Voltage regulator generating a predetermined temperature-stable voltage
AssigneeSGS-Thomson Microelectronic S.A.
InventorPaolo Migliavacca
Life of this patent
Estimating the term…
Abstract
A voltage regulator for powering a load with a predetermined temperature-stable voltage, including an output stage, a terminal of which provides a current to the load, at a reference voltage; and a current source including a first branch formed of transistors and of a first resistor connected in series between two supply terminals, and a second branch formed of transistors connected in series between the two supply terminals, the output stage including a bipolar transistor connected as a current mirror with a bipolar transistor of the second branch, and the two transistors of the current source are crossed.
Claims37
A voltage regulator for powering a load with a predetermined temperature-stable voltage, including:
- an output stage, an output terminal of which provides a current to the load, at a reference voltage;
- and
- a current source including a first branch formed of a first MOS transistor, a first bipolar transistor, a second bipolar transistor and a first resistor connected in series between two supply terminals, and a second branch formed of a second MOS transistor, a third bipolar transistor and a fourth bipolar transistor connected in series between the two supply terminals, the output stage including a fifth bipolar transistor connected as a current mirror with the fourth bipolar transistor,
- wherein a base of the fourth bipolar transistor is connected between the first and second bipolar transistors, and a base of the second bipolar transistor is connected between the third and fourth bipolar transistors.
A circuit for generating a predetermined temperature-stable output voltage at an output terminal, wherein the output voltage generated is substantially independent of variations of a supply voltage, the circuit comprising:
- a current generating circuit including:
- a first branch formed by a plurality of transistors, including a first transistor, and a first resistor connected in series between a first supply terminal and a second supply terminal;
- a second branch formed by a plurality of transistors, including a second transistor, connected in series between the first supply terminal and the second supply terminal;
- and
- an output circuit including:
- the output terminal;
- and
- a third transistor connected between the output terminal and the second supply terminal,
- wherein a current node of the first transistor is connected to a control node of the second transistor, and a current node of the second transistor is connected to a control node of the first transistor, and
- wherein a control node of the third transistor is connected to the current node of the first transistor.
Dependencies are inferred from the claim text.