NOISE SIMULATION OF OPERATIONNEL AMPLIFICATEUR

Discussion in 'Cadence' started by lahianihajer, Nov 6, 2007.

  1. lahianihajer

    lahianihajer Guest

    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.
     
    lahianihajer, Nov 6, 2007
    #1
  2. lahianihajer

    Andrew Beckett Guest

    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, Nov 15, 2007
    #2
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