Mekhoa ea taolo ea Impedans ho li-PCB tse tenyetsehang

Ka poso ena ea blog, re tla kenella lefats'eng la li-PCB tse tenyetsehang le ho hlahloba mekhoa e fapaneng e sebelisoang ho netefatsa taolo e nepahetseng ea impedance.

tsebisa:

Taolo ea impedance ke karolo ea bohlokoa ea ho rala le ho etsa liboto tsa potoloho tse hatisitsoeng (Flex PCBs). Ha liboto tsena li ntse li tsebahala haholo liindastering tse ngata, hoa hlokahala ho utloisisa mekhoa e fapaneng ea taolo ea impedance e teng.

PCB e tenyetsehang ke eng?

Flexible PCB, eo hape e tsejoang e le potoloho e hatisitsoeng e feto-fetohang kapa sesebelisoa sa elektroniki se tenyetsehang, e bua ka potoloho ea elektroniki e tšesaane, e bobebe ebile e tenyetseha haholo. Ho fapana le li-PCB tse thata, tse entsoeng ka lisebelisoa tse thata tse kang fiberglass, li-PCB tse tenyetsehang li etsoa ka lisebelisoa tse tenyetsehang joalo ka polyimide. Ho tenyetseha hona ho li lumella hore li kobehe, li sothe le ho lekana ho lekana sebopeho kapa sebopeho sefe kapa sefe.

Hobaneng ha taolo ea impedance e le bohlokoa ho li-PCB tse tenyetsehang?

Taolo ea impedance e bohlokoa ho li-PCB tse feto-fetohang kaha e netefatsa botšepehi ba matšoao, e fokotsa tahlehelo ea matšoao, 'me e ntlafatsa ts'ebetso ka kakaretso. Ha tlhoko ea lits'ebetso tsa maqhubu a phahameng joalo ka li-smartphones, matlapa, lintho tse ka roaloang le lisebelisoa tsa elektroniki tsa likoloi e ntse e eketseha, ho boloka taolo ea impedance ho ba bohlokoa le ho feta.

Mokhoa oa ho laola tšitiso ea PCB e feto-fetohang:

1. Jiometry ea potoloho:
Circuit geometry e bapala karolo ea bohlokoa taolong ea impedance. Impedance e ka hlophisoa hantle ka ho fetola bophara ba trace, sebaka le boima ba koporo. Lipalo tse nepahetseng le lipapiso li thusa ho fihlela boleng bo lakatsehang ba impedance.

2. Lisebelisoa tsa dielectric tse laoloang:
Khetho ea thepa ea dielectric e ama haholo taolo ea impedance. Li-PCB tse feto-fetohang ka lebelo le phahameng hangata li sebelisa lisebelisoa tse tlase-dielectric-kamehla ho fokotsa lebelo la phatlalatso ea mats'oao ho fihlela ts'ebetso e laoloang.

3. Litlhophiso tsa Microstrip le stripline:
Litlhophiso tsa Microstrip le stripline li sebelisoa haholo bakeng sa taolo ea impedance ea li-PCB tse tenyetsehang. Microstrip e bolela tlhophiso eo ho eona ho behoang mesaletsa ea conductive ka holim'a thepa ea dielectric, athe stripline e kenyelletsa mesaletsa ea sandwich pakeng tsa likarolo tse peli tsa dielectric. Litlhophiso ka bobeli li fana ka litšobotsi tse ka lebelloang tsa impedance.

4. Capacitor e kentsoeng:
Li-capacitor tse kentsoeng li boetse li sebelisoa ho fana ka boleng bo phahameng ba bokhoni ha o ntse o laola impedance. Ho sebelisa lisebelisoa tsa capacitive tse kentsoeng joalo ka lifilimi ho thusa ho boloka ho ts'oana ha impedance ho pholletsa le PCB e tenyetsehang.

5. Ho kopanya ho fapaneng:
Letšoao le fapaneng le sebelisoa hangata puisanong e potlakileng mme e hloka taolo e nepahetseng ea impedance. Ka ho hokahanya mesaletsa e fapaneng ka nepo le ho boloka sebaka se sa fetoheng, impedance e ka laoloa ka thata, ea fokotsa lipontšo tsa matšoao le crosstalk.

6. Mokhoa oa teko:
Taolo ea impedance e hloka tlhahlobo e matla le netefatso ho netefatsa hore ho latela litlhaloso tsa moralo. Mahlale a joalo ka TDR (Time Domain Reflectometry) le liteko tsa impedance li sebelisoa ho lekanya le ho netefatsa boleng ba impedance ka maqhubu a fapaneng.

ha re phethela:

Taolo ea impedance ke karolo ea bohlokoa ea ho rala li-PCB tse tenyetsehang ho fihlela litlhoko tsa lits'ebetso tsa sejoale-joale tsa elektroniki. Baenjineri ba ka fihlela taolo e nepahetseng ka ho sebelisa jiometri e nepahetseng ea potoloho, lisebelisoa tse laoloang tsa dielectric, meralo e ikhethileng joalo ka microstrip le stripline, le mekhoa e joalo ka bokhoni bo kentsoeng le ho kopanya ka ho fapana. Teko e phethahetseng le netefatso li bapala karolo ea bohlokoa ho netefatsa ho nepahala le ts'ebetso ea impedance. Ka ho utloisisa mekhoa ena ea taolo ea impedance, baqapi le bahlahisi ba ka fana ka li-PCB tse ka tšeptjoang le tse phahameng tsa ts'ebetso bakeng sa liindasteri tse fapaneng.