资料介绍
Impedance Matching and the Smith Chart The Fundamentals WIRELESS, RF, AND CABLE
Application Note 742: Mar 23, 2001
Impedance Matching and the Smith Chart: The Fundamentals
Tutorial on RF impedance matching using the Smith Chart. Examples are shown plotting reflection coefficients, impedances and admittances. A sample matching network is designed at 60 MHz using graphical methods. Tried and true, the Smith chart is still the basic tool for determining transmission-line impedances.
When dealing with the practical implementation of RF applications, there are always some nightmarish tasks. One is the need to match the different impedances of the interconnected blocks. Typically these include the antenna to the low-noise amplifier (LNA), power-amplifier output (RFOUT) to the antenna, and LNA/VCO output to mixer inputs. The matching task is requir