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SDS6000L User Manual
2 6 0 i n t . s i g l e n t . c o m
28.3 Clock Recovery
Clock recovery is a feature that provides an ideal clock for comparison to actual signal edges. It is the
key step in constructing an eye. The eye diagram can be constructed only when the reference clock is
recovered from the data correctly. Click Clock Recovery in the eye diagram menu to open the dialog
box.
A. Set the clock recovery method, Constant
Frequency, or PLL. See Table 28.2 for
details.
B. Choose the mode of finding rate between
Manual and Automatic.
C. Choose the find rate between Every and
First. The oscilloscope will perform a
clock recovery for each acquisition in the
“Every” mode and at each new frame, the
eye diagram will replace the clock rate
with the one from the previous frame. In
the “First” mode, the oscilloscope uses
the clock recovered from the first frame
for all the frames
Table 28.2 Description of Clock Recovery Method
Clock Recovery
Method
Description
Constant
Frequency
The clock is assumed to be a constant frequency and recovered
through the linear fitting based on the least-squares method.
Phase-Locked
Loop
The value of each reference clock edge will be calculated by the
PLL software based on the sampled signal. Using this method, the
low-frequency components in the jitter can be removed because of
the tracking capacity of the PLL. This method supports First Order
Golden PLL and its loop bandwidth can be configured by changing
the damping factor.
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