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I want to maka a CV plot of MOSFET capacitances. By using ac analysis this is easy. The problem is that i want to keep all dc sources because they are used to bias some other controlling part of circuit. In essense I want to do transient analysis and sweep a dc source at the same time. How is this possible through cadence?
How do you want to sweep the source? It's not that clear to me. You could make the source a vsource from analogLib which is a pulse source ramping the value up during the transient; in non-transient analyses it will use the dc value of this source (if supplied) or the time-zero value if the dc value is not supplied.
Or you could use the dynamic parameters capability of tran analysis to ramp up a variable (assigned as the value of the source) over time.
Or you could use parametric analysis to sweep the source separately from the time sweep (this is if you want the sweeps to be orthogonal).
As you can see I'm having to guess a little what your objective is.
In reply to Andrew Beckett:
Hi Andrew and thanks for your fast response!
I am using a vsin source and i want for a specific frequency to sweep its dc offset (or a dc voltage source in series).
In reply to soathana:
It's still not that clear to me...
Ok, probably it is Dynamic parameter option... I will work it out
OK, so are you expecting to have a vsin source with a specific frequency, and then have the DC voltage change during the transient simulation. Or do you want to several transient simulations with different DC offsets?
sorry for the many edits. I need a vsin source with a specific frequency, and then have the DC voltage change during the transient simulation. I tried with dynamic parameters a little bit, so I made a file for DC voltage with respect to time:
And I have tran 2m.
Is this the way to do it? Also is there a way to make it look more continuous. When I plot it with respect to time i get steps...
Also is there a way to plot versus the dynamic parameter instead of time?