VCO Simulation (control voltage)

[faizalism]

Dear All,
I have a problem on VCO simulation. I tried to do dc sweep for my control voltage of VCO, but how to get output frequency to the respect of control voltage (dc sweep). There is any hspice code need to add.

Thanks in advance.

 

[timo67]

Hi faizalism
With DC sweep you wont get any result,
I advize you to perform a transient simulation
As input signal choose a pulse with adequate VMIN, VMAX, RISE TIME etc.
you must perform a slow simulation to be able to evaluate the output frequency vs input signal

 

[pthoppay]

Hi,

Which tool are you using?

If you are using Spectre-RF then choose PSS analysis and in the menu there is an option for DC sweep.

Prakash.

 

[faizalism]

FYI, I am using mentor graphic for simulation. Maybe I need to using transient simulation, check one by one frequency to the respect of control voltage of VCO. But it is tedious work.

Anyway thanks.

 

[selina_wch]

Hi,

My way is adding a PWL signal on control voltage. After transient simulation, output of VCO can be got.
I use CSCOPE to dispaly my simulation results. CSCOPE has the function of dispaly the signal frequency.

 

[jswei303]

hi
you can run .tran and sweep the control voltage.
And then use .meas to calculate the frequencies.
finally show the result within awaves with setting x-ray the "control voltage"