US 2003/0201822 A1 · Fast start-up low-voltage bandgap voltage reference circuit

Abstract

A fast start-up low-voltage bandgap voltage reference circuit is proposed. The bandgap voltage reference circuit comprises: a first current generator, which is implemented by a self-bias unit and a current mirror for generating a first reference current with positive temperature coefficient; a second current generator, which is connected to a point with negative temperature coefficient in the first current generator to generate a second reference current with negative temperature coefficient; and a resister for converting the first reference current and the second reference current into a low-voltage bandgap voltage independent of temperature. Because the bandgap voltage reference circuit of the invention uses the resistor to convert the first reference current and the second reference current into voltage, the circuit can provide low-voltage bandgap voltage.

Claims15

Dependent claims

A bandgap voltage reference circuit, said circuit comprising:

a first current generator for generating a first reference current with positive temperature coefficient, said first current generator having a self-bias circuit, a first current mirror and a node which outputs a node voltage with negative temperature coefficient;
a second current generator having a voltage-controlled current source and a second current mirror, said voltage-controlled current source receiving said node voltage for generating a second reference current with negative temperature coefficient according to the node voltage;
and
an output resister, said output resistor accepting both the first reference current and the second reference current for outputting a bandgap voltage according to the first reference current and the second reference current.

1 more element

A circuit for generating a bandgap voltage, said circuit comprising:

a bandgap reference circuit for generating a first reference current with positive temperature coefficient, wherein the bandgap reference circuit includes a node for outputting a node voltage with negative temperature coefficient;
a voltage-controlled current source coupled to the node for producing a second reference current with negative temperature coefficient according the node voltage;
a current mirror coupled to the voltage-controlled current source for outputting the second reference current;
and
an output resister, said output resistor accepting both the first reference current and the second reference current for outputting the bandgap voltage according to the first and second reference currents.

2 more elements

Dependencies are inferred from the claim text.

Fast start-up low-voltage bandgap voltage reference circuit

Life of this patent

Fast start-up low-voltage bandgap voltage reference circuit

Life of this patent

Abstract

Claims15