Set Up VCO Testbench Model

Open the modelvcoPhaseNoiseAnalysis. The model consists of a VCO block and a VCO Testbench.

open_system('vcoPhaseNoiseAnalysis.slx')

VCO Specifications and Phase Noise Impairments

Double click the VCO block to open theBlock Parametersdialog box. In the配置tab, theVoltage Sensitivity (Hz/V)is set to125e6. In theImpairmenttab, check that theAdd phase noiseoption is enabled.Phase noise frequency offset (Hz)andPhase noise level (dBc/Hz)parameters represent a typical phase noise profile in a VCO.

Modify VCO Testbench According to VCO Specifications

Double click the VCO Testbench block to open theBlock Parametersdialog box. In theStimulustab,Control voltage (V)is set to4.

UseAutofill setup parametersbutton to confugure the testbench for phase noise measurement. Also, check that in theTarget Metrictab, thePhase noise frequency offset (Hz)andPhase noise level (dBc/Hz)parameters match the values set in the VCO block.

Plot Phase Noise Profile

Run the simulation for0.8ms, according to theRecommmended min. simulation stop time (s)in theBlock Parametersdialog box of VCO Testbench.

Once the simulation is complete, the phase noise profile is displayed on the icon of the VCO Testbench. The measured phase noise is comparable to target phase noise.

In theBlock Parametersdialog box of VCO, click thePlot measurementbutton to plot the phase noise profile of the VCO. Notice that the VCO operating frequency is3GHz, and that the measured and targeted phase noise profiles match.