Smith chart software3/16/2024 ![]() ![]() ![]() The chart is named for Phillip Smith, an engineer at Bell Telephone Laboratories, who devised and refined it between 19 while working on understanding transmission lines and standing waves at what was then considered “high frequencies” of up to 1 MHz (called megacycles per second in those days). These graphs, called Smith charts, are very different than anything seen in algebra or statistics classes, no doubt of that.įigure 1: Many RF component data sheets include Smith charts showing the values of key parameters at different operating frequencies, such as these for the Maxim MAX2472 VCO buffer amplifier at 600, 900, 1900, and 2400 MHz. Novice designers doing RF design and trying to make a direct connection between two components-for example, from a voltage-controlled oscillator (VCO) to a mixer-have undoubtedly come across strange, circular graphs on component data sheets, such as these for the Maxim Integrated MAX2472, a 500-to-2500 megahertz (MHz) VCO buffer amplifier (Figure 1). ![]()
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