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How to Measure 5 ns Rise / Fall Time on RF Pulsed Power Amplifier

Application Notes

In a pulsed radar system, one of the key transmitter-side components is the pulse power amplifier. Power amplifiers, whether solid state or vacuum tube, used in pulse radar systems need to output up to several kilowatts of power. Since WWII, engineers have been trying to perfect the design of pulsed power amplifiers to support wider bandwidth, thus allowing more data to be transferred, and to increase efficiency to enhance power consumption efficiency. One of the key measurements required for evaluating a wide bandwidth (greater than 100 MHz) using a pulse power amplifier is pulse rise time. Currently there are several instruments capable of measuring the rise time of the RF pulsed power amplifier, including a high sampling oscilloscope with a diode detector, an RF peak power meter, and an RF spectrum analyzer using zero-span mode. This application note focuses on a new measurement instrument: the Keysight Technologies 8990B peak power analyzer (PPA). It is the highest performance peak power meter in the power meter test and measurement industry. The 8990B is easy-to-use and provides highly accurate fast rise/fall times measurements.

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