Measurement of RF AM signal based on broadband sampling oscilloscope

In this paper, a new traceable method for measuring RF AM signal is presented. The 50GHz broadband sampling oscilloscope which is the national pulse parameter reference is used to measure the RF AM signal. A waveform measurement system for radio frequency amplitude modulation signal is constructed. After correcting the time-based jitter error of the collected waveform, the phase, amplitude and frequency parameters of radio frequency amplitude modulation signal are accurately restored by the co-directional orthogonal method and the least square method. The experimental results show that the method of using broadband sampling oscilloscope to measure the RF amplitude modulation signal and digitizing demodulation signal has excellent results, which achieves the accurate recovery of waveform parameters, and provides a new idea for traceability measurement of time domain RF modulation signal.