Finding Voltage Sensitivity and Quiescent Frequency of VCO

This example shows how to find VCO metrics such as voltage sensitivity (Kvco) and quiescent frequency or free running frequency (Fo).

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

open_system('vcoCharacteristics.slx')

The testbench is set to measure the Kvco and Fo metric of the VCO in Measurement option. Range of control voltage (V) provided to the input of VCO is set to [1 10].

Run the model for 1.2e-3 s. Double click the VCO Testbench to open the Block Parameters dialog box. Click on the Plot measurement button.

From the simulation, the free running frequency is 2.5 GHz, and voltage sensitivity is 125 MHz/V.