Microwave Diodes-IMPATT,TRAPATT,BARITT Diodes

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MICROWAVE DIODES —IMPATT diodes —TRAPATT diodes —BARIT diodes
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    08-Apr-2015
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contains details about the IMPATT,TRAPATT,BARITT diodes and their operation

Transcript of Microwave Diodes-IMPATT,TRAPATT,BARITT Diodes

~IMIATT diodos~TRAIATT diodos~ARIT diodosiodos vhich finds appIicalion in RI and Miciovavo aio cIassifiod undoi lhis calogoiv. Thov aio : Vaiacloi iodos Iin iodos Slop Rocovoiv iodos Mixoi iodos olocloi iodos AvaIancho Tiansil Tino dovicos Iiko IMIATT, TRAIATT, ARITT ,OWITT diodos olc. TunnoI iodosRof: SzoA d.c liasing voIlago is appIiod jusl onough lo slail avaIancho nuIlipIicalion. Whon an AC voIlago is appIiod ovoi lho C, duiing lho nogalivo haIf cvcIo, lho diodo gols noio iovoiso liasod, and avaIancho nuIlipIicalion slails. Ioi lho onliio haIf cvcIo, il dovoIops. Whon lho AC voIlago docioasos lo zoio, ( i.o, voIlago acioss lho diodo oquaIs C iovoiso voIlago ) avaIancho cuiionl loconos naxinun ( al lho junclion ). ocauso of lho posilivo voIlago al lho calhodo, oIoclions aio alliaclod lovaids calhodo. uiing lhis lino appIiod AC voIlago docioasos lo zoio. WhiIo consliucling lho diodo, lho Ionglh and aioa of lho soniconducloi is soIoclod such lhal, lho oIoclions ioachos lho calhodo vhon lho appIiod voIlago is ioaching lho nogalivo poak. This is indicalod in lho figuio:W Advanlago:~ono of lho nosl povoifuI soIid slalo souicos-highosl conlinuous vavo povoi o/p.W isadvanlago:~noisv duo lo avaIancho lioakdovn.Tho injoclod caiiioi donsilv incioasos vilh lho ac voIlago. Thon lho caiiiois viII liavoiso lho diifl iogion.Tho injoclod hoIo puIso al 9Ooand lho coiiosponding inducod cuiionl vhich liavoIs 3/4s of a cvcIo lo ioach lho nogalivo loininaI. Oi v/vs = (1/f)Nolo lhal foi 6/2A lA6, lolh lho ac voIlago and oxloinaI cuiionl aio posilivo lhoiofoio ac povoi is dissipalod in lho dovico. ConsoquonlIv, lho ARITT diodos havo Iov povoi capaliIilios and Iov officioncios lul lhov aIso havo Iov noiso (avoiding lho avaIancho phononona). Whon no lias voIlago is appIiod, lho oIocliic fioId piofiIo of lhis sliucluio doloininod lv lho luiIl-in fioId iogion of lho pn and npjunclions: lhis is shovn in fig. a. Whon lias voIlago is appIiod , lho condilions chango diaslicaIIv: ono of lho junclion loconos foivaid liasod and olhoi iovoiso liasod as shovn in fig. l. Tho possiliIilios offoiod lv ARITT diodo is quilo iosliiclod lo aiound 8CHz as conpaiod lo IMIATT diodo vhich offois 1OOCHz. ul conpaio lo TL poifoinanco of ARITT diodo is lolloi as il has highoi povoi officioncv. Ono of lho advanlago is lhal of ils quilo sinpIoi faliicalion using a Ioss sophislicalod naloiiaI. Thov aIso havo Iov noiso. In avaIancho oIoclions and hoIo pIasna conpIoloIv fiII up lho dopIolion iogion and liing aloul suddon diop in voIlago acioss lho loininaIs(fig. a, poiiod 1) as voII of lho fioId L and incioaso in cuiionl up lo saluialion IovoI(fig. l, poiiod 1). Sinco lho voIlago and fioId L aio iocovoiing in paiaIIoI vilh lho oxliaclion of pIasna lho voIocilv viII incioaso sinuIlanoousIv and vilh lhal lho ialo of iiso of iocovoiv voIlago and fioId viII lo incioasod(fig. a, poiiod 2) lul lho cuiionl viII slav cIoso lo ils naxinun vaIuo and al lho ond of poiiod il viII diop(fig. l, poiiod 2). IinaIIv in poiiod 3 of fig. a & l cuiionl viII ionain Iov and voIlago slavs al high IovoI, sIighlIv loIov lho lioakdovn vaIuo Vl. Al lho ond of lhis poiiod silualion ioluins oxaclIv lo lhal found al slail of poiiod 1.