Samfurin allon pcb mai gefe biyu FR4 TG140 impedance sarrafawa PCB
Ƙayyadaddun samfur:
| Tushen Material: | Saukewa: FR4TG140 |
| Kauri PCB: | 1.6 +/- 10% mm |
| Ƙididdigar Layer: | 2L |
| Kaurin Copper: | 1/1 oz |
| Maganin saman: | HASL-LF |
| Mashin solder: | Koren mai sheki |
| Silkscreen: | Fari |
| Tsari na musamman: | Daidaitawa |
Aikace-aikace
Allolin kewayawa tare da impedance mai sarrafawa suna da halaye masu zuwa:
1. Tsaya sarrafa tsarin masana'anta na allon kewayawa, gami da zaɓin kayan abu, firinta da aka buga, tazarar Layer, da sauransu, don tabbatar da kwanciyar hankali na kewaye;
2. Yi amfani da takamaiman kayan aikin ƙirar PCB don tabbatar da cewa impedance ya dace da buƙatun ƙira;
3. A cikin tsarin PCB gabaɗaya da kewayawa, yi amfani da mafi guntu hanya kuma rage lanƙwasawa don tabbatar da kwanciyar hankali na impedance;
4. Rage raguwa tsakanin layin sigina da layin wutar lantarki da layin ƙasa, da rage tsangwama da tsangwama na layin siginar;
5. Yi amfani da fasahar impedance mai dacewa akan layin watsa sigina mai sauri don tabbatar da tsabta da kwanciyar hankali na siginar;
6. Yi amfani da fasahar haɗin haɗin gwiwa don rage hayaniyar haɗuwa da radiation na lantarki;
7. Bisa ga daban-daban impedance bukatun, zaži dace Layer kauri, line nisa, line tazara da dielectric akai;
8. Yi amfani da ƙayyadaddun kayan gwaji don yin gwajin gwaji a kan allon kewayawa don tabbatar da cewa ma'auni na impedance ya dace da bukatun ƙira.
Me yasa kulawar impedance na al'ada zai iya zama karkacewa 10% kawai?
Abokai da yawa suna fatan gaske cewa za a iya sarrafa impedance zuwa 5%, kuma na ma ji game da 2.5% impedance bukata. A gaskiya ma, tsarin kula da impedance shine 10% sabawa, dan kadan mafi tsanani, zai iya cimma 8%, akwai dalilai da yawa:
1, karkacewar kayan farantin kanta
2. Etching sabawa a lokacin PCB aiki
3. The iation na kwarara kudi lalacewa ta hanyar lamination a lokacin PCB aiki
4. A babban gudun, da surface roughage na jan karfe tsare, PP gilashin fiber sakamako, da kuma DF mita bambancin sakamako na kafofin watsa labarai dole ne su fahimci impedance.
Ina ake amfani da allunan kewayawa tare da buƙatun impedance gabaɗaya?
Ana amfani da allunan kewayawa tare da buƙatun impedance don watsa sigina mai sauri, kamar watsa siginar dijital mai sauri, watsa siginar mitar rediyo da watsa siginar kalaman millimeter. Wannan shi ne saboda rashin ƙarfi na allon kewayawa yana da alaƙa da saurin watsawa da kwanciyar hankali na siginar. Idan ƙirar impedance ba ta da ma'ana, zai shafi ingancin watsa siginar har ma ya haifar da asarar sigina. Don haka, a lokutan da ke buƙatar ingancin watsa sigina mai girma, yawanci ya zama dole a yi amfani da allunan kewayawa tare da buƙatun impedance.
FAQs
Impedance yana auna adawar da'irar lantarki lokacin da ake amfani da madaidaicin halin yanzu akansa. Yana da haɗin ƙarfin ƙarfin ƙarfi da shigar da wutar lantarki a babban mita. Ana auna impedance a cikin Ohms, kama da juriya.
Wasu ƴan abubuwan da suka shafi sarrafa impedance yayin ƙirar PCB sun haɗa da faɗin alama, kaurin jan ƙarfe, kaurin dielectric da madaidaicin dielectric.
1) Er ɗin ya yi daidai da ƙimar impedance
2) Kauri dielectric yayi daidai da ƙimar impedance
3) Faɗin layin yana da inversely gwargwado zuwa ƙimar impedance
4) Tagulla kauri ne inversely gwargwado ga impedance darajar
5) Tazarar layukan daidai yake da ƙimar impedance (bambance-bambancen impedance)
6) The solder juriya kauri ne inversely gwargwado ga impedance darajar
A cikin manyan aikace-aikacen mitar da suka dace da impedance na alamun PCB yana da mahimmanci a kiyaye amincin bayanai da tsabtar sigina. Idan maƙasudin alamar PCB mai haɗa abubuwa biyu bai dace da ƙayyadaddun halayen abubuwan da aka haɗa ba, za a iya ƙara lokutan sauyawa a cikin na'urar ko kewaye.
Gudanar da ya ƙare, rashin daidaituwa, banbanci, rashin daidaituwa da fadada tsinkaye
