current versus frequency plot in cadence

[riyaz.vlsi]

Hello, please tell me how to plot current versus frequency plot in cadence while performing ac analysis.

 

[erikl]

You can plot the current through every device. Or you could insert a 0Ω resistor and plot the current through it.

 

[LvW]

You can plot the current through every device. Or you could insert a 0Ω resistor and plot the current through it.

Zorro, I suppose you mean a zero voltage source, correct? My simulator doesn´t accept a 0 ohm resistor.

 

[riyaz.vlsi]

You can plot the current through every device. Or you could insert a 0Ω resistor and plot the current through it.

Thanks, the current at output terminal with 0Ω resistor plot the curve, but when i want to plot current gain (output current/input current) vs frequency curve it shows a problem, i am applying ac current source at input terminal. Is it possible to plot current vs frequency curve at input terminal itself with ac current source.

 

[LvW]

Is it possible to plot current vs frequency curve at input terminal itself with ac current source.

Why not? However, what do you expect? Is your current source frequency dependent?

 

[riyaz.vlsi]

Why not? However, what do you expect? Is your current source frequency dependent?

yes i am varying the frequency of ac input current source. pls tell me brief steps to plot current vs frequency at output as well as at input itself in cadence.

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You can plot the current through every device. Or you could insert a 0Ω resistor and plot the current through it.

Thanks, its working. Is this affect dc operating point or not

 

[LvW]

When I am asking "is your current source frequency dependent?" I mean, of course, if the VALUE of the current depends on frequency.
Normally, you have a straight line (as a function of frequency) - not too interesting.
But I do not understand your question.
If you are not able to find the proper command how to plot a voltage or a current - why you are using such a program at all?

 

[erikl]

... Thanks, its working. Is this affect dc operating point or not

No, in ac simulation, it doesn't change the DC operating point.

 

[erikl]

You can plot the current through every device. Or you could insert a 0Ω resistor and plot the current through it.

Zorro, I suppose you mean a zero voltage source, correct? My simulator doesn´t accept a 0 ohm resistor.

Hello Lutz,

in fact I'm not Zorro (or did you think of Sorry ? ;-)), nevertheless the simulators which I'm using accept 0Ω resistors. But of course a 0V voltage source or a 0A current source serve the same purpose.

 

[LvW]

Hello Lutz,
in fact I'm not Zorro (or did you think of Sorry ? ;-)),

I am really sorry - I don´t know what has happened in my brain. It seems I am getting older and older...(surprisingly?).

 

[erikl]

I am really sorry - I don´t know what has happened in my brain. It seems I am getting older and older...(surprisingly?).

You probably read back issues of Zorro or saw a Zorro movie before ;-)
Never mind. This happens to all of us. And human brain always was and is prone to error, isn't it?