mips technologies, inc., usa. murata? of murata manufacturing co., microwave office? (mwo) of applied wave research inc., omnivision? of omnivision technologies, inc. openwave? of openwave systems inc. red hat? of red hat, inc. rfmd? of rf micro devices, inc. sirius? of sirius satellite radio inc. solar is? of sun microsystems, inc. spansion? of spansion llc ltd. symbian? of symbian software limited. taiyo yuden? of taiyo yuden co. teaklite? of ceva, inc. tektronix? of tektronix inc. toko? of toko kabushiki kaisha ta. unix? of x/open company limited. veri log?, palladium? of cadence design systems, inc. vlynq? of texas instruments incorporated. vxworks?, wind river? of wind river systems, inc. zetex? of diodes zetex. last trademarks update 2014 - 07 - 17
BGSF110GN26 antenna switch module with integrated gpio interface list of content, figures and tables application note an306 , rev. 1.0 2014 - 11 - 28 4 / 23 table of content s 1 introduction ................................ ................................ ................................ ................................ ........ 6 2 BGSF110GN26 features ................................ ................................ ................................ .................... 6 2.1 main features ................................ ................................ ................................ ................................ ...... 6 2.2 functional diagram ................................ ................................ ................................ .............................. 6 2.3 pin configuration ................................ ................................ ................................ ................................ .. 7 2.4 pin description ................................ ................................ ................................ ................................ ..... 7 3 application ................................ ................................ ................................ ................................ .......... 8 3.1 application board ................................ ................................ ................................ ................................ . 9 4 small - signal characteristics ................................ ................................ ................................ ........... 10 4.1 insertion loss from antenna port to respective rf ports ................................ ................................ 10 4.2 forward transmission gsm tx ................................ ................................ ................................ ........... 11 4.3 reflection antenna port to all ports ................................ ................................ ................................ ... 13 4.4 port reflection gsm tx ports ................................ ................................ ................................ ............ 14 4.5 isolation ................................ ................................ ................................ ................................ .............. 15 5 non - linear performance of BGSF110GN26 ................................ ................................ .................. 16 5.1 intermodulation ................................ ................................ ................................ ................................ ... 16 5.1.1 intermodulation measurement setup ................................ ................................ ................................ . 17 5.1.2 intermodulation measurement conditions ................................ ................................ .......................... 18 5.1.3 imd test results for band 1 and 5 ................................ ................................ ................................ .... 18 6 harmonic distortion ................................ ................................ ................................ ......................... 19 6.1.1 harmonic generation measurement conditions ................................ ................................ ................. 19 7 abbreviations ................................ ................................ ................................ ................................ ... 21 8 authors ................................ ................................ ................................ ................................ .............. 22
