Patent ID: 7023262

Claim:
A negative voltage regulator for a semiconductor device comprising: a differential amplifier having a first input, a second input, and an output; an output transistor coupled to the output of the differential amplifier and arranged to generate a second negative voltage from a first negative voltage; a first voltage divider coupled to the first input of the differential amplifier; and a second voltage divider coupled to the second input of the differential amplifier, and adapted to drive the second input of the differential amplifier responsive to the second negative voltage; wherein the first voltage divider comprises: a first resistor coupled between a reference voltage and the first input of the differential amplifier, and a second resistor coupled between the first input of the differential amplifier and a power supply terminal; wherein the second voltage divider comprises: a third resistor coupled between the reference voltage and the second input of the differential amplifier, and a fourth resistor coupled between the second input of the differential amplifier and the second negative voltage; wherein the differential amplifier comprises: a differential pair of input transistors coupled to the first and second inputs of the differential amplifier, a current source coupled to the differential pair of input transistors, and a load coupled to the differential pair of input transistors; and wherein the output transistor has a second terminal coupled to the output of the differential amplifier.