Patent ID: 8536853

Claim:
A low power voltage regulator for supplying operating voltage to circuits required to maintain data and/or be operational during an integrated circuit device low power sleep mode, comprising: an amplifier having a non-inverting input, an inverting input, and an output; an N-channel field effect transistor (FET) having a source, a drain and a gate, wherein the drain of the N-channel FET is connected to a supply voltage source, and the gate of the N-channel FET is connected to the output of the amplifier; the non-inverting input of the amplifier is connected to a voltage approximately equal to a threshold voltage of the N-channel FET; a constant current source connected to a supply voltage common; a first P-channel FET having a source, a drain and a gate, wherein the drain and gate of the first P-channel FET are connected to the inverting input of the amplifier and the constant current source, and the source of the first P-channel FET is connected to the source of the N-channel FET; the amplifier, the N-channel FET, the first P-channel FET, and the constant current source comprise a low power secondary voltage regulator having an output, wherein the output is the connected sources of the first P-channel FET and the N-channel FET; and a maintained voltage core logic of an integrated circuit device connected to the output of the low power secondary voltage regulator.