Kristali osilatɛri ka yɛlɛmani kunfɛ, yɛlɛmani dantigɛlen ani fazi mankan ɲɛfɔli fɛsɛfɛsɛnin

Kristali osilatɛri ka yɛlɛmani kunfɛ, yɛlɛmani dantigɛlen ani fazi mankan ɲɛfɔli fɛsɛfɛsɛnin

Kristali osilɛri (XO/TCXO/OCXO) ye lɛrɛ dusukun ye elekitoroniki sisitɛmu kɔnɔ, a be wagati sɛgɛsɛgɛli di CPUw, FPGAw ani -teliyaba yɔrɔw ma. Jitter ye jateminɛ jɔnjɔn ye ka lɛrɛ tiɲɛtigiya sɛgɛsɛgɛ - a be wagati yɛlɛmani yira lɛrɛ tagamasiɲɛ gɛrɛfɛla yɛrɛ yɛrɛ ni lɛrɛ ɲuman gɛrɛfɛla cɛ, min be faamu ka caya i n’a fɔ lɛrɛ "waati fili".

Kristali yɛlɛmayɛlɛmalan ka yɛlɛmayɛlɛma tɛ bɔ yɔrɔ kelen na; a be se ka tilan yɔrɔba fila la: Jitɛri min be dantigɛ (DJ) ani Jitɛri min be kɛ kunfɛ (RJ). Ɛnsɛniyeri la, yɛlɛmani hakɛ be jati ni paramɛtiriw ye i n’a fɔ RMS Fazi Jitɛri, RMS Jitɛri Wagati, ani Sikili-ka -Sikili (CC) Jitɛri. O paramɛtiriw be taga ɲɔgɔn fɛ nka u be jitter hakɛ sifa caaman ɲɛfɔ.

1. Jitɛri sifa fila: Jitɛri min be dantigɛli kɛ (DJ) ani jitɛri min be kɛ kunfɛ (RJ) .

O ye kristali osilatɛri jitɛri ka sɛrɛkili nafamanba ye. O fila tɛ kelen ye pewu u bɔyɔrɔ, u kɛcogo ani u ka se ka baara kɛ cogo min na.

1.1 Jitɛri min be dantigɛli kɛ (DJ)

Jitter min be to ka kɛ, min be se ka nɔfɛtagama, ani min be dan na, o be jati i n’a fɔ "fili min be se ka labɛn kɛnɛma mɔgɔw ka donɲɔgɔnna fɛ."

O bɔyɔrɔw: Kuran dilanyɔrɔ yɛlɛmani, PCB ka mankan, doni bɛnbaliya, EMI, baarakɛcogo yɛlɛmani, yɛlɛmani mankan ɲɔgɔn fɛ

A ka kɛcogow: A be se ka lase mɔgɔw ma, a tɛ -Gaussian tilanyɔrɔ ye, a be dan na, a be se ka tunu

Ɲɛyirali: Lɛrɛn min be yuguyugu tuma o tuma; fili be lɔ ni yɛrɛyɛrɛli be lɔ

1.2 Jitɛri min be kɛ kunfɛ (RJ)

Jitter min tɛ bɛn, min tɛ se ka fɔ ka bila, ani min tɛ ni sanfɛ dan dafanin ye, o be “mankan naturel inhérent” yira min be sɔrɔ kristali oscillateur la.

A bɔyɔrɔw: Funteni mankan, yɛlɛmayɛlɛma mankan, yɛlɛmayɛlɛma min be kɛ mɔgɔw fɛ ani farikolo mankan wɛrɛw .

A ka kɛcogow: Gauss ka tilanyɔrɔ, a be se ka ban pewu, a be dɔgɔya dɔrɔn .

Ɲɛyirali: Yɛlɛmani misɛn minw be kɛ lɛrɛ yɛrɛ kɔnɔ .

1.3 Jitɛri bɛɛ (TJ)

Jitter total yɛrɛ yɛrɛ ye fila nunu ka ɲɔgɔnkunbɛn ye.RMS hakɛw be fara ɲɔgɔn kan ni fanga farali ye:TJRMS =RJRMS2 +DJRMS2

2. Ka kan ka -lɔnniya kumadenw lɔn: Jitter paramɛtiri jɔnjɔn 4

2.1 RMS fazi yɛlɛmani (kunfɛ)

Jitter (RJ) dɔrɔn lo be sɔrɔ a kɔnɔ

A be kristali osilitɛri kɔnɔna fazi mankan dugukolo yira

A be kristali yɛrɛ ka ɲumanya yira, a tɛ bɔ sɛrɛkili ka yɛlɛmani na

2.2 RMS fazi yɛlɛmani (a bɛɛ)

RJ + DJ fana be yen

Fazi jitter mɛtiri min be baara kɛ ka caya min be-sisitɛmu baarakɛcogo yɛrɛ yɛrɛ yira

