1. Yiziphi izici okufanele ibhodi lesekethe i-DEBUG iqale kuzo?

Ngokuqondene namasekhethi edijithali, qala ngokunquma izinto ezintathu ngokulandelana kwazo:

1) Qinisekisa ukuthi wonke amanani amandla ahlangabezana nezidingo zokuklama. Amanye amasistimu anezinto eziningi zamandla angase adinge ukucaciswa okuthile kokuhleleka kanye nesivinini samandla kagesi.

2) Qinisekisa ukuthi wonke amaza wesignali wewashi asebenza kahle futhi azikho izinkinga ezingezona eze-monotonic emaphethelweni esignali.

3) Qinisekisa ukuthi isignali yokusetha kabusha iyahlangabezana yini nezimfuneko zokucaciswa.

Uma lokhu kujwayelekile, i-chip kufanele ithumele isignali yomjikelezo wokuqala (umjikelezo). Okulandelayo, lungisa iphutha ngokuya ngesimiso sokusebenza sohlelo kanye nephrothokholi yebhasi.

2. Endabeni yosayizi webhodi lesifunda ongaguquki, uma imisebenzi eyengeziwe idinga ukufakwa ekwakhiweni, ngokuvamile kuyadingeka ukwandisa ukuminyana kwe-PCB trace, kodwa lokhu kungase kwandise ukuphazamiseka okuhambisanayo kokulandela umkhondo, futhi ngesikhathi esifanayo. , imikhondo mincane kakhulu futhi i-impedance ayikwazi ukuncishiswa, sicela wethule amakhono edizayini ye-PCB enesivinini esikhulu (>100MHz)?

Uma udizayina ama-PCB anesivinini esikhulu nanokuminyana okuphezulu, ukuphazamiseka kwe-crosstalk (ukuphazamiseka kwe-crosstalk) kudinga ukunakwa okukhethekile, ngoba kunomthelela omkhulu kusikhathi nobuqotho besignali. Nawa amaphuzu ambalwa okufanele uwaqaphele:

1) Lawula ukuqhubeka nokumataniswa kwesici se-impedance ye-wiring.

Usayizi wesikhala sokulandelela. Ngokuvamile kubonakala ukuthi isikhala siphindwe kabili kunobubanzi bomugqa. Kuyenzeka ukwazi umthelela wesikhala sokulandelela ngesikhathi nobuqotho besignali ngokulingisa, nokuthola isikhala esincane esibekezeleleka. Umphumela wamasignali e-chip ahlukene ungase uhluke.

2) Khetha indlela efanele yokuqeda.

Gwema izendlalelo ezimbili ezincikene ezinesiqondiso esifanayo sezintambo, ngisho noma kunezintambo ezidlulanayo, ngoba lolu hlobo lwe-crosstalk lukhulu kunalolo lwezintambo eziseduze kungqimba olufanayo.

Sebenzisa izimbobo ezingaboni/ezingcwatshiwe ukuze wandise indawo yokulandela umkhondo. Kodwa izindleko zokukhiqiza zebhodi le-PCB zizokhula. Kunzima ngempela ukuzuza ukufana okuphelele nobude obulinganayo ekusetshenzisweni kwangempela, kodwa kusadingeka ukwenza kanjalo.

Ngaphezu kwalokho, ukunqanyulwa okuhlukile kanye nokunqanyulwa kwemodi evamile kungagodlwa ukuze kuncishiswe umthelela kusikhathi nobuqotho besignali.

3. Ukuhlunga kugesi we-analog kuvame ukusebenzisa isekethe ye-LC. Kodwa kungani umphumela wokuhlunga we-LC mubi kune-RC ngezinye izikhathi?

Ukuqhathaniswa kwemiphumela yokuhlunga ye-LC kanye ne-RC kufanele kucabangele ukuthi ibhande lemvamisa okufanele lihlungwe kanye nokukhetha kwe-inductance kufanelekile. Ngoba inductance ye-inductor (ukusabela) ihlobene nevelu ye-inductance kanye nemvamisa. Uma imvamisa yomsindo wokunikezwa kwamandla iphansi, futhi nevelu ye-inductance ingenkulu ngokwanele, umphumela wokuhlunga ungase ungabi muhle njenge-RC.

Kodwa-ke, izindleko zokusebenzisa ukuhlunga kwe-RC ukuthi i-resistor ngokwayo idla amandla futhi ingasebenzi kahle, futhi inake amandla i-resistor ekhethiwe engakwazi ukumelana nayo.