How to generate a dynamic frequency square waveform in HSPIE

[huanchou]

Dear all:

I would like to generate a square waveform with the ferquency changed from 99M to 100M among 15us in HSPICE environment.
But I have try many methods, I still can't generate the waveform.

Any one have the idea to generate the waveform?

 

[simonkuo]

Re: How to generate a dynamic frequency square waveform in H

Maybe you can try to design a VCO on your clock signal input, then change the
control voltage (Use the pwl function), the clock output frequency will be changed.
You also can try to design a VCO behavior model to speed up your simulation.

 

[huanchou]

Re: How to generate a dynamic frequency square waveform in H

Yes, it work. Thanks for your help.
I use the VCO to generate the pattern. It work very well.

 

[Hughes]

You may use PWL or E element (with VOL=) to generate the waveform.