QuickSmith
QuickSmith - Free Interactive Open Source Smith chart for Web and Mobile for impedance matching - A Tutorial.
FAQ - quicksmith.online
To get to the Amplifier design window click on the Amplifier design menu or the "Chart icon". You will see two Smith charts. One for the source plane and another for the load plane.
Example: Large Signal Amplifier Design - quicksmith.online
Here Smith chart is used to design an input/output matching network for a RF power transistor. Problem: Design a network to match 2N5642 to deliver 20W between 50 ohms source and load at 175 MHz. Available supply voltage is 28 Volts.
Example: Transmission Line - quicksmith.online
Problem: Match an impedance of 10 - j15 to a 50 ohms line operating at 1000 MHz using transmission lines. Solution: First we assign 10 -j15 as the load termination. The frequency is set to 1000 MHz using the values menu in the schematic window.
Example: Inductance and Capacitance - quicksmith.online
The next task is to cancel or "tune out" the reactive part, which is done by adding a series inductor and increasing its value until the center of the chart is reached. The same is illustrated in the figure below with a blue trace.
Example: Large Signal Amplifier Design - quicksmith.online
The figure below shows the chart of the output circuit designed in a similar way as the input circuit. Frequency = 175 MHz. Load = 10.6- j7.3 ohms. L2 = 25.3 nh. C3 = 35 pf
Example: Wide Band Matching Network - quicksmith.online
One of the interesting aspects of wide band networks is the introduction of a new variable which is the term ination itself. In many practical situations the wide band "load" is a frequency dependent antenna.
Example: Impedance match
Example: Small Signal Amplifier Design Using S-Parameters-Impedance match. After finding the required input and output impedance our next task is to design a suitable network to provid e optimum match.