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Envelope Simulation of a FM VCO.

Alli

Hi,

I'm having a VCO and trying to modulate the control voltage of the VCO and check the output spectrum.

The difference between the oscillator frequency and the modulation frequency is huge. Therefore, in order to make the simulations faster I tried to use the envelop simulation. As I understand and tested if the Fast env mode is off it would be really slow almost same as transient, to make the simulation faster I have to use the Fast env mode (level1 or level2), But it requires modulation source I/Q, though i don't have any I and Q channel. All I have it the control voltage of the VCO which is swept linearly between two values.

What I have to choose as the I/Q channel? (BTW, It requires both I and Q.)

If you have any hints to simulate FM VCO with envelop analysis please share it with me.

Thanks,

Ali

Parents

  • Hi Ali,

    What University and where are you located?  (Things are handled differently in the EU compared to the US).

    In the US, it's typically the department chairperson who is either the liason or knows who the liason is.   The university-Cadence liason can file a Case in Customer Support for you.  The university liason can also get you access to Cadence Online support so you can search relevant Articles, AppNotes, and documentation.

    Re:  Shooting Newton envlp

    You can use shooting Newton with the nport, provided you set the interpolation method=bbspice on the nport.   You need to be using a recent version of IC (approx 6.1.6 or later) and MMSIM (approx 13.1 or later) tools to have that option.   

     If simulating an oscillator, your only option is "classic" envlp with fast envlp=off

    Note that as Andrew mentioned, we would need to see your testcase to determine if envlp is even an option for your circuit.  

    best regards,

    Tawna

Reply

  • Hi Ali,

    What University and where are you located?  (Things are handled differently in the EU compared to the US).

    In the US, it's typically the department chairperson who is either the liason or knows who the liason is.   The university-Cadence liason can file a Case in Customer Support for you.  The university liason can also get you access to Cadence Online support so you can search relevant Articles, AppNotes, and documentation.

    Re:  Shooting Newton envlp

    You can use shooting Newton with the nport, provided you set the interpolation method=bbspice on the nport.   You need to be using a recent version of IC (approx 6.1.6 or later) and MMSIM (approx 13.1 or later) tools to have that option.   

     If simulating an oscillator, your only option is "classic" envlp with fast envlp=off

    Note that as Andrew mentioned, we would need to see your testcase to determine if envlp is even an option for your circuit.  

    best regards,

    Tawna

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