Ọ bụrụ na afọ ọgụgụ isi a, n’ọhịa a, ịchọrọ inwe nka na FPGA, mgbe ahụ ụwa ga -ahapụ gị, Times ga -ahapụ gị.

Ntụle maka sistemụ ọsọ ọsọ PCB design related to serdes applications are as follows:

(1) Microstrip na eriri eriri.

Ahịrị Microstrip na -agagharị n’elu akara mgbama elu nke ụgbọelu ntụnyere aka (GND ma ọ bụ Vcc) nke mgbasa ozi eletrik kewapụrụ iji belata igbu oge; A na -agbagharị wiwi rịbọn n’ime akwa mgbaàmà nke ime ime n’etiti ụgbọ elu ntụaka abụọ (GND ma ọ bụ Vcc) maka mmeghachi ikike ka ukwuu, njikwa impedance dị mfe na mgbaama dị ọcha, dịka egosiri na ọnụ ọgụgụ a.

Ahịrị Microstrip na ahịrị warara kacha mma maka wiring

(2) wiring mgbaama mgbaama dị elu.

Ụzọ wiring a na-ahụkarị maka ụzọ mgbaama dị iche iche dị elu gụnyere Edge Coupled microstrip (akwa oyi akwa), ahịrị eriri agbakọ agbakwunyere (akwa agbakwunyere agbakwunyere, dabara maka ụzọ mgbaama mgbawa dị iche iche SERDES) na Broadside Coupled microstrip, dị ka egosiri na ọnụ ọgụgụ ahụ.

Ejiri ngwa njikọ mgbaama dị elu dị elu

(3) gafere ikike (BypassCapacitor).

Bypass capacitor is a small capacitor with very low series impedance, which is mainly used to filter high frequency interference in high speed conversion signals. Enwere ụdị capacitors uzo atọ etinyere na sistemụ FPGA: sistemụ ọsọ ọsọ (100MHz ~ 1GHz) nke a na-ejikarị na-agafe agafe site na 0.01nF ruo 10nF, nke a na-ekesa n’ime 1cm site na Vcc; Sistemu ọsọ ọsọ (karịa MHZ iri 100MHz), ihe na-agafekarị capacitor bụ 47nF ruo 100nF capacitor tantalum, n’ozuzu n’ime 3cm nke Vcc; Sistemu dị obere (ihe na-erughị 10 MHZ), oghere capacitor na-ejikarị bụ 470nF ruo 3300nF capacitor, okirikiri nhọrọ ukwuu na PCB bụ n’efu.

(4) Capacitance wiring kacha mma.

Capacitor wiring can follow the following design guidelines, as shown.

Capacitive ezigbo wires

Capacitive pin pads are connected using large size through holes (Via) to reduce coupling reactance.

Use a short, wide wire to connect the pad of the capacitor pin to the hole, or directly connect the pad of the capacitor pin to the hole.

LESR capacitors (Low Effective Series Resistance) were used.

Ekwesịrị ijikọ pin ma ọ bụ oghere GND ọ bụla na ụgbọ elu ala.

(5) Isi ihe nke ngwa wiwi elekere sistemụ dị elu.

Zere ịgbagharị zigzag na elekere ụzọ ka o kwere mee.

Gbalịa ka ị na -aga n’otu akwa mgbaama.

Ejila oghere dị ka o kwere mee, n’ihi na oghere ga-ewebata echiche siri ike na enweghị nkwekọrịta.

Jiri eriri microstrip na akwa elu dị ka o kwere mee iji zere iji oghere wee belata igbu oge mgbaama.

Debe ụgbọ elu ala ahụ n’akụkụ akwa mgbama elekere ka o kwere mee iji belata mkpọtụ na ihu igwe. Ọ bụrụ na ejiri akwa mgbama dị n’ime, akwa mgbama elekere nwere ike tinye n’etiti ụgbọ elu ala abụọ iji belata mkpọtụ na nnyonye anya. Mkpebi mgbama mgbaàmà.

Mgbama elekere ga -adabara impedance nke ọma.

(6) Ihe chọrọ nlebara anya na njikọta sistemụ na ngwa ngwa.

Note the impedance matching of the differential signal.

Rịba ama obosara nke ahịrị nrịba ama dị iche iche ka o nwee ike ịnagide 20% nke mbilite mgbaàmà ma ọ bụ oge ọdịda.

Site na njikọta kwesịrị ekwesị, ugboro ole nke njikọ kwesịrị izute ugboro ugboro nke imewe ahụ.

Ekwesịrị iji njikọ njikọ ọnụ dị ka o kwere mee iji zere njikọta sara mbara, a ga-eji iwu nke irighiri ihe 3S zere njikọta ma ọ bụ isi okwu.

(7) Ihe edeturu na nzacha mkpọtụ maka sistemụ ọsọ ọsọ.

Belata nnyonye anya ugboro ugboro (n’okpuru 1KHz) nke mkpọtụ isi iyi kpatara, gbakwunye mkpuchi ma ọ bụ nzacha sekit na njedebe ịnweta isi ike ọ bụla.

Tinye ihe nzacha electrolytic capacitor 100F na ebe ọ bụla ebe ọkụ na -abanye na PCB.

Iji belata mkpọtụ ugboro ugboro, dobe ọtụtụ capacitors na Vcc na GND ọ bụla enwere ike.

Debe ụgbọ elu Vcc na GND n’otu nha, kewapụ ha na dielectrics (dị ka FR-4PCB), ma dọpụta ihe ndị na-enye ike na ọkwa ndị ọzọ.

(8) Sistemu dị elu Gburugburu ala

Gbalịa ịgbakwunye capacitor decoupling na ụzọ mgbaàmà Vcc/GND ọ bụla.

A na-agbakwunye ihe nchekwa mpụga na njedebe mmepụta nke akara mgbanwụ dị elu dị ka counters iji belata ihe achọrọ ikike ịnya ụgbọ ala.

Edebere ọnọdụ Slow Slew (mkpọda-mkpọda-ala) maka akara ngosipụta nke na-achọghị ọsọ ọsọ.

Njikwa ibu reactance.

Belata mgbama mgbagharị elekere, ma ọ bụ kesaa ya ka o kwere mee gburugburu mgbawa.

Ihe mgbaàmà nke na -atụgharị ugboro ugboro dị nso na pin GND nke mgbawa dịka o kwere mee.

Nhazi nke okirikiri oge synchronous kwesịrị izere ntughari ozugbo nke nrụpụta.

Ịgbanwe ọkụ eletrik na ala nwere ike rụọ ọrụ na mkpokọta inductance.