Impedance yekudzora nzira mune inoshanduka PCBs

Mune ino blog positi, isu tichapinda munyika yePCB inoshanduka uye tiongorore nzira dzakasiyana dzinoshandiswa kuve nechokwadi chekutonga kwe impedance.

suma:

Impedance control chinhu chakakosha chekugadzira uye kugadzira inoshanduka yakadhindwa edunhu mabhodhi (Flex PCBs). Sezvo mabhodhi aya achiwedzera mukurumbira mumaindasitiri mazhinji, zvinove zvakakosha kuti unzwisise nzira dzakasiyana dzekudzora impedance dziripo.

Chii chinonzi flexible PCB?

Flexible PCB, inozivikanwawo se flexible printed circuit kana flexible electronic device, inoreva dunhu remagetsi rakatetepa, rakareruka uye rinonyatso shanduka. Kusiyana nemaPCB akaomarara, anogadzirwa achishandisa zvinhu zvakasimba senge fiberglass, maPCB anochinjika anogadzirwa achishandisa zvinhu zvinochinjika senge polyimide. Uku kuchinjika kunovabvumira kukotama, kumonyoroka uye contour kuti ikwane chero chimiro kana fomu.

Nei impedance control yakakosha mumaPCB anochinjika?

Impedance control yakakosha mumaPCB anochinjika sezvo ichivimbisa kutendeseka kwechiratidzo, inoderedza kurasikirwa kwechiratidzo, uye inovandudza kuita kwese. Sezvo kudiwa kweakakwira-frequency application senge ma smartphones, mahwendefa, zvinopfekeka, uye mota dzemagetsi zvichiramba zvichiwedzera, kuchengetedza impedance control inotonyanya kukosha.

Impedance yekudzora nzira yeinochinjika PCB:

1. Circuit geometry:
Circuit geometry inoita basa rakakosha mukudzora impedance. Impedance inogona kugadziridzwa zvakanaka nekugadzirisa trace wide, spacing uye huremu hwemhangura. Maverengero akakodzera uye simulations anobatsira kuzadzisa inodiwa impedance kukosha.

2. Inodzorwa dielectric zvinhu:
Sarudzo ye dielectric zvinhu inokanganisa zvakanyanya impedance control. High-speed inoshanduka maPCBs anowanzo shandisa yakaderera-dielectric-nguva dzose zvinhu kuderedza chiratidzo chekuparadzira kumhanya kuti uwane inodzorwa impedance.

3. Microstrip uye stripline masisitimu:
Microstrip uye stripline masisitimu anoshandiswa zvakanyanya kune impedance kutonga kweanochinjika maPCB. Microstrip inoreva gadziriso umo conductive traces inoiswa pamusoro pepamusoro pechinhu che dielectric, nepo stripline inosanganisira sandwiching conductive traces pakati pematanho maviri edielectric. Magadzirirwo ese ari maviri anopa anofungidzira impedance maitiro.

4. Yakaiswa capacitor:
Akamisikidzwa capacitors anoshandiswawo kupa yakakwira capacitance kukosha uku uchidzora impedance. Kushandisa yakamisikidzwa capacitive zvinhu zvakaita semafirimu kunobatsira kuchengetedza impedance kufanana mukati mePCB inoshanduka.

5. Differential pairing:
Kuratidzira kwakasiyana kunowanzoshandiswa mukukurumidzira kutaurirana uye kunoda chaiyo impedance control. Nekunyatso pairing misiyano yekuteedzera uye kuchengetedza inopindirana nzvimbo, impedance inogona kudzorwa zvakasimba, kuderedza zviratidzo zvechiratidzo uye crosstalk.

6. Nzira yekuedza:
Impedance control inoda kuomesesa kuyedzwa uye kuongororwa kuti ive nechokwadi chekutevedzera dhizaini yakatarwa. Matekinoroji akadai seTDR (Nguva Domain Reflectometry) uye impedance testers anoshandiswa kuyera nekuona impedance kukosha pane akasiyana ma frequency.

mukupedzisa:

Impedance control chinhu chakakosha chekugadzira maPCB anochinjika kuti asangane nezvinodiwa zvemazuva ano emagetsi maapplication. Mainjiniya anogona kuwana yakakwana impedance kudzora nekushandisa yakakodzera dunhu geometry, inodzorwa dielectric zvinhu, zvakati gadziriso senge microstrip uye stripline, uye matekiniki akadai seakamisikidzwa capacitance uye musiyano pairing. Kunyatsoyedzwa uye kusimbiswa kunoita basa rakakosha mukuita kuti impedance ikodzere uye kuita. Nekunzwisisa idzi impedance control nzira, vagadziri uye vagadziri vanogona kupa yakavimbika uye yepamusoro-inoshanda inoshanduka PCBs kune akasiyana maindasitiri.