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

Claim 0:
1. 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;
determining, by a measurement circuit, measurement IQ data based on the output signal of the device under test;
setting, by a control circuit, a magnitude threshold;
determining, by an analysis circuit, critical samples of the reference IQ data for which a magnitude of the reference signal is smaller than the magnitude threshold;
discarding the critical samples of the reference IQ data and corresponding critical samples of the measurement IQ data, thereby obtaining modified reference 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 reference IQ data and based on the modified measurement IQ data.