@User (and anyone else who may be interested) -- Here is a pointer to the paper on non-stationary flicker noise modeling that I mentioned in today's meetup:
A. G. Mahmutoglu and A. Demir, "Analysis of Low-Frequency Noise in Switched MOSFET Circuits: Revisited and Clarified," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 62, no. 4, pp. 929-937, April 2015, doi: 10.1109/TCSI.2015.2388834.