noise in switch cap circuit

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dejunwang

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hi, I have a question regarding noise in general. Say I have a cap of value 4C. then I have a total KT/C noise of KT/4C. Then if I use 4 identical caps of value C each and a switch in each branch, then the total noise is still KT/4C? It is quite hard to visualize as at the moment when the switches are open, each cap has a Vnoise equal to KT/C stored on the top plate. When you sum them up in power, wouldn't they become 4*KT/C?


I know this might be a silly question but I am really confused at the point.


thanks for the help.
 

I advise you read cha7 of razavi's book.
you will get clear on this issue
 

because the noise are power not voltage or current and also several sources may not be uncorrelated they are not added in the way that we think about them.
 

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