Patent ID: 7863876

Claim:
A reference voltage regulation circuit, comprising: an input switch for receiving one or more input voltage signals; a configurable amplifier coupled to the input switch, where the configurable amplifier may be configured to operate as an operational amplifier or as a comparator; a sample and hold circuit coupled to an output of the configurable amplifier; a voltage follower circuit coupled in feedback between the sample and hold circuit and the configurable amplifier for generating an adjusted output voltage at a circuit output, where the voltage follow circuit comprises a resistor divider circuit that is controlled by a calibration signal; and a counter circuit selectively coupled to the output of the configurable amplifier when configured as a comparator for generating the calibration signal in response to a clock signal, where the calibration signal represents a voltage error component that is removed from the circuit output when the calibration signal is applied to the resistor divider circuit during normal operational.