Bakeng sa ho netefatsa boleng ba phetisetso ea matšoao, fokotsa tšitiso ea EMI, le ho fetisa setifikeiti sa tlhahlobo ea impedance e nepahetseng, PCB ho hlokahala moralo o tšoanang oa lets’oao la senotlolo. Tataiso ena ea moralo e ipapisitse le li-parameter tse tloaelehileng tsa lipalo, litšoaneleho tsa lets’oao la sehlahisoa sa TV, litlhoko tsa PCB Layout, palo ea software ea SI9000, tlhaiso-leseling ea maikutlo a mofani oa PCB joalo-joalo, ‘me qetellong e fihle ho moralo o khothaletsoang. E loketse maemo a tšebetso a barekisi ba PCB ba bangata le meralo ea boto ea PCB e nang le litlhoko tsa taolo ea impedance.

E ‘ngoe. Moralo oa li-impedans tse peli

① Moralo oa fatše: bophara ba mohala, sebaka sa 7/5/7mil bophara ba terata ea fatše ≥20mil lets’oao le sebaka sa terata ea fatše 6mil, lesoba le leng le le leng la 400mil; (2) Moqapi o sa koaheleng: bophara ba mohala, sebaka sa 10/5/10mil phapano ea para le sebaka se pakeng tsa para ≥20mil (maemo a khethehileng a ke ke a ba ka tlase ho 10mil) ho khothaletsoa hore sehlopha sohle sa mohala oa lets’oao o fapaneng o sebelisa enveloping. ho sireletsa, lets’oao le fapaneng le sebaka sa ho sireletsa fatše ≥35mil (maemo a khethehileng a ke ke a ba ka tlase ho 20mil). 90 ohm differential impedance e khothalletsoang moralo

Bophara ba mohala, sebaka sa 10/5/10mil bophara ba terata e fatše ≥20mil Pontšo le sebaka sa terata sa fatše sa 6mil kapa 5mil, lesoba la fatše le leng le le leng la 400mil; ②Se kenyelletse moetso:

Bophara ba mela le sebaka sa 16/5/16mil sebaka se pakeng tsa mehala ea matšoao a fapaneng ≥20mil ho khothaletsoa hore sekoaelo sa fatše se sebelisoe bakeng sa sehlopha sohle sa likhoele tsa matšoao a fapaneng. Sebaka pakeng tsa letšoao la phapang le mohala oa fatše o sirelelitsoeng e tlameha ho ba ≥35mil (kapa ≥20mil maemong a khethehileng). Lintlha tse ka sehloohong: fana ka pele ho tšebeliso ea moralo oa fatše o koahetsoeng, mohala o khutšoanyane le sefofane se feletseng se ka sebelisoa ntle le moralo o koahetsoeng oa fatše; Palo methati: Plate FR-4, poleiti botenya 1.6mm+/-10%, poleiti dielectric kamehla 4.4+/-0.2, koporo botenya 1.0 oz (1.4mil) solder oli botenya 0.6±0.2mil, dielectric kamehla 3.5+/-0.3.

Moralo oa impedance oa mekhahlelo e ‘meli le e mene

100 ohm differential impedance e khothalelitsoe bophara ba mohala le sebaka sa 5/7/5mil sebaka se pakeng tsa lipara ≥14mil(3W criterion) hlokomela: ho khothaletsoa hore sekoaelo sa fatše se sebelisoe bakeng sa sehlopha sohle sa likhoele tsa matšoao a fapaneng. Sebaka se pakeng tsa lets’oao la phapang le thapo ea fatše e sireletsang e lokela ho ba bonyane 35mil (eseng ka tlase ho 20mil maemong a khethehileng). 90ohm differential impedance E khothalelitsoe bophara ba mohala le sebaka 6/6/6mil Bohole ba para e fapaneng ≥12mil(3W criterion) Lintlha tsa bohlokoa: Tabeng ea thapo e telele e fapaneng, ho khothaletsoa hore sebaka se pakeng tsa mahlakore a mabeli a mothapo o fapaneng oa USB. phuthela fatše ka 6mil ho fokotsa kotsi ea EMI (phuthela fatše ‘me u se ke ua phuthela fatše, bophara ba mela le tekanyo ea sebaka sa mela e lumellana). Liparamente tsa lipalo: Fr-4, poleiti botenya 1.6mm+/-10%, poleiti dielectric kamehla 4.4+/-0.2, Koporo botenya 1.0oz (1.4mil) seka-folisoa lakane (PP) 2116 (4.0-5.0mil), dielectric kamehla 4.3+/ -0.2 botenya ba oli ea solder 0.6±0.2mil, Dielectric kamehla 3.5+/-0.3 laminated sebopeho: skrine printing layer solder layer copper layer semi-cured film coated copper substrate semi-cured film copper layer solder layer printing layer

