Calculating the load impedance and power consumption at high frequencies in RF circuits is a tedious task. This Design Idea describes a VI (virtual instrument) that provides an easy way to quickly and effectively measure these parameters. You can measure and display the power and impedance of various types of loads, such as resistive or series/parallel tank circuits, at any given frequency. Using National Instruments Lab View, you can easily modify the VI to accommodate any type of load having any complexity. The virtual RF generator comprises power-supply, amplifier, and load-select/measurement-display modules.
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