NOISE SIMULATION OF OPERATIONNEL AMPLIFICATEUR

[lahianihajer@gmail.com]

Hi all, I would like to ask how simulate the noise of an operationnel
amplificateur with CADENCE ? Exactely, what is the source of noise
which should be added in the input of amplificateur ?

Thank you for all your efforts.

 

[Andrew Beckett]

On Tue, 06 Nov 2007 09:05:14 -0000, "lahianihajer@gmail.com"
<lahianihajer@gmail.com> wrote:

Hi all, I would like to ask how simulate the noise of an operationnel
amplificateur with CADENCE ? Exactely, what is the source of noise
which should be added in the input of amplificateur ?

Thank you for all your efforts.

Not sure why you posted the same question 3 times, but here goes...

Well, you didn't say which Cadence tools you're using, but if using the Analog
Design Environment with spectre as the simulator, simply use the "noise"
analysis, and sweep the frequency as you want, and tell the noise analysis on
the form where the output of the circuit is.

You don't have to have a source unless you want to introduce an additional
noise source over and above the devic e noise that you'll get from the
analysis as it is. If you want to introduce noise, you could use a "port" (from
analogLib) which has an inbuilt impedance, and so generates thermal noise. Or
you could specify a noise file on your source (e.g. vsource from analogLib)
which allows you to simulate with a file of noise versus frequency values
(see "spectre -h vsource" for a little more detail on this).

Regards,

Andrew.
--
Andrew Beckett
Senior Solution Architect
Cadence Design Systems, UK.