Patent ID: 7880534

Claim:
A reference circuit for providing both a precision voltage and a precision current, comprising: a bandgap voltage reference circuit outputting a bandgap voltage as the precision voltage at a first voltage output terminal and outputting a proportional to absolute temperature (PTAT) current at a current output terminal in response to a power supply; a positive temperature coefficient calibrating circuit connected to the first voltage output terminal and the current output terminal of the bandgap voltage reference circuit for generating a PTAT voltage at a second voltage output terminal in response to the bandgap voltage and the PTAT current; a threshold voltage superposing circuit connected to the second voltage output terminal of the positive temperature coefficient calibrating circuit for generating a first voltage at a third voltage output terminal in response to the PTAT voltage, wherein the first voltage is generated according to the PTAT voltage plus a threshold voltage; and a precision current generator connected to the third voltage output terminal of the threshold voltage superposing circuit for outputting a reference current as the precision current at a reference current output terminal in response to the first voltage.