Discussion
Which factor decides whether flicker noise matters in a given circuit?
Answer: A
Flicker noise rises as frequency falls, so it matters where the circuit must work down to very low frequencies, and is negligible at radio frequencies. That is why direct-coupled instrumentation amplifiers fight it while a radio front end can ignore it. Impedance level governs thermal noise voltage. Bandwidth scales thermal and shot noise. And temperature drives thermal noise, whereas flicker noise depends chiefly on the device's material and processing. Knowing which parameter each mechanism responds to is what lets a measurement identify the one present.
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