Low Frequency Noise in Randomly Stimulated Asymmetric Oscillators

TL;DR

This paper introduces a novel mechanism for low frequency noise in asymmetric oscillators caused by thermal excitation of higher frequency asymmetric modes, supported by models and experimental validation in magnetoresistive readers.

Contribution

It presents a new understanding of 1/f-like noise generation through asymmetric resonance modes stimulated by randomness, with a method for detection and experimental evidence.

Findings

Low frequency noise is linked to asymmetric resonance modes.

The proposed detection method successfully identifies the effect.

Experimental data confirms the presence of the noise mechanism in magnetoresistive readers.

Abstract

A new mechanism of low frequency (1/f-like) noise generation is described and analyzed. It is attributed to higher frequency asymmetric resonance modes, which are stimulated by a random factor, e.g. due to thermal excitation. One-dimensional models of bi-harmonic and non-linear asymmetric oscillators are presented to prove the concept, and a method of detecting the effect is developed. The method is then applied to experimental data, in order to show that the effect exists in magnetoresistive readers.