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How to find rms input referred noise

Deepansh

Hello all,

I'm working on the design of an operational amplifier using Virtuoso 6.1.3. On doing a Noise Analysis and then Print->Noise Summary and then printing the  noise integrated  in a bandwidth of 50Hz to 8kHz, I got a statement in the Results Display Window which says 'Total input referred noise is 2.778e-06. Is this the rms value? I'm asking so because I need to find the rms value. If it is not, can someone please guide me on how to compute it?

Thank You

  • rmsNoise() will give you the integrated output noise in V/sqrt(Hz), and it will match what is shown on the noise summary (for output noise) if you set the units to V (and give the same integration range). If you want it in V^2/Hz, you can of course square the result.

    If you want to compute integrated input referred noise, you'd do:

    sqrt(integ(getData("in" ?result "noise")**2 1 1G))

    This is integrating between 1Hz and 1GHz in my case, and is also giving the result in V/sqrt(Hz). This will match what you see on the noise summary for input referred noise. So both the figures on the noise summary are RMS (if the units are in V rather than V^2, otherwise they are mean-square rather than root-mean-square).

    Regards,

    Andrew.

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