BGSF110GN26 antenna switch module with integrated gpio interface list of content, figures and tables application note an306 , rev. 1.0 2014 - 11 - 28 5 / 23 list of figures figure 1 BGSF110GN26 functional diagram ................................ ................................ ................................ ..... 6 figure 2 BGSF110GN26 pin configuration ................................ ................................ ................................ ......... 7 figure 3 BGSF110GN26 in a mobile phone front end ................................ ................................ ....................... 8 figure 4 layout of the application board ................................ ................................ ................................ ............ 9 figure 5 layout of de - embedding through and half boards ................................ ................................ ......... 9 figure 6 pcb layer information ................................ ................................ ................................ ........................ 10 figure 7 application circuit ................................ ................................ ................................ ............................... 10 figure 8 forward transmission antenna port to trx ports ................................ ................................ ............... 11 figure 9 forward transmission gsm tx ports ................................ ................................ ................................ .. 12 figure 10 forward transmission trx2 over temperature ................................ ................................ ................... 12 figure 11 reflection antenna port to all trx ports ................................ ................................ ............................ 13 figure 12 port reflection gsm tx ports ................................ ................................ ................................ .............. 14 figure 13 isolation neighbour ports ................................ ................................ ................................ .................... 15 figure 14 isolation trx to tx1 port ................................ ................................ ................................ ................... 15 figure 15 isolation trx to rx2 port ................................ ................................ ................................ .................... 16 figure 16 block diagram of rf switch intermodulation ................................ ................................ ...................... 17 figure 17 intermodulation measurement test setup ................................ ................................ ........................... 17 figure 18 set - up for harmonics measurement ................................ ................................ ................................ ... 19 figure 19 harmonics at f in =824 mhz ................................ ................................ ................................ .................. 20 fi gure 20 harmonics at f in =1710mhz ................................ ................................ ................................ ................. 20 list of tables table 1 pin description (top view) ................................ ................................ ................................ ..................... 7 table 2 insertion loss from antenna port to rf ports (all other ports terminated with 50ohm resistance) .. 10 table 3 insertion loss from antenna port to gsm tx ports (all other ports terminated wit h 50 ohm resistance) ................................ ................................ ................................ ................................ .......... 11 table 4 return loss from antenna port to rf ports (all other ports terminated with 50ohm resistance) ....... 13 table 5 return loss from antenna port to gsm tx ports (all other ports terminated with 50 - ohm resistance) 14 table 6 test conditions of imd measurements ................................ ................................ ............................... 18 table 7 imd measurements ................................ ................................ ................................ ............................ 18 table 8 harmonic generation measurement conditions ................................ ................................ ................. 19
BGSF110GN26 antenna switch m odule with integrated gpio interface introduction application note an306 , rev. 1.0 2014 - 11 - 28 6 / 23 1 introductio n the BGSF110GN26 is a single - pole ten - throw (sp10t) antenna switch module (asm) optimized for mobile phone and wireless applications for operating frequencies up to 3.8 ghz. it is a perfect solution for multi - mode handsets based on quadband gsm, wcdma and lte. the switch module configurati on is shown in figure 1 and supports a wide supply voltage range of 2.4 to 3.3 v. the module comes in a miniature tsnp package and is comprise d of a high power cmos sp10t switch , an integrated gpio controller , and harmonic filters for gsm low - band and hig h - band transmit paths. the on - chip controller integrates cmos logic and level shifters, driven by control inputs from 1.35 to 3.1 v. e xternal dc blocking capacitors are not required in typical applications provided that dc voltages are not applied to any r f port. 2 BGSF110GN26 features 2.1 main features ? suitable for multi - mode gsm / edge / wcdma / lte / lte - advanced applications ? frequency range of 100 mhz to 2.7 ghz ? ultra - low insertion loss ? integrated gsm transmit filters ? 