Patent ID: 7994848

Claim:
A circuit for generating a reference voltage, said circuit comprising: a current reference circuit comprising a PTAT generator, wherein the PTAT generator is configured to generate a PTAT voltage and a bias voltage; a first transistor coupled with a first output of the current reference circuit, wherein said first transistor is operable to generate a bias current that is proportional to a reference current of said current reference circuit, wherein said reference current is proportional to a temperature measurement; a diode-connected transistor coupled with said first transistor, wherein the diode-connected transistor is sized to compensate for a temperature-based voltage variation; a second transistor coupled with said diode-connected transistor, wherein said reference voltage is generated at a drain of said diode-connected transistor, and wherein a negative temperature variation of the second transistor is at least partially cancelled by a positive temperature coefficient of the diode-connected transistor; and a voltage follower circuit configured to generate a bandgap reference voltage based on said reference voltage, wherein a transistor of the voltage follower circuit is biased by the bias voltage of the PTAT generator.