Patent ID: 8072259

Claim:
A circuit comprising: a plurality of N-channel field effect transistor Proportional To Absolute Temperature (N-PTAT) cells that are connected to a first supply voltage; a plurality of P-channel field effect transistor Proportional To Absolute Temperature (P-PTAT) cells that are connected to a second supply voltage; a plurality of P-channel field effect transistor current sources, a respective one of which is connected to a respective one of the N-PTAT cells; a plurality of N-channel field effect transistor current sources, a respective one of which is connected to a respective one of the P-PTAT cells; an additional N-channel field effect transistor current source that is connected to at least one of the plurality of N-channel field effect transistor current sources, but is not directly connected to the P-PTAT cells; and a coupling circuit that connects at least one of the N-PTAT cells to at least one of the P-PTAT cells; wherein a respective N-PTAT cell comprises a pair of N-channel field effect transistors having source and drain electrodes that are serially connected and gates that are connected to one another and to a source electrode of one of the N-channel field effect transistors; wherein a respective P-PTAT cell comprises a pair of P-channel field effect transistors having source and drain electrodes that are serially connected and gates that are connected to one another and to a source electrode of one of the P-channel field effect transistors; and wherein the coupling circuit comprises a field effect transistor having a gate that is connected to the source electrode of an N-channel field effect transistor of one of the N-PTAT cells, having a source that is connected between the serially connected pair of P-channel field effect transistors of one of the P-PTAT cells and having a drain that is connected to the additional N-channel field effect transistor current source.