Teledyne LeCroy PeRT3 Eagle Systems - Manual (Page 35)

PeRT 3 Eagle User Manual Version 1.6
LeCroy Corporation
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High Frequency Sinusoidal Jitter
The High Frequency Sinusoidal Jitter panel ("High Freq SJ") allows
the introduction of periodic jitter at controlled frequencies and
amplitudes.
High frequency SJ can be controlled over an amplitude range of 0 to
290 ps in increments of 1 ps.
High frequency SJ can be controlled over a frequency range of 1.0 to
115 MHz in increments of 0.1 MHz.
Low Frequency Sinusoidal Jitter
Low Frequency SJ is analogous to high frequency SJ, and can be
controlled over amplitudes of 400 to 10,000 ps in increments of 50 ps.
The frequency can be controlled from 250 to 2,000 KHz in increments
of 1 KHz.
High frequency SJ and low frequency SJ can be used in any
combination (and also with random jitter) to produce complex yet
reproducible jitter scenarios for testing of serial data devices.
The frequency range of Low Frequency Sinusoidal Jitter is typically
below the frequency that is tracked out by standard PLLs. This means
that typical devices can tolerate Low Frequency Sinusoidal Jitter in excess of several unit
intervals. It also means that measurement and calibration of sinusoidal jitter at low
frequencies require techniques that take into account the effects of any PLL used to
recover the data.
Pattern/Termination
The Pattern/Termination panel allows the user to
define the test pattern to be used during the test,
and to define the termination conditions for ending
the test.
The Pattern is selected from the drop-down menu,
and can be any pattern that is supplied with the
system or has been created by the user using the
Pattern Editor (see later section).
The Terminate after field allows the user to select
the conditions that will terminate the test. There are fields below the Terminate after field
which change depending on the selection made in the Terminate after field. You can
choose from the following options:
Run Forever If Run Forever is selected, the test will continue until the user stops
the test using the Suspend or Stop buttons in the Master Controls .
Max Bit Count If Max Bit Count is selected, the test will continue until the number of
Gbits of data specified in the Max GBits field has been exceeded.
Under nominal conditions, this is equilavent to a fixed time period (that
will depend on the data rate selected or negotiated by the system). In
the marginal test case where the device under test sporadically loses
and regains signal lock, it may take longer to achieve the expected bit