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. One is the need to match the different impedances of the interconnected blocks. ![]() When dealing with the practical implementation of RF applications, there are always some nightmarish tasks. Tried and true, the Smith chart is still the basic tool for determining transmission-line impedances. A sample matching network of the MAX2472 is designed at 900MHz using graphical methods. Examples are shown plotting reflection coefficients, impedances and admittances. ![]() Tutorial on RF impedance matching using the Smith chart.
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