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Clock Recovery CR/CR HS 12.5/14.3/26/28 Gb/s
CRJ 12500A & Option 143
CR with Jitter Analysis
DCRJ Digital Communications Receiver with Jitter Analysis
PLA Clock PLL Response Analyzer
Clock Recovery Feature Selection Guide

 

BERTScope CRJBERTScope CRJ Variable Clock Recovery Jitter Spectrum Analyzer
RELATED MATERIAL
Download PDF CR 14300A & CRJ 12500A Option 143 Product Brief (PDF)
Download PDF CRJ 12500A Product Brief (PDF)
Download PDF CR/CR HS 25000A/28000A
Product Brief (PDF)
Download PDF CR 12500A Product Brief (PDF)
Download PDF Extended Loop Bandwidth Option (PDF)
Download PDF Signal Integrity Success in Computer and Storage Applications Technical Brief (PDF)
Request posters Request Free "Anatomy of Clock Recovery" posters
Clock Recovery Duty Cycle Dependency measurement screen
Jitter Spectrum and DCD Measurements

The BERTScope™ CRJ Variable Clock Recovery Jitter Analyzer is based on our BERTScope CR, the highest performance instrumentation-grade adjustable clock recovery product available today. The CRJ retains all of the functionality of the current BERTScope CR, with additional Jitter Analysis capabilities:

Jitter Spectrum Measurements

The jitter spectrum display lets you quickly validate device compliance to serial data standards, such as PCIe 2.0, which specify a total jitter value over a band-limited range of frequency. These measurements are also very useful in isolating the source of excessive jitter in a system.

Jitter Spectrum is a unique tool, in the respect that it is extracted from the signal in the clock recovery circuit. While some sampling oscilloscopes can perform jitter spectrum measurements on repetitive signals, they can not measure jitter at frequencies below the band-pass frequency of the clock recovery loop, as these components are tracked and removed during the sampling process.

Duty Cycle Dependent Measurements

The BERTScope CRJ also directly measures Duty Cycle Dependent Jitter (DCD). The result appears in the BERTScope CRJ Display with a table of values and a graphical Level Histogram.

DCD Jitter is a required measurement in some serial data standard compliance tests. It is a useful tool in system design, for identifying jitter sources.

CR control on BERTScope analyzerThe BERTScope CRJ can combine with a BERTScope Signal Integrity Analyzer to directly measure jitter components from the serial input data while simultaneously generating a recovered clock. A Jitter Spectrum View in the analyzer's user interface measures spectral analysis of jitter components, along with a direct measure of duty cycle dependent jitter. Results are displayed as a plot of jitter magnitude vs. frequency. The Y-axis of the graph is scaled in %UI or time (ps). The X-axis measures frequency, with a range of 200 Hz to 90 MHz and 100 Hz resolution.

In addition, the BERTScope CRJ operates stand-alone, providing the same unmatched performance with sampling oscilloscopes and other bit error rate test instruments.

Features of the CRJ:  
  • Full BERTScope CR functionality, including compliant clock recovery from 150 Mb/s to 12.5 Gb/s, or to 14.3 Gb/s with Option 143; adjustable, self-measuring loop BW and peaking
  • Powerful jitter measurement capability to 12.5 Gb/s
  • Direct spectral analysis of jitter components
  • ‘Spectrum analyzer’ display with cursor measurements of jitter and frequency
  • User-settable frequency gated measurements for band-limited integrated jitter
    • Preset band limits for PCIe 2.0 jitter spectrum
  • Direct measure of Duty Cycle Dependent (DCD) jitter
  • Passive ‘Pass through’ signal path — neither timing nor amplitude on input signal are regenerate
  • Stand-alone software available for control through a PC.
  • Combine with a BERTScope Signal Integrity Analyzer to use the new Jitter Spectrum View included in the analyzer's user interface.
Maximum Data Rate, Gb/s Models Jitter Spectrum to
12.5 GHz
Optional PLL Analysis (Option PCIE) Loop Bandwidths, Maximum Rate of Operation Data Through-Path
Standard 12 MHz 24 MHz Extension (Option XLBW) Internal Pick-Off Tee High Sensitivity, Direct Input
12.5  CR 12500A 12.5 Gb/s 12.5 Gb/s
 CRJ 12500A
 CRJ 125-PCIE
14.3  CRJ 12500A
   Option 143
14.3 Gb/s *
 CR 14300A
26  CR 25000A 26 Gb/s
 CR HS 25000A
28.6  CR 28000A 28.6 Gb/s *
 CR HS 28000A

*Data through-path recommended for use below 12.5 Gb/s. Above this rate, use of an external
  pick-off tee is advised.

Ordering Information:

  Product Code   Description
  CRJ12500A   BERTScope CRJ Variable Clock Recovery Instrument and Jitter Analysis
  CRJ12500A-Option 143   BERTScope CRJ Variable Clock Recovery to 14.3 Gb/s with Jitter Analysis to 12.5 Gb/s
  Option XLBW   Extended Loop Bandwidth Option to 12.5 Gb/s

Extended warranty and product upgrade options are available. Contact your sales representative for more information.

 

 

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