Mastering High-Speed ​​DSP System PCB Dhizaini Yekuita Kwakaringana

Sezvo huwandu hwemachip huchikwira, huwandu hwemachip huri kuwedzera, zvichikonzera kuchinja kwekurongedza kwemidziyo kubva kuDIP kuenda kuOSOP, SOP kuenda kuPQFP, uye PQFP kuenda kuBGA . Pakeji yeBGA, kunyanya mumidziyo yeTMS320C6000 series, inopa mikana yekubudirira kwepamusoro, mikana yekugadzirisa yakaderera, uye kuvimbika kwakanyanya, zvichiita kuti iwedzere kufarirwa. Zvisinei, kugadzira pakeji yeBGA inzira yakaoma mukuita masisitimu emuviri, inosanganisira matekiniki akawanda edhijitari ekugadzira macircuit.

Mune masisitimu ekumhanya-mhanya, kukanganiswa kweruzha ndicho chinhu chinonetsa zvikuru, nemwaranzi uye kudhumhana kunoitika mumaseketi akakwira-frequency, uye nyaya dzakaita sekurira, kuratidzira, uye crosstalk kubva pakukurumidza kumucheto. Kutadza kufunga nezvehunhu hwakakosha hwekumisikidzwa kwechiratidzo chepamusoro-soro uye nzira inogona kukonzera dhizaini isina kunaka yebhodhi redunhu. Naizvozvo, kubudirira kwePCB dhizaini kwakakosha muDSP redunhu dhizaini maitiro.

Hunhu hwekugadzira PCB hwakakosha sezvo huchishandura pfungwa dzekugadzira dzakanakisa kuita chokwadi. Pano, tinokurukura nyaya dzinoverengeka dzakakosha dzekufunga nezvekugadzira bhodhi rePCB rakavimbika mumasisitimu eDSP anomhanya kwazvo.

Simba Dhizaini

Simba uye Ground Decoupling

Sezvo DSP inoshanda mafrequency inowedzera uye zvikamu zvinowedzera compact, yakawanda-layer board dhizaini inowanzoshandiswa. Chigadziko chakatsaurirwa chinokurudzirwa kune magetsi uye pasi. Magetsi emagetsi akasiyana (semuenzaniso, DSP's I/O magetsi emagetsi uye core power supply voltage) anogona kushandisa ndege dzemagetsi dzakasiyana. Kuchengetedza nzvimbo uye kuderedza nhamba vias, zvakawanda chip capacitors anogona kushandiswa, nokungwarira kutarira upamhi nechokwadi zvakakwana routing kugona.

Power Distribution uye Wiring Mitemo

Funga kupatsanura analogi uye dhijitari magetsi emagetsi kuti aparadzanise masaini anonzwika kubva kune ruzha. Semuenzaniso, high-speed, high-precision analog components zvinowanzoparadzaniswa kubva kune zviratidzo zvedhijitari kudzivirira kukanganisa.

Software uye Hardware Anti-Kupindira Dhizaini

Mukumhanya-mhanya kweDSP maapplication, kupindira kwemagetsi kunogona kukanganisa kuyerera kweDSP, zvichitungamira mukusashanda zvakanaka kana kukuvara kwechikamu. Zvakakosha kushandisa matanho ekurwisa-kupindira anobudirira:

1. Hardware Anti-Kupindira Dhizaini:
   • Hardware Filters: RC mafirita anogona kunetesa zvakanyanya-yakawanda-frequency kupindira masaini.
   • Optimal Grounding: Kugadzira yakaderera-impedance, yakakura-nzvimbo yepasi ndege yakakosha pakupa nzira yekudzoka kune yakakwira-frequency currents uye kuderedza. Ichimura uye RFI.
   • Matanho ekudzivirira: Zvishandiso zvakatenderedza zvine ganda resimbi uye nekudzika pasi zvinokwanisa kudzivirira kukanganiswa kwemagetsi.
   • Opto-Electrical Isolation: Optoelectronic isolators inogona kudzivirira kupindirana pakati pemabhodhi edunhu akasiyana.
2. Software Anti-Kupindira Dhizaini:
   • Digital Sefa: Shandisa dhijitari kusefa kuti ubvise ruzha kubva kune analog yekupinza masaini.
   • Musungo Setting: Gadzira chirongwa chebhutsu munzvimbo dzisina kushandiswa kutora uye kugadzirisa kukanganisa kuyerera kwechirongwa.
   • Instruction Redundancy: Isa mirairo ye-no-operation mushure me-double-byte kana matatu-byte mirairo kudzivirira otomatiki chirongwa kuurayiwa kana kukanganisa.
   • Nguva yeWatchdog: Shandisa imbwa yenguva yekumisikidza zvakare DSP kana yakanamira mune isingaperi loop.

Electromagnetic Compatibility (EMC) Dhizaini

Kugadzirwa kweEMC kunoita kuti zvishandiso zvemagetsi zvishande zvakanaka munzvimbo dzakaoma dzemagetsi, zvichidzivirira kukanganiswa kwekunze uye kuderedza kuburitswa kwemhepo. Matanho ekuderedza kutaurwa kwemagetsi anosanganisira:

1. Kusarudza Inonzwisisika Widths: Shandisa waya pfupi uye yakafara kudzvinyirira kupindira. Wachi inotungamira uye mitsara yemasaini emutyairi webhazi inofanirwa kunge iri pfupi sezvinobvira.
2. Mesh Wiring Chimiro: Shandisa yakaumbwa zvakanaka mesh wiring chimiro, ine yakachinjika uye yakatwasuka wiring layer yakapatsanurwa.

mhedziso

Yepamusoro-mhando PCB dhizaini yakakosha pakushandura dhizaini yedzidziso kuita chokwadi chinoshanda mune yakakwirira-kumhanya DSP application masisitimu. Sezvo DSP wedunhu mafambisirwo achiwedzera uye pini density inokura, kuve nechokwadi chemhando yechiratidzo chinowedzera kunetsa, zvichiita kuti mashandiro eiyo system aswedere pedyo nemhando yePCB board dhizaini.