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參數(shù)資料
| 型號： | AN-03 |
| 英文描述： | SONET OC-12 Jitter Measurement |
| 中文描述： | 與SONET OC - 12抖動測量 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 56K |
| 代理商： | AN-03 |
APPLICATION NOTE
AN-03
3
Micrel
JITTER TRANSFER
Jitter Transfer Definition
Bellcore TR-NWT-000499 (Issue 4), section 7.3.2:
"The transfer of jitter through an individual unit of digital
equipment is characterized by the relationship between the
applied input jitter and the resulting output jitter as a function
of frequency. For equipment in which a linear process
describes the transfer of jitter from the input to the output port,
the jitter transfer function is the ratio of the output jitter
spectrum to the applied (deterministic) input jitter spectrum.
(The term transfer function implies a linear process, where the
conventional definition of linearity applies, i.e., a process that
is both additive and homegeneous.)"
Jitter Transfer Requirement
Bellcore TA-NWT-000253 (Issue 2), section 5.6.3.2: "For
Category II interfaces, the jitter transfer function shall be under
the curve in Figure 4, when input sinusoidal jitter up to the
mask level in Figure 5 is applied, with the parameters specified
in Figure 4 for each OC-N rate."
Figures 4 and 5 show the Bellcore specification for Jitter
Transfer.
ITU/CCITT Recommendation G.958, section 6.3.2, is stated
similarly to Bellcore specification.
Measuring Jitter Transfer on the SY69712
Jitter Transfer is measured by applying the appropriate
reference frequency (77.76MHz, 51.84MHz or 19.44MHz) to
the RFCLKIN. The jitter on the synthesized 622MHz Clock
output is then measured and compared to the jitter on the
RFCLKIN to determine the jitter transfer of the Transmit PLL.
Figure 3a
Test Setup for Measuring Jitter Transfer
on the SY69712
CH 1
CH 2
Filter
CKE622
SY69712
Filter
77.76MHz/
51.84MHZ/
19.44MHZ
HP 3325B Synthesizer
Function Generator
Modulation Source
HP 70841B Pattern Generator
& HP 70311A Clock Source
HP 70820A Microwave Transition Analyzer &
HP 70004A Display
RFCLKIN
Transmit
÷
8 /
÷
12 /
÷
32
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