Patent ID: 7113025

Claim:
A bandgap reference voltage generating circuit, comprising: a proportional to absolute temperature (PTAT) voltage generating means generating a PTAT voltage; a complementary to absolute temperature (CTAT) voltage generating means generating a CTAT voltage; a temperature coefficient determining means interconnecting said PTAT voltage generating means and said CTAT voltage generating means; wherein said CTAT voltage generating means comprises: an op-amp configured for being powered by a supply voltage, said op-amp having inverting and noninverting op-amp inputs and an op-amp output; a first CTAT voltage generating means generating a first CTAT voltage at said inverting op-amp input; and a second CTAT voltage generating means generating a second CTAT voltage at said noninverting op-amp input, said first and second CTAT voltages resulting from currents of a predetermined ratio in said first and second CTAT voltage generating means; and wherein said temperature coefficient determining means comprises: a first resistor electrically interconnecting said first CTAT voltage generating means and an intermediate node; a second resistor electrically interconnecting said second CTAT voltage generating means and said intermediate node; and a third resistor interconnecting said intermediate node and said PTAT voltage source.