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Q&A Can the corner frequency of thermal noise change with change in source impedance?

The thermal noise of a resistance depends only on that resistance. However, there is always some parasitic capacitance. That capacitance against the resistance causes a low pass filter. So in a ...

posted 1y ago by Olin Lathrop‭

Answer
#1: Initial revision by user avatar Olin Lathrop‭ · 2023-08-28T16:13:50Z (about 1 year ago)
The thermal noise of a resistance depends only on that resistance.  However, there is always some parasitic capacitance.  That capacitance against the resistance causes a low pass filter.

So in a sense, yes, the frequency content of thermal noise does vary with resistance in the real world due to the inevitable parasitic capacitance.