If we want to select the most familiar professional vocabulary for electronic engineers in the past 20 years, eye maps and jitter, as twin sisters, will definitely be in the top 10. So industry discussions and articles on jitter are often seen in various media and platforms. In this issue, we will give a special introduction on jitter testing, including the following topics:
01. Origin of jitter research 02. Basic methods and classical theories of jitter testing and analysis 03. Evolution and new challenges of jitter testing 04. Factors affecting jitter testing results and accuracy
The origin of jitter research jitter testing began to sprout in the 1980s, In 1982, Scottish Technology, the telecommunications network testing department of HP, launched the first jitter measurement instrument for PDH (Plesiochronous Digital Hierarchy) in Scotland, with speeds up to E3 and DS3. Later, in 1984, one of the first 140 Mb/s jitter testers was launched. Launched products and solutions for SONET/SDH jitter testing in the 1990s. In fact, the introduction of jitter in synchronous digital transmission systems (SONET/SDH) and communication systems is mainly used to evaluate packet level transmission delay deviation. Therefore, you can also see that the classic definition of jitter also comes from the industry giant Bell Lab. After entering the 1990s, with the development of the source synchronous clock bus in digital circuit systems, the external synchronous clock frequency gradually became a bottleneck and began to shift to the serial differential bus of embedded clocks. A typical example is that the PCI bus synchronous clock frequency started to shift to PCIE1.0 2.5Gbps when it reached 133MHz. Thus, the measurement of horizontal time parameters in digital circuit systems has shifted from traditional Setup/Hold or Skew measurements to horizontal Jitter measurements. Today, jitter testing is not only an important component and content of many high-speed serial bus and standard consistency testing projects, but also an important method for evaluating system level transmission performance and exploring the root causes of system problems. Therefore, conducting in-depth exploration and research on jitter has profound significance and value at all times
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China