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Noise Figure based on rmsnoise (Read 1694 times)

ezencir New Member Offline Posts: 3 Irvine, CA	Noise Figure based on rmsnoise Sep 27^th, 2006, 9:52am Hello All, NF equation says NF=10log10(Vn,out2/(A24kTRs)) where A is the voltage gain from source to output, and Rs is the source impedance. How can I get Vn,out**2 term from rmsNoise function of Cadence? In other words, what is the exact Analog Design Environment output expression to calculate NF? Thanks for the feedback.
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ACWWong

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Re: Noise Figure based on rmsnoise
Reply #1 - Sep 27^th, 2006, 11:53am

you should use the "add to outputs button" to get the expression under the results->direct plot-> main form of the ADE GUI.
So output squared rms noise is:
getData("out" ?result "noise")**2
likewise the noise figure is:
getData("NF" ?result "noise")

the use of the rmsNoise funtion integrated the noise over a certain bandwidth. Normally one plots NF(f) using Av(f) and vn(f) so the rmsNoise calculator function might not be that useful.

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