8 interchangeable, high - linearity wcdma trx ports ? 2 high - linearity gsm tx paths ? high port - to - port isolation ? integrated mipi rffe interface ? no dc decoupling capacitors required, if no dc applied on rf lines ? small form factor: 3.2 mm x 2.8 mm x 0.73 mm 2.2 functional dia gram figure 1 bg s f 110g n26 f unctional d iagram b g s f 1 1 0 g _ f u n c t i o n a l _ d i a g r a m . v s d t x _ h b t x _ l b g p i o c o n t r o l l e r h a r m o n i c f i l t e r s v 1 v 2 v d d g n d v 3 a n t t r x 1 t r x 2 t r x 3 t r x 4 t r x 5 t r x 8 s p 1 0 t t r x 6 t r x 7 v 4
BGSF110GN26 antenna switch m odule with integrated gpio interface bgsf110 gn26 features application note an306 , rev. 1.0 2014 - 11 - 28 7 / 23 2.3 pin configuration figure 2 BGSF110GN26 p in c onfiguration 2.4 pin description table 1 pin d escription (top view) pin no name pin type function 0 gnd gnd ground, die pad 1 gnd gnd dc ground 2 trx4 i/o wcdma trx port 3 trx5 i/o wc dma trx port 4 trx6 i/o wcdma trx port 5 gnd gnd rf ground 6 gnd gnd rf ground 7 ant i/o antenna port 8 gnd gnd rf ground 9 gnd gnd rf ground 10 tx2 i gsm hb port 11 gnd gnd rf ground 12 gnd gnd rf ground 13 tx1 i gsm lb port 14 gnd gnd rf gro und 15 trx8 i/o wcdma trx port 16 gnd gnd rf ground 17 trx7 i/o wcdma trx port 18 trx1 i/o wcdma trx port 19 trx2 i/o wcdma trx port 20 trx3 i/o wcdma trx port 1 8 1 4 2 1 2 6 v d d v 4 v 3 v 2 v 1 g n d t r x 4 t r x 5 t r x 6 g n d g n d g n d a n t t x 1 g n d g n d t x 2 g n d g n d t r x 3 t r x 2 t r x 1 t r x 7 g n d g n d t r x 8 p g - t s n p - 2 6 - 2 3 . 4 x 2 . 6 m m 4 0 0 m p a d p i t c h
BGSF110GN26 antenna switch m odule with integrated gpio interface application application note an306 , rev. 1.0 2014 - 11 - 28 8 / 23 table 1 pin d escription (top view) pin no name pin type function 21 gnd gnd dc ground 22 vdd pwr supply voltage 23 v4 i gpio control pin 24 v3 i gpio c ontrol pin 25 v2 i gpio control pin 26 v1 i gpio control pin 3 application a typical use of the BGSF110GN26 asm in a mobile - phone application is shown in figure 3 . i n the m ain antenna path of the rf front end , t he infineon BGSF110GN26 routes the antenna signal to the required band - depend e nt front end components (e.g. duplexers, filters, pa), which in turn are connected directly to the transceiver ic . for the diversity path , infineon recommends its rf switches su ch as the bgs15an16. infineon also offers a broad portfolio of l ow - n oise a mplifiers (lnas) that are optimized for the receive path in mobile - phone applications . figure 3 BGSF110GN26 in a mobile phone front end infineon rf switch infineon lnas bgaxx infineon asm BGSF110GN26 t r a n s c e i v e r a s m m a i n d i v e r s i t y
BGSF110GN26 antenna switch m odule with integrated gpio interface application application note an306 , rev. 1.0 2014 - 11 - 28 9 / 23 3.1 application board shown b elow is a picture of the ev aluation boar d (evb) used for all measurements ( figure 4 ). th is evb is designed such that all 50 - ohm connecting lines have the same length. in order to obtain accurate values for insertion loss measuremen ts of the BGSF110GN26 , all influences and losses of the evb , lines , and connectors have to be eliminated. therefore a separate de - embedding board representing the line length is necessary ( figure 5 ). the calibra tion of the n et w ork a nalyser (nwa) is done in six steps: 1) perform full calibration on all nwa ports. 2) attach special sma connector ( use same as solder e d to evb with no inner con ductor ) to port 2 and perform open port extension. turn the port extensions on. 3) connect the half de - embedding board ( figure 5 right board) between port 1 and port 2 , and store this as a n s - parameter (.s2p) file. now t urn all port exten s ions off. 4) load the stored s - parameter file of the half de - embedding board as the de - embedding file for all nwa ports used. 5) now s witch all port extentions on. 6) cross - c heck the insertion loss with the through de - embedding board ( figure 5 left board) please note : o n pcb , trx7 is rx 1 and trx 8 is rx2 figure 4 layout of the application board figure 5 layout of de - embedding t hrough and h alf board s the evb is made of a sandwich of fr4 and rogers 04002 , and has 3 layers. the l ayer stack is shown in figure 6 .
