Patent ID: 7960961

Claim:
A circuit comprising: a bandgap circuit configured to output a reference voltage; a first switchable current source coupled to the bandgap circuit and configured to inject a first current into the bandgap circuit to correct the output reference voltage of the bandgap circuit for one of hotter or colder temperatures; a second switchable current source coupled to the bandgap circuit and configured to remove a second current from the bandgap circuit to correct the output reference voltage of the bandgap circuit for the other of hotter or colder temperatures; a first transistor, wherein the first switchable current source is coupled to the first transistor and configured to inject the first current into the emitter of the first transistor; a second transistor, wherein the second switchable current source is coupled to the second transistor and configured to remove the second current from the emitter of the second transistor; and a resistance network including three trimmable resistors, wherein the resistance network is coupled to the first switchable current source, the second switchable current source, the collectors of the first and second transistors, and the bandgap voltage output node, and wherein the bandgap circuit is configured such that the three trimmable resistors are configured to select the voltages at which the first and second switchable current sources inject and remove current, respectively, into/from the bandgap circuit.