NEW
Clock Certification and Test Module
6/28/99 -  View
in PDF Format
Leading
Features
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Test module
for Rambus® and other clock sources
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Performs all
DRCG jitter tests
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New
parameters for n-cycle jitter and duty cycle error
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Provides
long capture mode required for statistically significant
results
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Jitter noise
floor of 2 ps
The Clock
Certification and Test Module (CCTM) for Rambus® clock
sources is an enhancement to the LeCroy Jitter and Timing
Analysis (JTA) package.
CCTM is a critical tool for engineers incorporating Rambus
technology into their products or using high-speed clocks
where the measurement of clock jitter is very important. It
operates on LeCroy’s LC584AL and LC584AXL
oscilloscopes. The CCTM uses the high sampling rate (up to
8 GS/s), long memory (up to 16 Mbytes) and accuracy of these
scopes to perform statistically meaningful peak-to-peak and
other jitter measurements.
The CCTM
software package adds enhanced algorithms for very precise
calculation of jitter parameters and an easy way to
automatically configure the scope per Rambus test
requirements. These capabilities combine with the long memory
and high-stability clock in the LC584 series to bring
unmatched power to jitter and timing measurements. No other
instrument on the market can perform the critical set of tests
and analysis for high-speed clocks that is available in this
system.
Now you can
capture up to 1 million or more consecutive clock cycles with
zero deadtime and then immediately apply the power of CCTM to
track signal timing instabilities – with a jitter noise
floor of 2 ps – to zoom in on their causes. Many
measurements, such as n-cycle, require that analysis be
performed on consecutive clock cycles only. Accurate
determination of peak-to-peak values for these measurements
absolutely requires the long capture memory and analysis
capabilities provided by the CCTM and the LC584.
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Click
on Image to view more detail
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Figure
1:Duty cycle error measurement performed on
800,000 clock cycles. The RMS jitter distribution is
4.53 ps with a peak-to-peak jitter range of 39.2 ps.
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Click
on Image to view more detail
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Figure
2:The 2 ms long JitterTrack™ trace of
cycle-to-cycle jitter (lower trace) directly pinpoints
the source of increased cycle-to-cycle jitter due to the
slight AM modulation present on the clock signal (upper
trace).
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Click
on Image to view more detail
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Figure
3: Results of 133,332 measurements of groups of
six cycles reveal clock instability as shown in the
bimodal histogram. In making n-cycle jitter
measurements, short- memory scopes are limited to
capturing 500 or even fewer groups of cycles, resulting
in less accurate peak-to-peak values and distributions.
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Specifications
The Clock
Certification and Test Module contains:
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Advanced
algorithms for calculation of timing parameters with
increased speed and accuracy.
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Customization
of default settings to make Rambus-specified and other
clock tests easy.
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Two new
parameters for measuring n-cycle variations (n = 1-8) and
duty cycle error on a cycle-by-cycle basis.
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Enhanced
jitter measurement accuracy of 2 ps RMS*.
Only the CCTM
and LC584AL/AXL give system integrators who use Rambus
technology the accuracy, measurement algorithms, memory
length, and processing performance they need for highly
accurate measurements of peak-to-peak jitter. And only
LeCroy’s patent pending JitterTrack feature provides the
ability to easily and confidently determine the source of
excessive jitter due to power supply variances, cross-coupling
modulation or other sources.
* Jitter
measurement accuracy is measured using an HP8133A pulse
generator.
Ordering
Information
Click
Here to Request a Quote or Demo or call
1-800-5-LeCroy(1-800-553-2769) in the U.S.A. for more
information. To find a
local sales office near your location, click here.
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Model
#
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Description
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CCTM
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An
application-specific module for testing Rambus
technology and other high-speed clocks.
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RK-CCTM
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Retrofit
of CCTM to a previously delivered oscilloscope.
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Note: The
CCTM package is available as a module for the JTA software
package in combination with a model LC584AL or LC584AXL
oscilloscope.
Copyright ©
June 1999 LeCroy is a registered trademark of LeCroy
Corporation. Rambus is a registered trademark of Rambus Inc.
All rights reserved. Information in this publication
supersedes all earlier versions. Specifications subject to
change without notice.
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