1. The origin of jitter research: jitter testing began to sprout in the 1980s. Scottish Technology, the telecommunications network testing department of HP, launched the first jitter measurement instrument for PDH (Plesiochronous Digital Hierarchy) in Scotland in 1982, with a speed of 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. 2. The basic methods and classic theories of jitter testing and analysis were widely used in various industries in the 1990s, along with the serial differentiation of digital circuits and systems. Software and hardware systems with x86 processors as the core were also widely used, including the testing and measurement industry. Oscilloscopes also began to be fully equipped with more powerful x86 processors and Windows operating systems, followed by the comprehensive development and promotion of various algorithm programs, This includes jitter measurement algorithms and classical separation theories
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