|
83054 Datasheet, PDF (7/14 Pages) Integrated Device Technology – Maximum output frequency | |||
|
◁ |
83054 DATA SHEET
ADDITIVE PHASE JITTER
The spectral purity in a band at a speciï¬c 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 speciï¬ed plot in many applications. Phase
noise is deï¬ned as the ratio of the noise power present in a 1Hz
band at a speciï¬ed 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 speciï¬ed, the phase noise
is called a dBc value, which simply means dBm at a speciï¬ed 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 @ 155.52MHz
(12kHz to 20MHz) = 0.19ps typical
OFFSET FROM CARRIER FREQUENCY (HZ)
As with most timing speciï¬cations, phase noise measurements has
issues relating to the limitations of the equipment. Often the noise
ï¬oor of the equipment is higher than the noise ï¬oor of the device.
This is illustrated above. The device meets the noise ï¬oor of what
is shown, but can actually be lower. The phase noise is dependent
on the input source and measurement equipment.
REVISION C 3/19/15
7
4:1, SINGLE-ENDED MULTIPLEXER
|
▷ |