Patent ID: 7724068
Filing Date: 2010-05-25
Classification: G01K,G05F

Abstract:
1. An integrated circuit including: a bandgap reference circuit for generating a bandgap reference voltage and a temperature dependent voltage that varies in proportion to an ambient temperature of said integrated circuit and is referenced to said bandgap reference voltage; means for generating a temperature independent voltage that is independent of said ambient temperature of said integrated circuit and is referenced to said bandgap reference voltage, and a thermal sensor including means for comparing said temperature independent voltage and said temperature dependent voltage, and for generating a control signal based on a predetermined relationship between said temperature dependent voltage and said temperature independent reference voltage, wherein said thermal sensor comprises a thermal shutdown circuit including means for generating a thermal shutdown signal when said temperature dependent voltage is equal to said temperature independent voltage, wherein said thermal shutdown circuit comprises a first operational amplifier including an inverting input terminal connected to receive said temperature dependent voltage, and a non-inverting input terminal connected to receive said temperature independent voltage, and wherein said bandgap reference circuit comprises: