US 7,679,352 B2Granted

Bandgap reference circuits

AssigneeFaraday Technology Corp.

InventorsYan-Hua Peng, Uei-Shan Uang

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Abstract

A bandgap reference circuit comprises: a current generator for generating an output current, the current generator comprising a first reference unit and a plurality of second reference units arranged in parallel, where the current generator is capable of determining the magnitude of the output current according to the reference units; a first resistor, coupled between a first terminal of the first reference unit and a node, for transmitting a first current; a second resistor, coupled to the node and a first terminal of each second reference unit, for transmitting a second current; a third resistor, coupled between the node and an output terminal of the bandgap reference circuit, for transmitting a third current; and a current-to-voltage converter, coupled to the third resistor, for generating a bandgap voltage according to the output current and the third current.

Claims20

Dependent claims

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

a current generator for generating an output current, the current generator comprising a plurality of reference units comprising a first reference unit and a plurality of second reference units arranged in parallel, the current generator being capable of determining the magnitude of the output current according to the plurality of reference units, wherein a first portion of the output current is a current having a negative temperature coefficient, and a second portion of the output current is a current having a positive temperature coefficient;
a first resistor, coupled between a first terminal of the first reference unit and a node, for transmitting a first current;
a second resistor, coupled to the node and a first terminal of each second reference unit, for transmitting a second current;
a third resistor, coupled between the node and an output terminal of the bandgap reference circuit, for transmitting a third current, wherein the magnitude of the third current is equal to the sum of the magnitude of the first current and the magnitude of the second current;
and
a current-to-voltage converter, coupled to the third resistor, for generating the bandgap voltage according to the output current and the third current.

3 more elements

Dependencies are inferred from the claim text.