![]() ![]() Original S-parameters and Touchstone 1.0 only allow the single reference port for one model, but Touchstone 2.0 enables multi-reference ports in an S-parameters model. What do the S-parameters contain? An S-parameters model contains the information for the gain/loss and phase against reference resistance port(s) on the frequencies. Touchstone 2.0 is still not supported by a number of EDA vendors. Currently, Touchstone 1.0 is widely supported by most of the tools. Touchstone 2.0 added resistance per port option for Power Delivery System and mixed-mode features for differential setups. ![]() In 2009, Touchstone 2.0 was ratified by IBIS. The word “Touchstone” was issued by EEsof (a part of Agilent Technologies, now Keysight). Collin’s book is extensively annotated, including an author index, which reads like a Who’s Who of electromagnetic theory for the first half of the twentieth century. The scattering wave concept was further popularized around the time that Kaneyuki Kurokawa of Bell Labs wrote his 1965 IEEE article “Power Waves and the Scattering Matrix.” Also, Robert Collin’s textbook, Field Theory of Guided Waves, published in 1960, has a brief discussion on the Scattering matrix. It helped that during the 1960s, Hewlett Packard introduced the first microwave network analyzers. The 1948 Radiation Laboratory series, “Principles of Microwave Circuits,” introduced the emerging microwave community to practical approaches to solving microwave design problems using scattering parameters in the design of circuits. S-parameters are related to power waves and eliminate many of these issues. At higher frequencies, the concept of voltages and currents became more difficult to relate to network performance – especially in networks using transmission lines like waveguides. S-parameters refer to the scattering matrix of a microwave network the “S” in S-parameters refers to scattering.īefore the 1950s and the extensive use of high-frequency systems, network parameters like Y- and Z-parameters were the primary method of characterizing circuit performance. We also will discuss its advantages and disadvantages and how to use the tool to overcome the issues. In this post, I’ll introduce the history and content of S-parameters/Touchstone®. Still, it does have some disadvantages if a lack of data accuracy or/and sufficiency is present. However, it is becoming more popular because it covers good information in a simplified behavioral format. The S-parameters/Touchstone® is nothing new. In past years, more design engineers started to use S-parameters/Touchstone® for Signal Integrity and Power Integrity analysis.
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