Patent ID: 7276890

Claim:
A bandgap circuit comprising: first and second transistors that have gates that are connected and are driven by a common gate voltage, said first and second transistors having sizes that are proportional to the current flowing through said first and second transistors so that the voltages at the sources of said first and second transistors are substantially equal; a reference resistor connected to the source of said first transistor; a first reference transistor having an emitter that is connected to said resistor and a collector connected to ground; a second reference transistor having an emitter connected to said second transistor and a collector connected to ground; a resistor divider circuit connected to the base of said first reference transistor; a modulating transistor connected to said resistor divider circuit that modulates the base of said first reference transistor with a fraction of voltage difference between the base and emitter of said modulating transistor to substantially cancel the temperature coefficient of current flowing through said reference resistor.