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Fastest total-jitter measurement?

Posted: 15 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:agilent technologies? tj? total jitter? bert? bit error ratio tester?

Offering an measurement technique that promises to reduce test times by a factor of 40, test equipment maker Agilent Technologies announced what it claims is the industry's fastest TJ (total jitter) measurement capability for high-performance BERTs (bit error ratio testers). Appropriately enough, Agilent calls its new software product Fast TJ.

The measurement of TJ is important to ensure the proper working of high-speed devices associated with technologies such as PCI Express II, Serial ATA III, and 8X Fiber Channel.

Days to minutes

According to the company, this new measurement enables you to perform high-quality device characterization, speeding the development of new products. "This makes a significant contribution to testing by reducing the measurement time from days to minutes," avows Sigi Gross, VP and GM of Agilent's Digital Verifications Solutions Division.

Gross explains that to ensure an accurate measurement, the test environment must be precisely controlled. This leads to very few total jitter measurements in a design. "The Fast TJ measurement technique uses a new statistical algorithm that is up to 40 times faster," says gross, "which enables R&D engineers to run TJ measurements more often, resulting in a better device characterization."

Ease of use

In use, Agilent's Fast TJ measurement is also simple to make, requiring you to select only the desired BER (bit error ratio) and the resolution accuracy. The uncertainty of the TJ measurement is also determined, which defines the significance of the result. The Fast TJ measurement is independent of jitter modeling, and works on any jitter distribution, further increasing overall confidence in your measurement.

Agilent's new Fast TJ measurement software is the implementation of the Total Jitter Measurement at Low Probability Levels, Using Optimized BERT Scan Method paper, presented at the DesignCon West conference in January 2005.

The Fast TJ measurement is included in the new firmware releases of Agilent's ParBERT 81250 measurement suite and the company's high-performance N4901B/02B Serial BERTs. These firmware updates are free for download.

The ParBERT 81250 is Agilent's modular BER test approach for parallel and multiple serial communication ports operating at speed up to 13.5Gbps. The company's N4900 Serial BERT family includes high-performance N4901B/02B Serial BERTs as well as a new cost-effective N4906B Serial BERT, testing up to 12.5Gbps.

- Alex Mendelsohn


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