参数资料
型号: ICS87021AMILFT
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 87021 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
封装: 3.90 X 4.90 MM, 1.37 MM HEIGHT, ROHS COMPLIANT, MS-012, SOIC-8
文件页数: 8/12页
文件大小: 365K
代理商: ICS87021AMILFT
IDT / ICS LVCMOS CLOCK GENERATOR
5
ICS87021AMI REV. A MAY 4, 2007
ICS87021I
÷1/÷2 DIFFERENTIAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
ADDITIVE PHASE JITTER
Additive Phase Jitter @ 250MHz
(12kHz to 20MHz) = 0.18ps typical
The spectral purity in a band at a specific offset from the
fundamental compared to the power of the fundamental is called
the dBc Phase Noise. This value is normally expressed using a
Phase noise plot and is most often the specified plot in many
applications. Phase noise is defined as the ratio of the noise power
present in a 1Hz band at a specified offset from the fundamental
frequency to the power value of the fundamental. This ratio is
expressed in decibels (dBm) or a ratio of the power in the 1Hz
band to the power in the fundamental. When the required offset
is specified, the phase noise is called a dBc value, which simply
means dBm at a specified offset from the fundamental. By
investigating jitter in the frequency domain, we get a better
understanding of its effects on the desired application over the
entire time record of the signal. It is mathematically possible to
calculate an expected bit error rate given a phase noise plot.
OFFSET FROM CARRIER FREQUENCY (HZ)
SSB
P
HASE
N
OISE
dB
c
/H
Z
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