Patent ID: 7750728

Claim:
A reference voltage circuit comprising: a first amplifier having an inverting input, a non-inverting input and an output, a current biasing circuit with a first potential and a second potential, the current biasing circuit for providing first and second PTAT currents from the first potential to the second potential and a CTAT current also from the first potential to the second potential; the CTAT current being equal in value to the second PTAT current at a first predetermined temperature, a first load element associated with one of the inputs of the first amplifier and arranged for receiving the first PTAT current such that a PTAT voltage is developed across the first load element and is available from the output of the first amplifier at the first predetermined temperature, and a feedback load element coupled between one of the inputs and the output of the first amplifier for receiving the summation of the CTAT current and the second PTAT current; the resistance of the feedback load element being such that at a second predetermined temperature the voltage at the output of the first amplifier is substantially equal to the voltage at the output of the first amplifier at the first predetermined temperature.