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 10 / 23 figure 6 pcb layer information 4 small - signal characteristics the small - signal characteristics we re measured at 25 c using a vector network a nalyzer (vna) , a supply voltage , vdd, of 3.0 v , a nd the application circu it shown in figure 7 . figure 7 application circuit 4.1 insertion loss from antenna port to respective rf ports table 2 insertion l oss from a ntenna port to rf port s ( all other ports terminated with 50 ohm resistance ) frequenc y (mhz) 704 716 740 751 824 881 915 942 1710 1842 1960 1970 2017 2140 2170 2350 2593 2690 3500 trx1 0.62 0.62 0.61 0.61 0.6 0.6 0.59 0.6 0.69 0.71 0.73 0.73 0.75 0.79 0.8 0.89 1 1.1 1.7 trx2 0.63 0.62 0.62 0.62 0.6 0.6 0.6 0.6 0.68 0.7 0.72 0.72 0.74 0.7 7 0.78 0.85 0.99 1.1 1.7 trx3 0.65 0.64 0.64 0.64 0.61 0.61 0.61 0.61 0.67 0.68 0.7 0.7 0.71 0.75 0.76 0.83 0.97 1 1.6 trx4 0.63 0.62 0.62 0.62 0.6 0.6 0.6 0.6 0.68 0.7 0.72 0.72 0.73 0.77 0.78 0.86 1 1.1 1.8 trx5 0.62 0.61 0.61 0.61 0.61 0.62 0.62 0.62 0.74 0.75 0.76 0.76 0.77 0.81 0.82 0.9 1.1 1.2 2 trx6 0.59 0.59 0.58 0.58 0.57 0.57 0.57 0.57 0.72 0.75 0.79 0.79 0.82 0.88 0.9 1 1.3 1.4 2.3 trx7 (rx1) 0.62 0.61 0.61 0.61 0.6 0.61 0.61 0.61 0.73 0.74 0.75 0.75 0.76 0.79 0.79 0.85 0.98 1 1.7 trx8 (rx2 ) 0.63 0.62 0.62 0.62 0.59 0.59 0.59 0.59 0.72 0.71 0.71 0.71 0.72 0.75 0.76 0.84 0.98 1 1.6 copper 35 m rogers04002 , 0. 2 mm fr4 , 0. 7 mm vias 2 7 n h a n t b g s 1 8 m n 1 4 s p 8 t
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 11 / 23 figure 8 forward t ransmission a ntenn a port to trx ports 4.2 forward transmission gsm tx table 3 insertion l oss from a ntenna port to gsm tx ports (all other ports terminated wit h 50 ohm resistance ) frequency (mhz) 704 716 740 751 824 881 915 942 1710 1842 1960 1970 2017 2140 2170 2350 2593 2690 3500 tx1(lb) 0.69 0.69 0.71 0.71 0.75 0.79 0.81 0.82 1.1 1.2 1.3 1.3 1.4 1.9 2.1 4 8.5 11 47 tx2(hb) 1 1 1 1 1 0.97 0.96 0.97 43 31 28 28 28 28 28 30 36 41 25 0 1 2 3 4 frequency (ghz) forward transmission trx ports -3 -2.5 -2 -1.5 -1 -0.5 0 forward transmission (db) 3.5 ghz -2.34 db 3.5 ghz -1.553 db 2.14 ghz -0.7452 db 2.14 ghz -0.8789 db 0.704 ghz -0.5907 db db(|s(2,1)|) trx1 db(|s(2,1)|) trx2 db(|s(2,1)|) trx3 db(|s(2,1)|) trx4 db(|s(2,1)|) trx5 db(|s(2,1)|) trx6 db(|s(2,1)|) rx1 db(|s(2,1)|) rx2
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 12 / 23 figure 9 forward transmission gsm tx port s figure 10 forward t ransmission trx2 over t e mp erature 0.0003 2 4 6 frequency (ghz) forward transmission tx ports -60 -50 -40 -30 -20 -10 0 forward transmission (db) 1.862 ghz -1.193 db 0.883 ghz -0.7937 db 3.476 ghz -50.61 db 2.729 ghz -42.78 db 1.714 ghz -43.18 db hb lb -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 500 1000 1500 2000 2500 3000 forward transmission frequency trx2 , -20 trx2, 25 trx2, 85
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 13 / 23 4.3 reflection a ntenna port to all p orts table 4 return l oss from a ntenna port to rf ports (all other ports terminated with 50 ohm resistance ) frequ ency (mhz) 704 716 740 751 824 881 915 942 1710 1842 1960 1970 2017 2140 2170 2350 2593 2690 3500 trx1 17.3 17.4 17.7 17.7 18.4 18.7 18.8 18.9 20.2 20.5 20.3 20.3 20.1 19.4 19.1 17.5 15 14 10.3 trx2 17.3 17.4 17.6 17.7 18.4 18.7 18.8 18.8 19.8 20.1 20.1 20.1 20 19.5 19.4 18.1 15.7 14.6 10.3 trx3 16.9 17.1 17.4 17.5 18.4 19 19.2 19.4 22 22.1 21.7 21.7 21.3 20.2 19.9 17.8 15.1 14.1 10.2 trx4 17.5 17.7 18 18.1 18.9 19.4 19.6 19.7 20.7 20.8 20.4 20.4 20.1 19.1 18.8 17 14.6 13.5 9 trx5 17.9 17.9 18 18 18.1 17.9 17.8 17.7 17.5 18.1 18.5 18.5 18.6 18.4 18.3 17.2 14.6 13.4 8.24 trx6 18.9 19.1 19.5 19.6 20.4 20.7 20.7 20.8 18 17.3 16.4 16.4 16 14.9 14.7 13.1 11.1 10.4 7.05 trx7 (rx1) 17.5 17.6 17.8 17.8 18 18 17.9 17.9 17.1 17.5 17.8 17.9 18 18.1 18.1 17.9 16. 