Ngokuphuculwa kweemveliso zabathengi, ngokuthe ngcembe ikhula isiya kwicala lobukrelekrele, ngoko ke iimfuno ze-PCB ibhodi yokungaphumeleli ziya ziba ngqongqo ngakumbi, nto leyo ekhuthaza ukukhula okuqhubekayo koyilo lwetekhnoloji ye-impedance.
Yintoni impedance yophawu?
1. Ukuxhatshazwa okwenziwa ngokutshintshana ngoku kumacandelo kuhambelana ne-capacitance kunye ne-inductance.Xa kukho i-electronic signal waveform transmission kwi-conductor, ukuchasana okufumanayo kubizwa ngokuba yi-impedance.
2. Ukuchasana kukuxhathisa okwenziwa ngoku ngokuthe ngqo kumacandelo, ahambelana ne-voltage, resistivity, kunye ne-current.
Ukusetyenziswa kwe-impedance yeempawu
1. Ukusetyenziswa kwi-high-speed signal transmission kunye ne-high-frequency circuit, ukusebenza kombane okunikezelwa yibhodi eprintiweyo kufuneka kukwazi ukukhusela ukubonakalisa ngexesha lokuhambisa umqondiso, ukugcina umqondiso, ukunciphisa ukulahleka kokudluliselwa, kunye nokudlala indima ehambelanayo.Ugqithiso olupheleleyo, oluthembekileyo, oluchanekileyo, olungenaxhala, kunye nokuhanjiswa kwemiqondiso engenangxolo.
2. Ubungakanani be-impedance abunakuqondwa ngokulula njengoko inkulu ingcono okanye incinci ingcono, isitshixo siyahambelana.
Lawula iiparamitha ze-impedance yeempawu
I-dielectric constant yeshiti, ubukhulu bomaleko we-dielectric, ububanzi bomgca, ukutyeba kobhedu, kunye nobukhulu bemaski ye-solder.
Impembelelo kunye nokulawula imaski ye-solder
1. Ubunzima bemaski ye-solder bunempembelelo encinci kwi-impedance.Ubunzima bemaski ye-solder buyanda nge-10um, kwaye ixabiso le-impedance litshintsha kuphela i-1-2 ohms.
2. Kuyilo, kukho umahluko omkhulu phakathi kokukhethwa kwekhava kwaye akukho imaski ye-solder yekhava, i-single-end 2-3 ohms, kunye nokwahlukana kwe-8-10 ohms.
3. Kwimveliso yeebhodi ze-impedance, ubukhulu bemaski ye-solder bulawulwa ngokuqhelekileyo ngokweemfuno zokuvelisa.
Uvavanyo lwe-impedance
Indlela esisiseko yindlela ye-TDR (i-Time Domain Reflectometry).Umgaqo osisiseko kukuba isixhobo sikhupha isignali ye-pulse, egotywayo emva kovavanyo lwebhodi yesekethe ukulinganisa utshintsho kwi-impedance yeempawu zokukhutshwa kunye nomqolo osongelweyo.Emva kokuba ikhomputha ihlalutye i-impedance yeempawu, i-impedance ye-output impedance iyaphuma.
Impedance yokusingatha ingxaki
1. Ngokumalunga nemilinganiselo yokulawula i-impedance, iimfuno zokulawula zinokufezekiswa ngokuhlengahlengiswa ngokubambisana kwimveliso.
2. Emva kwe-lamination kwimveliso, ibhodi iyasikwa kwaye ihlalutywe.Ukuba ubukhulu bendawo buncitshisiwe, ububanzi bomgca bunokuncitshiswa ukuhlangabezana neemfuno;ukuba ubukhulu bukhulu kakhulu, ubhedu lunokunyuswa ukunciphisa ixabiso le-impedance.
3. Kuvavanyo, ukuba kukho umahluko omkhulu phakathi kwethiyori kunye nenyani, eyona nto inokwenzeka kukuba kukho ingxaki kuyilo lobunjineli kunye noyilo lwe-test strip.
Ixesha lokuposa: Nov-19-2021