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參數(shù)資料
| 型號(hào)： | QT78N-9-M-FREQ1 |
| 廠商： | Q-TECH CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 0.125 MHz - 15 MHz, LVHCMOS OUTPUT |
| 封裝： | ROHS COMPLIANT, HERMETIC SEALED, MINIATURE, CERAMIC, J-LEAD, SMD, 4 PIN |
| 文件頁(yè)數(shù)： | 6/6頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | QT78N-9-M-FREQ1 |
66
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
Q-TECH
CORPORATION
QT78 SERIES
HIGH-RELIABILITY MINIATURE CLOCK OSCILLATORS
1.8 to 5.0Vdc
-
15kHz to 150MHz
QT78 (RevisionC,July2008)(ECO#9380)
Phasenoiseismeasuredinthefrequencydomain,andisexpressedasaratioofsignalpowertonoisepowermeasuredina1Hz
bandwidthatanoffsetfrequencyfromthecarrier,e.g.10Hz,100Hz,1kHz,10kHz,100kHz,etc. Phasenoisemeasurementismade
withanAgilentE5052ASignalSourceAnalyzer(SSA)withbuilt-inoutstandinglow-noiseDCpowersupplysource. TheDCsource
isfloatedfromthegroundandisolatedfromexternalnoisetoensureaccuracyandrepeatability.
Inordertodeterminethetotalnoisepoweroveracertainfrequencyrange(bandwidth),thetimedomainmustbeanalyzedinthe
frequencydomain,andthenreconstructedinthetimedomainintoanrmsvaluewiththeunwantedfrequenciesexcluded. Thismaybe
donebyconvertingL(f)backtoSφ(f)overthebandwidthofinterest,integratingandperformingsomecalculations.
ThevalueofRMSjitteroverthebandwidthofinterest,e.g.10kHzto20MHz,10Hzto20MHz,represents1standarddeviationof
phasejittercontributedbythenoiseinthatdefinedbandwidth.
FigurebelowshowsatypicalPhaseNoise/PhasejitterofaQT78AC6,5.0Vdc,80MHzclockatoffsetfrequencies10Hzto5MHz,and
phasejitterintegratedoverthebandwidthof12kHzto1MHz.
PhaseNoiseandPhaseJitterIntegration
PeriodJitter
As data rates increase, effects of jitter become critical with
its budgets tighter. Jitter is the deviation of a timing event
of a signal from its ideal position. Jitter is complex and is
composed of both random and deterministic jitter
components. Randomjitter(RJ)istheoreticallyunbounded
and Gaussian in distribution. Deterministic jitter (DJ) is
bounded and does not follow any predictable distribution.
DJ is also referred to as systematic jitter. Atechnique to
measureperiodjitter(RMS)onestandarddeviation(1σ)and
peak-to-peakjitterintimedomainistouseahighsampling
rate(>8Gsamples/s)digitizingoscilloscope. Figureshows
an example of peak-to-peak jitter and RMS jitter (1σ) of a
QT78AC-24MHz,at5.0Vdc.
RMSjitter(1σ):5.37ps
Peak-to-peakjitter:43ps
Symbol
Definition
∫L(f)
Integratedsinglesidebandphasenoise(dBc)
Sφ(f)=(180/Π)x
√2∫L(f)df
Spectraldensityofphasemodulation,alsoknownasRMSphaseerror(indegrees)
RMSjitter=Sφ(f)/(fosc.360°)
Jitter(inseconds)duetophasenoise. NoteSφ(f)indegrees.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QT2-AC-9-M-FREQ1 | CRYSTAL OSCILLATOR, CLOCK, 0.000000045 MHz - 12 MHz, ACMOS OUTPUT |
| QT2-AC-D-6-FREQ1 | CRYSTAL OSCILLATOR, CLOCK, 0.000000045 MHz - 12 MHz, ACMOS OUTPUT |
| QT2-C-D-4-M-FREQ1 | CRYSTAL OSCILLATOR, CLOCK, 0.000244 MHz - 4 MHz, CMOS OUTPUT |
| QT2-HC-11-FREQ2 | CRYSTAL OSCILLATOR, CLOCK, 12 MHz - 85 MHz, HCMOS OUTPUT |
| QT2-N-D-12-M-FREQ2 | CRYSTAL OSCILLATOR, CLOCK, 12 MHz - 85 MHz, LVHCMOS OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
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| QT7F | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
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| QT7M | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
| QT7MB | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 PI |
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