Patent ID: 11885839
Assignee: KEYSIGHT TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of making time domain measurements of a periodic radio frequency (RF) signal using a narrowband measurement instrument operating in a frequency domain, wherein the measurement instrument comprises a plurality of receivers for measuring pulses in a plurality of reconstructed periodic RF signals in a time domain, wherein the plurality of reconstructed periodic RF signals are displayable simultaneously in the time domain, enabling direct comparison of amplitudes over time, the method comprising:
receiving the periodic RF signal at a receiver of the plurality of receivers in the frequency domain, wherein an entire bandwidth of the periodic RF signal is wider than an available bandwidth of each receiver of the plurality of receivers;
determining a phase response of the receiver;
determining an amplitude response of the receiver;
measuring phases of spectral components of the periodic RF signal using the phase response of the receiver;
measuring amplitudes of the spectral components of the periodic RF signal using the amplitude response of the receiver;
determining a complex absolute signal from the periodic RF signal by combining the measured phases with the measured amplitudes, such that the complex absolute signal comprises the amplitudes and the phases of the spectral components of the periodic RF signal across the entire bandwidth of the periodic RF signal in the frequency domain;
reconstructing the periodic RF signal in a time domain by transforming the complex absolute signal from the frequency domain to the time domain;
detecting at least one characteristic of the periodic RF signal in the reconstructed periodic RF signal in the time domain; and
displaying the at least one detected characteristic on a display.