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Basic Question in Cadence

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santom

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Hi,
I developed a system simulation model for two integrators connected in series.I want to find out the voltage developed at some nodes.How should I go about finding it.Should I do a transient analysis or an AC analysis?

Right now I am having a test bench containing two symbols of that integrators connected in series and a power supply connected at the input.

PLease guide me.Also if possible please clear me the difference between transient and AC analysis.


Santom
 

santom said:
Hi,
I developed a system simulation model for two integrators connected in series.I want to find out the voltage developed at some nodes.How should I go about finding it.Should I do a transient analysis or an AC analysis?
Click to expand...
A DC analysis.
santom said:
Also if possible please clear me the difference between transient and AC analysis.
Santom
Click to expand...
Transient: time domain analysis. AC: frequency domain analysis.
erikl
 

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    santom

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Thanks to you for the quick reply.
So should I not use the transient analysis to find the node voltages or is there any way to do that?
 

santom said:
So should I not use the transient analysis to find the node voltages or is there any way to do that?
Click to expand...
Yes, I told you (see above) : DC simulation!
 

Dc does not have any relation to the amplitude. Amplitude settling is defined by the balance of energy over an oscillation cycle. Take a look here:

dx1=-x2-a*(x1^2+x2^2-1)*x1
dx2=+x1-a*(x1^2+x2^2-1)*x2

The second term in both lines define a damping depending on the amplitude

amp=sqrt(x1^2+x2^2)

If you look at the plane defined by x1 and x2 the orbits will move to the unit circle. From inside and from outside.

The relations in a circuit are less ideal but the principle is similar.
 

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