Correcting a system with imperfect correctors

How can an analog system correct its own error when correction components also drift?

Formülasyon

An analog signal is proposed to feed both processing and compensating paths. Because the correcting components also accumulate error, a finite practical cascade needs a stopping criterion.

Gerilim

Correcting a corrector repeats the original problem at another level.

Açık soru

What bound on residual error justifies stopping after a finite number of stages?