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Add thermal noise to input voltage source

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analogdesigngiga

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Hi
I am designing high speed cmos clocked comparator. I want to add manually thermal noise to the input voltage source.
we can do it in two ways, either as a noise file or as a frequency noise pairs ion vsource element. I generated a file by doing noise analysis to a simple resistor divider circuit, By referring this file in the comparator circuit at the input it is not showing any impact .

Help is appreciated

Thanks
satya
 

More info is appreciated: show this file and how you referred to it!
 

You could poor-boy it by attaching a rack of parallel
current sources that inject chaotic signals, and use
the transient analysis (eye diagram style, perhaps).
I have done this many times; tnoise, never.

It will give you application-realistic, observable info
but will not give you the quantitative noise figure/#.
Which you want, maybe defines the method to use.
 

You didn't mention a simulator, we can't know if methods like transient noise are available at all.
 

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