Figure 4. Excess noise at 3 G₀ converted into voltage noise power S_V as a function of bias.

The solid blue line is the best quadratic fit to the experimental data, while the dotted blue line is a systematic overestimate (see text) of the contribution of flicker noise at 1 G₀. Any flicker noise contribution at 3 G₀ is expected to be even smaller. Thus, flicker noise is unlikely to be a compatible explanation for the observed increase in noise as a function of V.