ICS853S01I Datasheet, PDF (6/23 Pages) Integrated Device Technology – One LVPECL output pair

ICS853S01I Data Sheet
2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
Additive Phase Jitter
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.
Additive Phase Jitter @ 622MHz
12kHz to 20MHz = 0.024ps (typical)
Offset from Carrier Frequency (Hz)
As with most timing specifications, phase noise measurements has
issues relating to the limitations of the equipment. Often the noise
floor of the equipment is higher than the noise floor of the device. This
is illustrated above. The device meets the noise floor of what is
shown, but can actually be lower. The phase noise is dependent on
the input source and measurement equipment.
The source generator used is, "IFR2042 10kHz – 56.4GHz Low
Noise Signal Generator as external input to an Agilent 8133A 3GHz
Pulse Generator".
ICS853S01AGI REVISION A OCTOBER 29, 2012
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©2012 Integrated Device Technology, Inc.