6 15.5 10.2 trx8 (rx2) 17 17.2 17.5 17.6 18.6 19.3 19.5 19.8 22.2 22.4 21.9 21.8 21.5 20.1 19.8 17.7 15.2 14.3 10.8 figure 11 reflection a ntenna p ort to all trx ports 0.0003 2 4 6 frequency (ghz) reflection tr ports -30 -25 -20 -15 -10 -5 0 reflection (db) trx1 trx2 trx3 trx4 trx5 trx6 db(|s(1,1)|) rx1 db(|s(1,1)|) rx2
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 14 / 23 4.4 port reflection gsm tx ports table 5 return l oss from a ntenna port to gsm tx ports (all other ports terminated with 50 - ohm resistance ) frequency (mhz) 704 716 740 751 824 881 915 942 1710 1842 1960 1970 2017 tx1 (lb) 11.0 11.1 11.2 11.4 12.9 15.4 18.4 22.4 tx2 (hb) 18.2 18.0 17.6 17.4 16.1 15.2 14.9 14.7 13.1 12.9 11.7 11.6 10.8 figure 12 port reflection gsm tx p orts 0.0003 2 4 6 frequency (ghz) reflection tx ports -40 -30 -20 -10 0 reflection (db) 1.899 ghz -16.15 db hb lb
BGSF110GN26 antenna switch m odule with integrated gpio interface small - signal characteristics application note an306 , rev. 1.0 2014 - 11 - 28 15 / 23 4.5 isolation figure 13 isolation n eighbour p orts figure 14 isolation trx to tx1 port 0.0003 3 6 8.5 frequency (ghz) isolation_neighbour_ trx -120 -100 -80 -60 -40 -20 0 db(|s(2,1)|) isolation_rx1_trx2 db(|s(2,1)|) isolation_trx1_ttrx2 db(|s(2,1)|) isolation_trx3_ttrx2 db(|s(2,1)|) isolation_trx3_ttrx4 db(|s(2,1)|) isolation_trx5_ttrx4 db(|s(2,1)|) isolation_trx5_ttrx6 0.0003 2 4 6 frequency (ghz) isolation trx_to_tx1 -120 -100 -80 -60 -40 -20 db(|s(2,1)|) isolatio_rx2_ttx1 db(|s(2,1)|) isolation_rx1_ttx1 db(|s(2,1)|) isolation_strx6_ttx1 db(|s(2,1)|) isolation_trx1_ttx1 db(|s(2,1)|) isolation_trx2_ttx1 db(|s(2,1)|) isolation_trx3_ttx1 db(|s(2,1)|) isolation_trx4_ttx1 db(|s(2,1)|) isolation_trx5_ttx1
BGSF110GN26 antenna switch m odule with integrated gpio interface non - linear performance of BGSF110GN26 application note an306 , rev. 1.0 2014 - 11 - 28 16 / 23 figure 15 isolation trx to rx2 port 5 non - l inear p erformance of bgsf 110g n 26 smart phones today can operate across several cellular bands covering gsm / edge / cdma / umts / wcdma / lte/td - scdma / td - lte / lte - a. the design of the rf front - end part in modern cellular phones is becoming increasingly complex and demanding due to the increasing number of frequency bands and modes that the phone needs to support . one of the main components of the rf front - end is the antenna switch that selects which transmitter (tx)/receiver (rx) path can be connected to the antenna. the rf switch has to satisfy high linearity requirement s . the fol lowing material describes some of the main challenges of antenna switches in mobile applications. modern smartphones are multi - mode devices that are capable of connecting to 2g, 3g and 4g networks. these networks often use different frequency bands. the sm artphones rf frontend must therefore include band - specific components. in order to appropriately route signals for a given mode and band of operation, a high - performance rf switch is an essential component of the front - end circuitry . the performance requi rements of the rf swtich are discussed in the following sections. 