Patent ID: 6605987
Filing Date: 2003-08-12
Classification: G05F

Abstract:
A circuit for generating a temperature stabilized reference voltage on a semiconductor chip, in which two partial currents with opposite temperature dependence are generated, superimposed on each other and converted into the reference voltage supplied at an output of the circuit, the circuit comprising:a common node; a first circuit formed as an asymmetric differential amplifier for generating a first partial current based on the asymmetric characteristic of said asymmetric differential amplifier, said asymmetric differential amplifier having two lateral bipolar transistors and an electrical resistance element, said two lateral bipolar transistors including a first lateral bipolar transistor and a second lateral bipolar transistor having a greater active area than first lateral bipolar transistor, each of said two lateral bipolar transistors having an emitter terminal, a base terminal and a collector terminal, the emitter terminal of said first lateral bipolar transistor being electrically connected to said common node, and the emitter terminal of said second lateral bipolar transistor being connected to said common node through said electrical resistance element; a second circuit for generating a second partial current having opposite temperature dependence of said first partial current, said second circuit being connected to said common node; and a balanced circuit connected to said common node for converting said first and second partial currents into the reference voltage, said balanced circuit having a first branch for feeding said common node with a current and a second branch having an output resistor connected to the output for converting current flowing through said second branch into the reference voltage.