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The development of a novel technique for measuring HPA (High Power Amplifiers) AM (Amplitude Modulation) and PM (Phase Modulation) noise is reported. The new method utilizes a dual channel microwave downconverter and a 16-bit high-speed digitizer to directly sample the IF allowing digital demodulation of AM and PM noise simultaneously. A prototype AM/PM noise measurement system has been built with...
This paper is about using sampling oscilloscopes to perform Vector Network Analysis measurements. This paper discusses algorithms and hardware required to make vector network measurements and then compares the measurements on a simple low pass filter to measurements taken by a vector network analyzer. Oscilloscopes and digitizers have been steadily increasing in bandwidth. At the same time Interchangeable...
Analysis of digitized waveforms requires an understanding of the limitations of the acquisition hardware, an understanding of how digital sampling interacts with the waveform shape, and an understanding of how the desired measurements are influenced by the sampling operation. By paying attention to these considerations and following some general guidelines an acquisition system can be tuned to get...
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