A differential comparator is provided for controlling two switches (40) and (42) to switch two supplies (10) and (12), respectively, to a common output node (22). The decision/control circuit (44) outputs two control signals (46) and (48), the logic state thereof being a function of whether supply (10)...http://www.google.de/patents/US5187396?utm_source=gb-gplus-sharePatent US5187396 - Differential comparator powered from signal input terminals for use in power switching applications
