Patent ID: 7170336

Claim:
A low voltage bandgap reference circuit, comprising: a reference circuit generating a first reference voltage with a negative temperature coefficient at a first output and a second reference voltage with a positive temperature coefficient at a second output; a first amplifying circuit coupled to said first output of said reference circuit, said first amplifying circuit comprising a first and a second current source, said first current source coupled to a first resistive means, where said first and said second current sources generate currents directly proportional to said first reference voltage and the reciprocal of said first resistive means; a second amplifying circuit coupled to said second output of said reference circuit, said second amplifying circuit comprising a third and a fourth current source, said third current source coupled to a second resistive means, where said third and said fourth current sources generate currents directly proportional to said second reference voltage and the reciprocal of said second resistive means; and a summing circuit coupled to a junction of said second and fourth current source, said summing circuit summing the currents of said second and fourth current source through a third resistive means, thereby generating a temperature independent output reference voltage proportional to the magnitude of said third resistive means.