Patent ID: 7791320

Claim:
A voltage source for a semiconductor device, comprising: an output terminal of the voltage source; a standby regulator coupled to the output terminal and configured to determine whether a voltage on the output terminal reaches a low threshold value, wherein the standby regulator includes; a divided-voltage node coupled to the output terminal; a comparator coupled to the divided-voltage node at a first comparator input and a reference voltage at a second comparator input; a short-pulse generator coupled to an output of the comparator; and a first metal-oxide-semiconductor (MOS) transistor, wherein an output of the short-pulse generator is coupled to a gate of the first MOS transistor, a source of the first MOS transistor is coupled to a power supply voltage, and a drain of the first MOS transistor is coupled to the divided-voltage node; and an active regulator coupled to the output terminal and configured to determine whether the voltage on the output terminal reaches a high threshold value, the activation of the standby regulator being independent of the active regulator.