5.1 intermodulation intermodulation distortion (imd2 and imd3) is a parameter that describes the linearty of a device under multi - tone conditions. the intermodulation between different frequency component s generates undesired output frequencies at the sum and difference frequencies of the input tones , and at multiples of those sum and difference frequencies. 0.0003 2 4 6 frequency (ghz) isolation_trx_to_tx2 -120 -100 -80 -60 -40 -20 db(|s(2,1)|) isolation_rx1_ttx2 db(|s(2,1)|) isolation_rx2_ttx2 db(|s(2,1)|) isolation_strx5_ttx2 db(|s(2,1)|) isolation_strx6_ttx2 db(|s(2,1)|) isolation_trx1_ttx2 db(|s(2,1)|) isolation_trx2_ttx2 db(|s(2,1)|) isolation_trx3_ttx2 db(|s(2,1)|) isolation_trx4_ttx2
BGSF110GN26 antenna switch m odule with integrated gpio interface non - linear performance of BGSF110GN26 application note an306 , rev. 1.0 2014 - 11 - 28 17 / 23 some of these possible intermodulation scenarios are shown in figure 16 . in this example, the transmitted (tx) signal from the main antenna is coupled into the diversity an tenna with high power. this signal (20 dbm) and a received j ammer signal ( - 15 dbm ) are entering the switch. certain combination s of the tx and jammer frequencies are producing second - and third - order intermodulation products that fall into the desired reception band , and reduce the sensitivity of the receiver. figure 16 block diagram of rf s witch intermodulation 5.1.1 intermodulation measure ment setup figure 17 intermodulation m easurement t est s etup p a p a p a t x 1 r x 1 t x n r x n r x 1 r x 2 / 3 r x n b t w l a n n a v i g a t i o n w i f i f m d i v e r s i t y c b r a d i o t v . . . m a i n l o a d s i g n a l g e n e r a t o r p o w e r a m p l i f i e r c i r c u l a t o r - 2 0 d b s i g n a l a n a l y z e r - 6 d b - 6 d b d u p l e x e r t x r x a n t p h a s e s h i f t e r / d e l a y l i n e s i g n a l g e n e r a t o r d u t - 2 0 d b p o w e r r e f e r e n c e p l a n e r e g a r d i n g s p e c i f i c a t i o n t x a n t t u n a b l e b a n d p a s s f i l t e r - 3 d b t u n a b l e b a n d p a s s f i l t e r b l o c k e r s i g n a l i m d p r o d u c t r e f e r e n c e p l a n e - 6 d b *
BGSF110GN26 antenna switch m odule with integrated gpio interface non - linear performance of BGSF110GN26 application note an306 , rev. 1.0 2014 - 11 - 28 18 / 23 a requirement of t he test setup for imd measurements is high isolation between the rx and tx signals ( figure 17 ). in practice, a laboratory - grade duplexer w ith an isolation of 80 db is used. table 6 shows the test specification for band 1 and band 5 . 5.1.2 intermodulation measurement conditions table 6 test conditions of imd measurements band 1 tx interferer imd product tes t case f in (mhz) p in (dbm) cw f in (mhz) p in (dbm) cw f imd (mhz) imd3 1950 20 1760 - 15 2140 imd2 low 190 imd2 high 4090 band 5 test case f in (mhz) p in (dbm) cw f in (mhz) p in (dbm) cw f imd (mhz) imd3 835 20 790 - 15 880 imd2 low 45 imd2 hi gh 1715 the results for b and 1 and b and 5 are given in table 7 . 5.1.3 imd test results for band 1 and 5 table 7 imd m easurements band 1 tx interferer intermodulation products umts band 1 test case f in (mhz) p in (d bm ) f in ( mhz ) p in ( dbm ) f imd ( mhz ) p imd ( dbm ) iipx ( dbm ) imd3 1950 20 1760 - 15 2140 - 10 7 66 imd2 low 1950 20 190 - 15 2140 - 93 98 imd2 high 1950 20 4090 - 15 2140 - 1 04 1 09 band 5 tx interferer intermodulation products umts band 5 test case f in (mhz) p in (dbm ) f in ( mhz ) p in ( dbm ) f imd ( mhz ) p imd ( dbm ) iipx ( dbm ) imd3 835 20 790 - 15 880 - 123 74 imd2 low 835 20 45 - 15 880 - 9 2 97 imd2 high 835 20 1715 - 15 880 - 10 5 11 0
