This is partly because it was so simple and partly because it was one company driving it. Remarkably, from its origins in 1987 until 2002, there was no formal documentation for the Touchstone format. With their adoption, it became the defacto industry standard. After Hewlett Packard acquired EEsof in 1993, which became part of the Agilent spin-off in 1999, Agilent, became the owner of the Touchstone format. This text format that could be read by the TOUCHSTONE software, was referred to as a Touchstone format. By 1987, they incorporated an interface to communicate directly to the HP8510 and bring measured data into their TOUCHSTONE simulator environment in a text format. Their first product was called TOUCHSTONE which later evolved into Libra. Suddenly S-parameters were flooding out of the instrument.Īt the same time EEsof was started by Charles Abronson and Bill Childs to develop high frequency circuit simulation tools. The next year, the HP8510A was introduced, a single rack VNA system that could provide S-parameter measurements from 45 MHz to 26.5 GHz in one sweep. ![]() ![]() It could fit on a lab bench, though a very sturdy one. It revolutionized how return loss was measured and could automatically plot a Smith Chart.īy 1984, this evolved into the HP8409B Network Analyzer, shown in Figure 1. This was a 2-cabinet system with an HP8410 network analyzer and HP2001A computer with a CRT screen, teletype, 32k memory and a 5 MB disk drive with paper tape reader and puncher. The first automated network analyzer was the Hewlett Packard HP8410A, introduced in 1968. Now is the time to provide your input on what you would like to see. ![]() If you use or create S-parameters for signal integrity applications, you use the Touchstone format to store your data.
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