Patent ID: 6346849
Filing Date: 2002-02-12
Classification: G05F

Abstract:
A band gap reference stage comprising:a pair of transistors each having a conduction terminal and a control terminal, the control terminals of said transistors being connected together; a circuit for causing substantially identical currents to pass through each of said pair of transistors comprising first and second resistors connected in series to a voltage reference, the conduction terminal of one of said pair of transistors being coupled to the voltage reference by said first and second resistors, the conduction terminal of the other of said pair of transistors being coupled to the voltage reference by said second resistor; the ratio of said first resistor to said second resistor-defining a reference voltage substantially unchanged by a temperature variation on the control terminals of said pair of transistors, said first and second resistors each comprising a first integrated resistor and a second integrated resistor, said first integrated resistors having a temperature coefficient greater than a temperature coefficient of a thermal voltage, and said second integrated resistors being of a different type than said first integrated resistors and having a temperature coefficient smaller than the temperature coefficient of the thermal voltage.