EDAboard.com | EDAboard.de | EDAboard.co.uk | WTWH Media

AC analysis

Ask a question - edaboard.com

elektroda.net NewsGroups Forum Index - Cadence - AC analysis

sykab
Guest

Mon Apr 28, 2008 3:08 pm   



Hi!

I want to do an ac analysis to a single-ended opamp.
I'm having some difficulty to decide how to do the test bench's and if
I should add a vsin signal to the circuit. How should I specify the
input signal?

Furthermore, Can anyone tell me what's "Y element"?

Thanks

S. Badel
Guest

Mon Apr 28, 2008 3:40 pm   



Quote:
I want to do an ac analysis to a single-ended opamp.
I'm having some difficulty to decide how to do the test bench's and if
I should add a vsin signal to the circuit. How should I specify the
input signal?

It doesn't matter which type of source you are using, as they all have AC parameters available.
Rather choose it according to the signal shape you want during transient simulation.

For AC, the simplest setting is to just set the AC magnitude to 1.

See 'spectre -h vsource' for a list of parameters (I'm assuming you're using spectre).

Quote:
Furthermore, Can anyone tell me what's "Y element"?

I guess it depends... could be an element with the shape of a Y. Or an element modeled with
Y-parameters (http://en.wikipedia.org/wiki/Admittance_parameters).



Stéphane

sykab
Guest

Mon Apr 28, 2008 6:54 pm   



On Apr 28, 3:40 pm, "S. Badel" <stephane.ba...@REMOVETHISepfl.ch>
wrote:
Quote:
I want to do an ac analysis to a single-ended opamp.
I'm having some difficulty to decide how to do the test bench's and if
I should add a vsin signal to the circuit. How should I specify the
input signal?

It doesn't matter which type of source you are using, as they all have AC parameters available.
Rather choose it according to the signal shape you want during transient simulation.

For AC, the simplest setting is to just set the AC magnitude to 1.

See 'spectre -h vsource' for a list of parameters (I'm assuming you're using spectre).

Furthermore, Can anyone tell me what's "Y element"?

I guess it depends... could be an element with the shape of a Y. Or an element modeled with
Y-parameters (http://en.wikipedia.org/wiki/Admittance_parameters).

Stéphane


At first, thanks for your reply.
"Rather choose it according to the signal shape you want during
transient simulation. "
Sorry, I didn't understand. Did you mean that if I want to put, in the
transient simulation a DC signal, I should at it in the AC simulation?
I don't know if it helps, but the opamp will have feedback (it will
make part of a current source composed by an opamp, a nmos and a
resistor).

Thanks

sykab
Guest

Mon Apr 28, 2008 7:12 pm   



On 28 Abr, 16:54, sykab <sara.cata...@gmail.com> wrote:
Quote:
On Apr 28, 3:40 pm, "S. Badel" <stephane.ba...@REMOVETHISepfl.ch
wrote:



I want to do an ac analysis to a single-ended opamp.
I'm having some difficulty to decide how to do the test bench's and if
I should add a vsin signal to the circuit. How should I specify the
input signal?

It doesn't matter which type of source you are using, as they all have AC parameters available.
Rather choose it according to the signal shape you want during transient simulation.

For AC, the simplest setting is to just set the AC magnitude to 1.

See 'spectre -h vsource' for a list of parameters (I'm assuming you're using spectre).

Furthermore, Can anyone tell me what's "Y element"?

I guess it depends... could be an element with the shape of a Y. Or an element modeled with
Y-parameters (http://en.wikipedia.org/wiki/Admittance_parameters).

Stéphane

At first, thanks for your reply.
"Rather choose it according to the signal shape you want during
transient simulation. "
Sorry, I didn't understand. Did you mean that if I want to put, in the
transient simulation a DC signal, I should add it in the AC simulation?
I don't know if it helps, but the opamp will have feedback (it will
make part of a current source composed by an opamp, a nmos and a
resistor).

Thanks


Riad KACED
Guest

Mon Apr 28, 2008 7:49 pm   



It means that you keep your analogLib/vdc device, just fill the 'Ac
Magnitude' field. Puting '1' is very handy because it makes your Gain
directly readable without any multiplication/division.

Riad.


Guest

Sun Sep 11, 2016 9:13 am   



On Monday, 28 April 2008 17:38:31 UTC+5:30, sykab wrote:
Quote:
Hi!

I want to do an ac analysis to a single-ended opamp.
I'm having some difficulty to decide how to do the test bench's and if
I should add a vsin signal to the circuit. How should I specify the
input signal?

Furthermore, Can anyone tell me what's "Y element"?

Thanks
in my system sykab not added


elektroda.net NewsGroups Forum Index - Cadence - AC analysis

Ask a question - edaboard.com

Arabic version Bulgarian version Catalan version Czech version Danish version German version Greek version English version Spanish version Finnish version French version Hindi version Croatian version Indonesian version Italian version Hebrew version Japanese version Korean version Lithuanian version Latvian version Dutch version Norwegian version Polish version Portuguese version Romanian version Russian version Slovak version Slovenian version Serbian version Swedish version Tagalog version Ukrainian version Vietnamese version Chinese version Turkish version
EDAboard.com map