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Johnson noise contribution by switches

Question asked by Raptrick on Oct 13, 2014
Latest reply on Oct 14, 2014 by Raptrick

Dear All,

 

     I'm working on low noise amplifiers and for diagnostics I want to place a switch in series with the source. For example if take 1kOhm Ron switch do I have to take 4nV/rtHz in account. Or is it the Johnson noise of 2/3 from 1kOhm. What happens with noise if Ron fluctuates with the on voltage of the switch (multiplicative noise??). Does any one got some idea about the contribution of 1/f noise (is there a relation with max supply voltage).

 

Does ADI provide these details in their spice models?

 

Patrick

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