Patent ID: 6181196
Filing Date: 2001-01-30
Classification: G05F

Abstract:
An apparatus comprising a CMOS-process integrated circuit which includes a bandgap circuit, said bandgap circuit including:a differential portion devoid of NPN-type bipolar components and having bipolar first and second components, having an output, and having first and second inputs that are respectively coupled to said first and second components, said differential portion further having bipolar third and fourth components that are respectively coupled to said first and second inputs of said differential portion, said third and fourth components being operatively coupled to said first and second components to generate a differential voltage, said differential portion further having a current source that is responsive to said output;a bias portion devoid of NPN-type bipolar components and being operative to bias the differential portion;a base current compensation portion devoid of NPN-type bipolar components and configured to sink base current flowing out of the first bipolar component when the bandgap circuit is in an equilibrium state;a voltage multiplier portion devoid of NPN-type bipolar components and operatively responsive to the differential voltage to generate a bandgap voltage; anda diode portion devoid of NPN-type bipolar components and operatively coupled to the voltage multiplier portion, wherein the current source is operative to cause a current to flow through said voltage multiplier portion and said diode portion and thereby control the bandgap voltage.