2.3 RMS wagati yɛlɛmani

RMS yɛlɛmani ka bɔ yɛlɛmani kelen wagati la ka bɔ yɛlɛmani janya ɲuman na

A be wagatijan -basigili yira

2.4 Sikili-ka -Sikili yɛlɛmani (CC yɛlɛmani)

Danfara min be yɛlɛmani fila cɛ minw be ɲɔgɔn gɛrɛfɛ

A be yɛlɛmaniw yira yɔrɔnin kelen; kɔrɔfɔliba lo - teliyaba yɔrɔw kama

3. Jɛnɲɔgɔnya min be paramɛtiriw ni DJ/RJ cɛ .

Kuma surun:

Jitter fazi kunfɛta dɔrɔn=RJ saniyanin

Tɔw bɛɛ=RJ + dantigɛli ɲɔgɔndan (DJ)

4. Ɛnsɛniyeri ka baarakɛcogo: i be se ka gwɛlɛyaw kɔrɔ fɔ cogo min na ani k’u ɲɛnabɔ cogo min na .

A’ ye kristali yɛlɛmayɛlɛmalan ka ɲumanya sɛgɛsɛgɛ → a’ ye RMS Fase Jitter sɛgɛsɛgɛ (Kunfɛ)

Aw ye -sitɛmu baarakɛcogo sɛgɛsɛgɛ → RMS Fase Jitter sɛgɛsɛgɛ (A bɛɛ)

Ɲɛyirali minw be kɛ teliya la (PCIe/USB) → u be sinsin CC Jitter kan

Ni jitter ka ca kojugu, a filɛ fɔlɔ: fanga, dugukolo, crosstalk, doni (DJ bɔyɔrɔw bɛɛ) .

5. Jɛnɲɔgɔnya min be jitter ni phase mankan cɛ (waati yɔrɔ ↔ siɲɛ hakɛ yɔrɔ)

5.1 Hakilina jɔnjɔn kumasen kelen kɔnɔ

Fazi mankan=siɲɛ hakɛ-yɔrɔ yirabaga

Fasi jitɛri=wagati-yɔrɔ yirabaga

U ye warigwɛ kelen faan fila ye ani u be se ka yɛlɛma ka kɛ ɲɔgɔn ye.

5.2 Bataki jɔnjɔnw

RMS Random Phase Jitter↔ be jati ka ɲɛ ni fazi mankan donni ye bandiwizi dantigɛnin dɔ kan .

Jitter (DJ)↔ be bɛn ni spurs danfaraninw ye fazi mankan jatebɔsɛbɛn kɔnɔ

Random Jitter (RJ)↔ be bɛn ni mankan min be to ka kɛ duguma, o ye fazi mankan ye

5.3 Ɛnsɛniyeri yɛlɛmani

Ka fazi mankan L(f) don ɲɔgɔn na yɔrɔ dɔ la, o be RMS Phase Jitter di.

Faamuyali nɔgɔman:

Fazi mankan kuru hakɛ → be jitter bonya dantigɛ

Duguma & pɛtɛnin → jitter fitinin

Ɲɛyirali fɛ, mɔgɔw be ɲɔgɔn minɛ (DJ)

5.4 Kariti min be se ka faamu

Fasi mankan dugukolo → Jitter kunfɛ (RJ) (a tɛ se ka bɔ yen)

Fasi mankan spurs → Jitter deterministique (DJ) (be se ka gwɛlɛyaw ɲɛnabɔ)

Ka mankanw bɛɛ don ɲɔgɔn na → RMS Phase Jitter bɛɛ

6. Ultra laban -Kuma surun

Jitter be ni suguya fila ye:

DJ (Jitter latigɛnin): kɛnɛma yɛlɛmani, min be se ka bɔ yen

RJ (Jitter kunfɛ): mankan min be sɔrɔ kristali kɔnɔ, min tɛ se ka bɔ yen

Paramɛtiri minw ka ca:

RMS ka yɛlɛma yɛlɛma=RJ saniyalen

RMS ka yɔrɔ bɛɛ yɛlɛmani=RJ + DJ

Wagati yɛlɛmani=kelen-basigi

CC jitɛri=gɛrɛfɛ-yɛlɛma yɛlɛmani

Jitter ↔ Fazi mankan:

Fazi Mankan (frekansi yɔrɔ) ↔ Fazi Jitter (waati yɔrɔ)

Mankan dugukolo → RJ

Spurs → DJ

Fasi mankan ɲɔgɔndan → be RMS Fasi Jitter bɔ ka ɲɛ