What is Pink Noise?
Pink noise sources encompass flicker (1/f) noise and popcorn noise. Flicker noise is linked to the conductive characteristics of electronic elements, with various theories attributing it to interface traps at oxide-semiconductor interfaces or fluctuations in mobility. The noise is influenced by material homogeneity, volume, current, and frequency. In contrast, popcorn noise, proportional to 1/f2, serves as an indicator of suboptimal semiconductor manufacturing. It is associated with distinctive recombination processes, manifesting as a series of low-frequency noise bursts. Popcorn noise, being uncommon, is not extensively discussed.
Flicker noise is directly proportional to current and inversely proportional to volume. Electronic devices, being three-dimensional structures, exhibit unique expressions and scaling factors for planar resistors and semiconductor junctions.