1. Yeyiphi imiba ekufuneka ibhodi yesekethe iDEBUG iqale kuyo?

Ngokubhekiselele kwiisekethe zedijithali, qala ngokumisela izinto ezintathu ngokulandelelana kwazo:

1) Qinisekisa ukuba onke amaxabiso amandla ayahlangabezana neemfuno zoyilo. Ezinye iisistim ezinobonelelo lwamandla amaninzi zinokufuna iinkcukacha ezithile zocwangco kunye nesantya sobonelelo lwamandla.

2) Qinisekisa ukuba zonke iifrikhwensi zesignali yewotshi zisebenza ngokufanelekileyo kwaye akukho zingxaki zingeyo-monotonic kwimida yesignali.

3) Qinisekisa ukuba isignali yokusetha kwakhona ihlangabezana neemfuno zokucaciswa.

Ukuba ezi ziqhelekileyo, i-chip kufuneka ithumele umjikelo wokuqala (umjikelo) umqondiso. Okulandelayo, debug ngokomgaqo wokusebenza kwenkqubo kunye neprotocol yebhasi.

2. Kwimeko yobungakanani bebhodi yesekethe esisigxina, ukuba imisebenzi engaphezulu kufuneka ifakwe kuyilo, kudla ngokuba yimfuneko ukuba kwandiswe ukuxinana komkhondo wePCB, kodwa oku kunokunyusa ukungenelela okuhambelanayo kweempawu, kwaye kwangaxeshanye. , umkhondo ubhityile kakhulu kwaye i-impedance Ayinakuncitshiswa, nceda ungenise izakhono kwi-high-speed (> 100MHz) yoyilo lwePCB ephezulu?

Xa uyila i-PCB enesantya esiphezulu kunye noxinaniso oluphezulu, ukuphazamiseka kwe-crosstalk (ukuphazamiseka kwe-crosstalk) kufuna ingqwalasela ekhethekileyo, kuba inempembelelo enkulu kwixesha kunye nokunyaniseka komqondiso. Nazi iingongoma ezimbalwa ekufuneka uziqaphele:

1) Lawula ukuqhubela phambili kunye nokuhambelana kwe-impedance yempawu ye-wiring.

Ubungakanani besithuba somkhondo. Ngokuqhelekileyo kubonakala ukuba isithuba siphinda kabini ububanzi bomgca. Kuyenzeka ukwazi impembelelo yokulandela umkhondo kwisithuba sexesha kunye nemfezeko yomqondiso ngokulinganisa, kwaye ufumane ubuncinci besithuba esinyamezelekayo. Isiphumo seempawu ezahlukeneyo zetshiphu zinokwahluka.

2) Khetha indlela efanelekileyo yokuphelisa.

Gwema iileya ezimbini ezijongeneyo kunye nolwalathiso olufanayo lwe-wiring, nokuba kukho iingcingo ezidibanayo, kuba olu hlobo lwe-crosstalk lukhulu kunelo lwe-wiring olusondeleyo kuluhlu olufanayo.

Sebenzisa iindlela ezingaboniyo/ezingcwatywayo ukwandisa indawo yokulandela umkhondo. Kodwa iindleko zemveliso yebhodi yePCB ziya kwanda. Kunzima ngokwenene ukufezekisa ukuhambelana okupheleleyo kunye nobude obulinganayo ekuphunyezweni okuyinyani, kodwa kuseyimfuneko ukwenza njalo.

Ukongeza, ukupheliswa kokwahluka kunye nokupheliswa kwemowudi eqhelekileyo kunokugcinwa ukunciphisa impembelelo kwixesha kunye nokuthembeka komqondiso.

3. Ukucoca kumbane we-analog kaninzi kusebenzisa isekethe yeLC. Kodwa kutheni umphumo wokucoca weLC ubi kakhulu kuneRC ngamanye amaxesha?

Ukuthelekiswa kwe-LC kunye ne-RC yokucoca imiphumo kufuneka kuthathelwe ingqalelo ukuba ngaba i-frequency band iya kuhluzwa kwaye ukhetho lwe-inductance lufanelekile. Ngenxa yokuba i-inductance ye-inductor (i-reactance) ihambelana nexabiso le-inductance kunye nokuphindaphinda. Ukuba i-frequency yengxolo yonikezelo lwamandla iphantsi, kwaye ixabiso le-inductance alikho likhulu ngokwaneleyo, umphumo wokucoca unokungabi kuhle njenge-RC.

Nangona kunjalo, iindleko zokusebenzisa i-RC yokuhluza kukuba i-resistor ngokwayo idla amandla kwaye inokusebenza kakuhle, kwaye ubeke ingqalelo kumandla anokuthi axhathise i-resistor ekhethiweyo.