To add Stability Circles to the first Smith Chart (top-left), the user needs to have. The Stability Circle represents the area of the Smith Chart in which the devise can become unstable. If you want to email me directly, I would be willing to see if I can get another copy of this text at a reasonable price and send you a copy.Category: FDCS Noise Measurements / Data Explorer So you would need to be able to read in the file to plot noise figure circles.
If I recall correctly, there is a closed form equation for calculating the radius of a noise figure circle, however the center point of the circle has be measured on a test set and is available in the s2p file provided by the OEM. Chapter 3 covers stability and gain circles and is filled with worked examples and charts that can be used to verify your work.
The reference I recommend is Microwave Transistor Amplifiers, Analysis and Design by Guillermo Gonzalez. Standard formulas are published that will provide the circle center and radius from the s, z, h, or y parameters. With this capability anyone could compute the circle center and radius using a spread sheet and then plot them, or you could add the subroutines to calculate the circle center and radius into WinSmith. I would start by just having a general purpose subroutine that is capable of plotting a circle of arbitrary radius and arbitrary center on the smith chart. Adding gain, stability and noise figure circles is actually easy to do when compared to all the sophisticated capabilities already in WinSmith. When I discovered WinSmith, I realized I would never be able to add all the sophisticated features it contained, particular without using macros or add-ins, and put the effort aside. My motivations for the project were to improve my skills and fluency in working with Smith Charts, particularly focused on microwave transistor design work. This excel work sheet does not use any macros, just excel formulas, because it is using excel getting high resolution output comes along, see the attached PDF for an example. When I discovered WinSmith I was in the middle of developing an Excel worksheet that could perform Smith Chart calculations and was beginning to add gain and stability circles. Folks, I would be more than happy to help with this effort.
0 kommentar(er)
