Patent ID: 6060871
Filing Date: 2000-05-09
Classification: G05F

Abstract:
A voltage regulator circuit comprising a differential amplifier powered from a supply line at a nominal voltage level by being coupled between the supply line and a return line, a reference device coupled to a first input of the differential amplifier for defining a desired output voltage on an output line coupled to an output of the differential amplifier, and a feedback coupling from the output line to a second input of the differential amplifier, characterised in that the differential amplifier is coupled to the return line by a varying current source which feeds a varying bias current to the differential amplifier, and the varying current source has control means coupled to the supply line for controlling the magnitude of the varying bias current in accordance with variations in the nominal voltage level on the supply line and so to provide a first-order compensation of the output voltage for these variations in the nominal voltage level, a second-order compensation being provided by the feedback coupling from the output line to the second input of the differential amplifier.