Patent ID: 11874312
Assignee: ROHDE & SCHWARZ GMBH & CO. KG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A phase noise measurement method of measuring phase noise of a device under test, the phase noise measurement method comprising the steps of:
providing reference IQ data, wherein the reference IQ data is associated with a reference signal;
generating, by a signal generator circuit, the reference signal based on the reference IQ data;
processing, by the device under test, the reference signal, thereby obtaining an output signal of the device under test, wherein the output signal comprises at least one repeating waveform;
determining, by a measurement circuit, measurement IQ data based on the output signal of the device under test;
performing, by the measurement circuit, a sample-wise coherent average of multiple repetitions of the at least one repeating waveform, thereby obtaining averaged measurement IQ data;
setting, by a control circuit, a magnitude threshold;
determining, by an analysis circuit, critical samples of the averaged measurement IQ data having a magnitude smaller than the magnitude threshold;
discarding the critical samples of the averaged measurement IQ data and corresponding critical samples of the measurement IQ data, thereby obtaining modified averaged measurement IQ data and modified measurement IQ data; and
determining, by the analysis circuit, a phase noise spectrum of the output signal of the device under test based on the modified averaged measurement IQ data and based on the modified measurement IQ data.