Using digital chips as linear devices is best left to using them as oscillators
in microprocessors. You will find that almost every micro has a single gate set
up for exactly this use. trying to use them as general purpose linear devices is
almost bound to produce tears of frustration as there is no temperature
stabilization in the linear region, and no characterization of gain. It may even
be that various characteristics of the active devices are chosen limit the
ability to operate in the linear region, except where the gate is being built in
as an oscillator.

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