Nekuvandudzwa kwezvigadzirwa zvevatengi, zvishoma nezvishoma inokura yakananga kugwara rehungwaru, saka izvo zvinodiwa zvePCB board impedance zviri kuramba zvichiwedzera kuomarara, izvo zvinosimudzirawo kuenderera mberi kwekukura kweiyo impedance dhizaini tekinoroji.
Chii chinonzi impedance?
1. Kurwisana kunokonzerwa nekushandura ikozvino muzvikamu kune chokuita ne capacitance uye inductance.Kana paine yemagetsi chiratidzo waveform transmission mune conductor, kushorwa kwainogamuchira kunonzi impedance.
2. Kupikisa ndiko kupikisa kunokonzerwa neakananga ikozvino pane zvikamu, izvo zvinoenderana nemagetsi, resistivity, uye ikozvino.
Kushandiswa kwemaitiro impedance
1. Inoshandiswa kune-high-speed signal transmission uye high-frequency circuit, kushandiswa kwemagetsi kunopiwa nebhodhi rakadhindwa kunofanira kukwanisa kudzivirira kufungidzira panguva yekufambisa kwechiratidzo, kuchengetedza chiratidzo, kuderedza kurasikirwa kwekutapurirana, uye kuita basa rinoenderana.Yakazara, yakavimbika, yakarurama, isina-kunetseka, uye isina ruzha-isina kutapurirana kwemasaini.
2. Saizi ye impedance haigone kunzwisiswa seyakakura zviri nani kana diki zviri nani, kiyi inofananidzira.
Dzora zvimiro zvehunhu impedance
Iyo dielectric isingachinji yepepa, ukobvu hweiyo dielectric layer, upamhi hwemutsara, ukobvu hwemhangura, uye ukobvu hwemasolder mask.
Kufurira uye kutonga kwe solder mask
1. Ukobvu hwe solder mask hune zvishoma zvishoma pane impedance.Ukobvu hwemasolder mask hunowedzera ne10um, uye iyo impedance kukosha inochinja chete 1-2 ohms.
2. Muchigadziro, pane musiyano mukuru pakati pechisarudzo chekuvhara uye pasina chivharo che solder mask, imwe-yakapera 2-3 ohms, uye kusiyana 8-10 ohms.
3. Mukugadzirwa kwemabhodhi eimpedance, ukobvu hwemasolder mask hunowanzo kudzorwa zvinoenderana nezvinodiwa zvekugadzira.
Impedance test
Iyo yakakosha nzira ndeye TDR nzira (Nguva Domain Reflectometry).Nheyo yakakosha ndeyokuti chiridzwa chinoburitsa chiratidzo chepulse, icho chinopetwa kumashure kuburikidza nechikamu chekuyedza chebhodhi redunhu kuyera shanduko yehuhu impedance yekubuda uye yakapetwa kumashure.Mushure mekunge komputa yaongorora iyo hunhu impedance, inobuda hunhu impedance inobuda.
Impedance kugadzirisa dambudziko
1. Nezvekudzora parameters ye impedance, zvinodiwa zvekutonga zvinogona kuwanikwa kuburikidza nekugadzirisa kuwirirana mukugadzira.
2. Mushure mekugadzirisa mukugadzirwa, bhodhi rinochekwa uye rinoongororwa.Kana hupamhi hwepakati hwakaderedzwa, upamhi hwemutsara hunogona kuderedzwa kuti huenderane nezvinodiwa;kana ukobvu hwakanyanya gobvu, mhangura inogona kukwizwa kuti ideredze iyo impedance kukosha.
3. Mukuedza, kana pane misiyano yakawanda pakati pedzidziso uye chokwadi, mukana mukuru ndewekuti pane dambudziko nekugadzirwa kweinjiniya uye test strip design.
Nguva yekutumira: Nov-19-2021