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

Claim 15:
16. A measurement system comprising a measurement instrument, the measurement instrument comprising at least one signal input, a measurement circuit, a control circuit, and an analysis circuit,
wherein the at least one signal input is configured to receive an output signal of a device under test,
wherein the measurement circuit is configured to determine measurement IQ data based on the output signal of the device under test,
wherein the control circuit is configured to set a magnitude threshold,
wherein the analysis circuit is configured to determine critical samples of reference IQ data for which a magnitude of a reference signal is smaller than the magnitude threshold,
wherein the analysis circuit is configured to discard 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
wherein the analysis circuit is configured to determine 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.