Substrate bias generator arrangement - has dual generators for run=up of power and stable supply states

摘要

A first substrate bias circuit operates with the external supply voltage as its power and applies a first bias level. A second substrate bias circuit operates with the internal reduced supply as its power to apply a second bias level. A stable state registration device determines whether the internal supply is in a stable state or not. A selector chooses the first or second bias circuit in dependence on the registration device output. Pref. the registration device has a supply application register for the external supply. A control signal is produced, dependent on it, to output a signal to the selector. USE/ADVANTAGE - Memory circuit. No problems during switch-on.