BGSF110GN26 antenna switch m odule with integrated gpio interface harmonic distortion application note an306 , rev. 1.0 2014 - 11 - 28 19 / 23 6 harmonic distortion harmonic distortion is another important param eter for the characterization of an rf switch. rf switches have to withstand high rf levels, up to 36 dbm. this high rf power at the input of a switch generates harmonics of the waveform that is present . these harmonics (2 nd and 3 rd ) can interfere with ot her reception bands or can cause distortion in other rf applications (gps, wlan) within the mobile phone. . figure 18 set - up for harmonics measurement 6.1.1 harmonic generation measurement conditions table 8 harmonic g eneration measurement c onditions tx harmonic products f i n (mhz) p in (dbm), 50% dc f h2 (mhz) f h3 (mhz) 824 203 8 tx lb port 1648 2472 2030 trx lb ports 1800 203 8 tx hb port 3600 54 00 2030 trx hb ports the results for the harmonic generation at 8 24 mhz and 1710 mhz are shown in figure 19 for tx1 and figure 20 tx2 . t he input power (pin) is plotted on the x axis, and the generated harmonics in dbm on the y axis . l o a d s i g n a l g e n e r a t o r p o w e r a m p l i f i e r c i r c u l a t o r t u n a b l e b a n d p a s s f i l t e r - 2 0 d b d i r e c t i o n a l c o u p l e r d i r e c t i o n a l c o u p l e r t u n a b l e b a n d s t o p f i l t e r s i g n a l a n a l y z e r - 3 d b k & l p o w e r m e t e r a g i l e n t e 4 4 1 9 b a b - 2 0 d b - 2 0 d b d u t t x a n t
BGSF110GN26 antenna switch m odule with integrated gpio interface harmonic distortion application note an306 , rev. 1.0 2014 - 11 - 28 20 / 23 figure 19 harmonic s at f in =824 mhz figure 20 h armonic s at f in = 1 71 0 mhz harmonic generation harmonic generation -90 -80 -70 -60 -50 -40 -30 -20 -10 0 20 25 30 35 40 harmicics [dbm] pin [dbm] harmonic gereration @ 824 mhz tx1 h2 h3 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 20 25 30 35 40 harmonics[dbm] pin [dbm] harmonic gerneration@1710mhz tx2 h2 h3
BGSF110GN26 antenna switch m odule with integrated gpio interface abbreviations application note an306 , rev. 1.0 2014 - 11 - 28 21 / 23 7 abbreviations asm antenna switch module cmos complementary metall - oxide - semiconductor edge enhanced data rates for gms evolution fr4 material for pcb gpio general purpose input output gps global positioning system gsm global system for mobile communication lte long - term evolution lte - a lte advanced pa power amplifier pcb printed circuit board sma sub miniature version a rodgers material for rf pcbs rf radio frequency td lte time division lte td - scdma time division synchronou s code division multiple access tsnp thin small non leaded package umts universal mobile telecommunications system w - cdma wideband code division multiple access wlan wireless local area network
BGSF110GN26 antenna switch m odule with integrated gpio interface authors application note an306 , rev. 1.0 2014 - 11 - 28 22 / 23 8 author s andre dewai , senior appli cation engineer of the business unit rf and protection devices ralph kuhn , senior staff application engineer of the business unit rf and protection devices
w w w . i n f i n e o n . c o m published by infineon technologies ag an306

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BGSF110GN26E6327XTSA1 BGSF110GN26E6327XTSA1TR-ND	Infineon Technologies AG	IC RF SWITCH SP10T 3.8GHZ TSNP26		0

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