Take the Bluetooth speaker as an example to integrate the basic knowledge of PCB hoahoa ki tetahi keehi whaihua, me te whakamarama i te mahinga me nga wheako whaihua me nga pukenga o te raupaparorohiko hoahoa PCB na roto i te mahinga whakahaere. Ma tenei akoranga e ako nga mohiotanga e pa ana ki nga waea PCB ma te whakamarama i te tirohanga me nga kaupapa o te hoahoa waea waea.

Nga take nui o tenei rangahau:

1. Tirohanga waea me nga maataapono

2.PCB waea waea whakaritenga taketake

3. Te aukati i te mana waea PCB

Nga uauatanga o te ako i tenei waa:

1. Tirohanga waea me nga maataapono

2. Te aukati i te mana waea PCB

1. Tirohanga waea me nga maataapono

In traditional PCB design, the wiring on the board only serves as the carrier of signal connectivity, and the PCB design engineer does not need to consider the wiring distribution parameters.

With the rapid development of the electronic industry, data swallowing from a few megabytes per unit time, tens of megabytes to the rate of 10Gbit/s has brought about the rapid development of high-speed theory, PCB wiring is no longer a simple interconnection carrier, but from the transmission line theory to analyze the impact of various distribution parameters

I te wa ano, kei te piki haere te uaua me te kiato o te PCB i te wa ano, mai i te hoahoa poka noa ki te hoahoa poka moroiti ki te hoahoa poka matapo, kei reira tonu te urunga aukati, ipu tanu, he hoahoa waea PCB tino nui ki kawe mai i nga uauatanga nui i te wa kotahi, me hiahia hoki ki te kaipūkaha hoahoa PCB kia hohonu ake te maarama o nga waahanga tukatuka mo te hanga me te tukatuka PCB.

Na te whakawhanaketanga o te tere tere me te nui o te PCB, he nui ake te hiranga o nga kaiwhakangungu hoahoa PCB mo te hoahoa taputapu, i te wa e nui haere ana nga wero hoahoa PCB, me mohio nga kaiwhakangungu hoahoa kia nui ake te mohio ki nga waahanga mohio.

E rua, momo waea PCB

Ko nga momo waea kei runga i te papa PCB ko te taura tohu, te tuku hiko me te waea whenua. Among them signal line is the most common wiring, the type is more. Still have mono line according to wiring form, difference line.

E ai ki te hanganga a-tinana o te waea waea, ka taea hoki te wehe ki te raina rīpene me te raina microstrip.

Iii. Ko te maatauranga taketake mo nga waea waea PCB

General PCB wiring has the following basic requirements:

(1) Ko te QFP, SOP me etahi atu papa tapawhā takai me kawe atu mai i te pokapū PIN (te tikanga ma te hanga whariki).

(2) Waea (1) QFP, SOP me etahi atu kohinga o nga papa tapawhā mai i te waea, mai i te pokapū PIN (te tikanga e whakamahi ana i te ahua. Ko te tawhiti mai i te raina ki te mata o te pereti kaua e iti iho i te 20MIL.

Panui: i te ahua i runga ake nei, ko te whero te Tuhinga o waho o te papa o waho, a ko te kaakaariki te kaitiaki o te rohe waea poari katoa (ko te Routkeepin he neke atu i te 20mil i whakakotahihia ki te WHIUU).

Note: This board edge also includes window opening, milling groove, ladder, milling thin area by milling cutter processing graphics edge.

(3) I raro i nga taputapu anga whakarewa, kaore e whakaaetia etahi atu kohinga whatunga, me nga waea waea (nga anga whakarewa noa he oscillator karaihe, puhiko, me etahi atu.)

(4) Kaore he raru DRC o te waea taapiri, tae atu ki nga ingoa DRC hapa o te ingoa kotahi, haunga mo te hoahoa hototahi, haunga nga hapa DRC na te taapiri ano i tuku.)

(5) Kaore he hononga honohono i muri i te hoahoa PCB, me te hononga PCB me rite ki te hoahoa ara iahiko.

He is not allowed to attend the Dangline.

(7) If it is clear that non-functional pads do not need to be retained, they must be removed from the light drawing file.

(8) E taunaki ana kia kaua e waiho ki te haurua tuatahi o te tawhiti mai i te ika nui 2MM

(9) It is recommended to use inner wiring for signal cables

(10) It is recommended that the corresponding power plane or ground plane of the high-speed signal area be kept intact as far as possible

(11) E taunaki ana kia tohaina nga waea waea. Me tuu te parahi ki nga waahanga nui kaore he waea waea, engari kaua e raru te arai

(12) E taunaki ana kia haangai katoa nga waea waea, a ko te Angiangi chamfering he 45 °

(13) Ka whakaarohia kia aukati i nga raina tohu mai i te hanga i nga koropiko-roa me te roa o te taha ki runga ake i te 200ML i nga papa e piri ana

(14) It is recommended that the wiring direction of adjacent layers be orthogonal structure

Panui: Ko nga waea waea o nga papa e piri ana me karohia i te huarahi kotahi hei whakaiti i te whakawhiti korero i waenga i nga papa. Mena kaore e taea te karo, ina koa he nui te reeti tohu, me whakaaro te papa rererangi ki te wehe i ia paparanga waea, a me wehe te tohu whenua i ia raina tohu.

4. Te aukati i te mana waea PCB

Description: Line width in PCB processing is divided into two parts, the width of the upper surface and the width of the lower surface.

Ko te hoahoa Maatauranga o te taatai ​​impedance o te raina tohu microstrip tohu-kotahi:

Ko te hoahoa Schematic o impedance tatauranga o te raina microstrip tohu rerekee:

Ko te hoahoa Schematic o impedance tatauranga o te raina Unuhia o te tohu kotahi-mutunga:

Ko te hoahoa Maatauranga o te raina roopu rauropi te tatauranga o te tohu rereke:

Ko te hoahoa Maatauranga o te taatai ​​impedance o te raina tohu microstrip tohu-kotahi (me te waea whenua coplanar):

Ko te hoahoa Schematic o impedance tatauranga o te raina microstrip tohu rereke (me te waea whenua coplanar):

Koinei te tirohanga waea waea me nga maataapono o ALLEgro mo te raupaparorohiko hoahoa PCB.