Funda malunga newotshi kwi-PCB

Qaphela le miba ilandelayo yewotshi ebhodini:

1. Uyilo

a, ikristale iwotshi kunye neesekethe ezinxulumene kufuneka zicwangciswe kwindawo esembindini we-PCB kwaye ibe nokwakheka okulungileyo, kunokuba kufutshane ne-interface ye-I/O. Isekethe yokuvelisa iwashi ayinakwenziwa kwikhadi lentombi okanye ifom yebhodi yentombi, kufuneka yenziwe kwibhodi yewotshi eyahlukileyo okanye ibhodi yokuthwala.

Njengoko kuboniswe kulo mfanekiso ulandelayo, inxalenye yebhokisi eluhlaza yoluhlu olulandelayo ilungile ukuba ungahambi umgca

b, kuphela izixhobo ezinxulumene nesekhethi yewotshi kwindawo yesekethe yewotshi yePCB, kuphephe ukubeka ezinye iisekethe, kwaye musa ukubeka ezinye imigca yemiqondiso kufutshane okanye ngaphantsi kwekristale: Ukusebenzisa indiza yomhlaba phantsi kwesekethe okanye ikristale eyenza iwashi, ukuba ezinye imiqondiso zidlula kwinqwelomoya, eyophula umsebenzi wenqwelomoya emephu, ukuba umqondiso wenqwelomoya udlula kwinqwelomoya yomhlaba omncinci, kwaye kuya kubakho ukujikeleza komhlaba, kunye nokujikeleza komhlaba, kuya kubakho ukujikeleza komhlaba kunye nokujikeleza komhlaba. iilophu ziya kubangela iingxaki kumaza aphezulu.

c. Kwiikristali zewashi kunye neesekethe zewashi, amanyathelo okukhusela angamkelwa ukusetyenzwa kokukhusela;

d, ukuba iqokobhe lewotshi liyintsimbi, uyilo lwePCB kufuneka lubekwe phantsi kobhedu lwekristale, kwaye uqinisekise ukuba le nxalenye kunye nenqwelomoya yomhlaba wonke inonxibelelwano oluhle lombane (ngokusebenzisa umhlaba omdaka).

Iingenelo zokugandaya ngaphantsi kweekristale zewotshi:

Isekethe ngaphakathi kwecrystal oscillator ivelisa iRF yangoku, kwaye ukuba ikristale ivalelwe kwindlu yentsimbi, iphini yamandla eDC kukuthenjwa kwereferensi yombane wombane we-DC kunye nereferensi ye-loop yangoku ye-RF ngaphakathi kwekristale, ikhupha umsinga odlulayo oveliswa yimitha ye-RF yendlu ngenqwelomoya ephantsi. Ngamafutshane, iqokobhe lesinyithi yi-eriyali enesiphelo esinye, kwaye umaleko okufutshane womfanekiso, umaleko weplanethi esemhlabeni kwaye ngamanye amaxesha iileya ezimbini okanye ngaphezulu zanele ukudityaniswa kwe-radiative ye-RF yangoku emhlabeni. Umgangatho wekristale nawo ulungele ukutshabalalisa ubushushu. Umjikelo wewotshi kunye nekristale yangaphantsi iya kubonelela ngenqwelomoya, enokunciphisa indlela eqhelekileyo yangoku eveliswa yikristale kunye newotshi ehambelana nayo, ngaloo ndlela inciphisa imitha ye-RF. Inqwelomoya ephantsi nayo ifunxa imowudi yokwahluka kweRF yangoku. Le nqwelomoya kufuneka iqhagamshelwe kwinqwelomoya epheleleyo ngamanqaku amaninzi kwaye ifuna imingxunya emininzi, enokubonelela nge-impedance ephantsi. Ukuphucula umphumo wale nqwelomoya, i-clock generator circuit kufuneka isondele kule nqwelomoya.

Iikristale ezipakishwe yi-Smt ziya kuba nemitha yamandla e-RF ngaphezulu kuneekristale ezigqunywe ngentsimbi: Ngenxa yokuba iikristale ezibekwe phezu komhlaba ubukhulu becala ziziipakethe zeplastiki, i-RF yangoku ngaphakathi kwekristale iya kukhanya esithubeni kwaye idityaniswe nezinye izixhobo.

1. Yabelana ngendlela yewotshi

Kungcono ukudibanisa umqondiso wokunyuka ngokukhawuleza kunye nomqondiso wentsimbi kunye ne-radial topology kunokudibanisa inethiwekhi kunye nomthombo omnye womqhubi oqhelekileyo, kwaye umzila ngamnye kufuneka uhanjiswe ngokuphelisa amanyathelo ngokuhambelana ne-impedance yayo.

2, iimfuno zomgca wothumelo lwewotshi kunye nokubekwa kwePCB

Umgaqo womzila wewotshi: Lungiselela umaleko opheleleyo wendiza yomfanekiso kwindawo ekufutshane yomaleko wewotshi, unciphise ubude bomgca kwaye ulawule i-impedance.

Iingcingo ezingalunganga zomaleko onqamlezayo kunye nokungahambi kakuhle kwe-impedance kunokubangela:

I-1) Ukusetyenziswa kwemingxuma kunye nokuxhuma kwi-wiring kukhokelela ekunyameni kwe-loop yomfanekiso;

2) I-voltage yokunyuka kwinqwelomoya yomfanekiso ngenxa yombane kwiphini yomqondiso wesixhobo itshintsha ngokutshintsha kwesignali;

3), ukuba umgca awuqwalasele umgaqo we-3W, iimpawu zewashi ezahlukeneyo ziya kubangela i-crosstalk;

Iingcingo zesignali yewotshi

I-1, umgca wewotshi kufuneka uhambe kumaleko angaphakathi webhodi ye-PCB eninzi. Kwaye qiniseka ukuba ulandela umgca weribhoni; Ukuba ufuna ukuhamba kumaleko angaphandle, ngumgca we-microstrip kuphela.

I-2, umaleko wangaphakathi unokuqinisekisa inqwelomoya yomfanekiso opheleleyo, inokubonelela ngendlela yokuhanjiswa kweRF ephantsi-impedance, kwaye ivelise i-magnetic flux ukuphelisa i-flux yamagnetic yomgca wabo wokuhambisa umthombo, ngokusondeleyo umgama phakathi komthombo kunye nendlela yokubuya, ngcono i-degaussing. Enkosi kwi-demagnetization eyongeziweyo, umaleko ngamnye ogcweleyo weplani yomfanekiso wePCB enoxinano oluphezulu ubonelela ngoxinzelelo lwe-6-8dB.

3, iingenelo zebhodi enamaleko amaninzi: kukho umaleko okanye iileya ezininzi ezinokuthi zinikezelwe kunikezelo lwamandla olupheleleyo kunye nenqwelomoya yomhlaba, inokuthi iyilwe ibe yinkqubo elungileyo yokuqhafaza, inciphise indawo yeluphu yomhlaba, inciphise imo yokwahlukana kwemitha, inciphise i-EMI, inciphise inqanaba lokuphazamiseka kwesiginali kunye nendlela yokubuya kwamandla, inokugcina ukuhambelana kwayo yonke imigca enqamlezayo, ukunciphisa i-impedance yomgca wonke, ukunciphisa umgca wokunqanda.