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Op Amp specification for conductor thermal noise measurement application

Other Parts Discussed in Thread: OPA211, OPA827, LM4562, OPA333, OPA188, OPA277

Dear Engineers,

I want to asking about Op Amp specification to realize thermal noise measurement on conductor.

What the most important Op Amp specification for that application?
What the specification for measure noise voltage and noise current is different?
Can you give me example the Op Amps type which are appropriate for that application?

Thanks,

Saaddin