Boraro. Moralo oa XNUMX layer board impedance

Sebopeho sa lamination se nang le likarolo tse tšeletseng se fapane bakeng sa liketsahalo tse fapaneng. Tataiso ena e khothaletsa feela moralo oa lamination e tloaelehileng haholo (sheba FIG. 2), ‘me meralo e latelang e khothalelitsoeng e thehiloe ho data e fumanoeng tlasa lamination ho FIG. 2. Moqapi oa impedance oa lera le ka ntle o tšoana le oa boto ea mekato e mene. Hobane lera le ka hare ka kakaretso le na le likarolo tse ngata tsa sefofane ho feta bokaholimo, tikoloho ea motlakase ea motlakase e fapane le bokaholimo. Lintlha tse latelang ke litlhahiso tsa taolo ea impedance ea lera la boraro la wiring (referense ea laminated Figure 4). 90 ohm differential impedance Re khothaletsoa bophara ba mola oa moralo, sebaka sa mohala 8/10/8mil Difference para distance ≥20mil(3W criterion); Liparamente tsa lipalo: Fr-4, poleiti botenya 1.6mm+/-10%, poleiti dielectric kamehla 4.4+/-0.2, Koporo botenya 1.0oz (1.4mil) seka-folisoa lakane (PP) 2116 (4.0-5.0mil), dielectric kamehla 4.3+/ -0.2 botenya ba oli ea solder 0.6±0.2mil, Dielectric kamehla 3.5+/- 0.3 laminated sebopeho: top screen blocking layer koporo semi-cured copper-coated substrate semi-coated copper-coated substrate semi-coated copper-coated layer layer blocking

Bakeng sa likarolo tse fetang tse ‘ne kapa tse tšeletseng, ka kopo iqapetse u le mong ho latela melao e amehang kapa u buisane le basebetsi ba amehang ho tseba sebopeho sa lamination le sekema sa wiring.

5. Haeba ho na le litlhokahalo tse ling tsa taolo ea impedance ka lebaka la maemo a ikhethileng, ka kopo ipalle u le mong kapa u buisane le basebetsi ba amehang ho fumana moralo oa moralo.

Tlhokomeliso: ① Ho na le linyeoe tse ngata tse amang boipelaetso. Haeba PCB e hloka ho laoloa ke impedance, litlhoko tsa taolo ea impedance li lokela ho tšoauoa ka ho hlaka ho data ea moralo oa PCB kapa lakane ea sampole; (2) 100 ohm impedance e fapaneng e sebelisoa haholo-holo bakeng sa matšoao a HDMI le LVDS, moo HDMI e hlokang ho fetisa setifikeiti se nepahetseng ke tlamo; ③ 90 ohm impedance e fapaneng e sebelisoa haholo bakeng sa lets’oao la USB; (4) Single-terminal 50 ohm impedance e sebelisoa haholo bakeng sa karolo ea lets’oao la DDR. Kaha boholo ba likaroloana tsa DDR li amohela moralo o ts’oanang oa phetoho ea ka hare, moralo o thehiloe ho boto ea Demo e fanoeng ke k’hamphani ea tharollo e le sesupo, ‘me tataiso ena ea moralo ha e khothalletsoe. ⑤, impedance e le ‘ngoe ea 75-ohm e sebelisoa haholo bakeng sa ho kenya le ho hlahisa video ea analog. Ho na le khanyetso ea 75-ohm e ts’oanang le khanyetso ea mobu holim’a moralo oa potoloho, ka hona ha ho hlokahale ho etsa moralo o ts’oanang oa ho ts’oana ka har’a PCB Layout, empa ho lokela ho hlokomeloa hore khanyetso ea 75-ohm moleng e lokela ho behoa haufi. ho phini ea terminal. PP e sebelisoang hangata.