Bandgap circuit
AssigneeWinbond Electronics Corp.
InventorKai-Hsu Cheng
Life of this patent
Estimating the term…
Abstract
A bandgap circuit includes a current mirror circuit, a compensation circuit, and a startup circuit. The current mirror circuit includes a first transistor pair with control terminals coupled to each other at a first node. The first transistor pair is configured to generate a first voltage with a negative temperature coefficient at the first node. The compensation circuit is used to generate a second voltage with a positive temperature coefficient to the first node. The startup circuit is used to provide the first voltage to the first node when the bandgap circuit is initiated.
Claims19
A bandgap circuit, comprising:
- a current mirror circuit, having a first transistor pair with control terminals coupled to each other at a first node, wherein the first transistor pair is configured to generate a first voltage with a negative temperature coefficient at the first node;
- a compensation circuit, used to generate a second voltage with a positive temperature coefficient to the first node;
- and
- a startup circuit, used to initiate the bandgap circuit and provide a first voltage to the first node.
A bandgap circuit, comprising:
- a current mirror circuit, having a diode pair, wherein the diode pair is configured to generate a first voltage with a negative temperature coefficient at a first node;
- a compensation circuit, used to generate a second voltage difference with a positive temperature coefficient to the first node;
- and
- a startup circuit, used to provide a first voltage to the first node when the bandgap circuit is initiated.
A bandgap circuit, comprising:
- a Widlar current mirror circuit, configured to generate a first voltage with a positive temperature coefficient, wherein the Widlar current mirror circuit generates a second voltage with a negative temperature coefficient by a first node coupled between a first resistor and a first transistor;
- a compensation circuit, used to generate a first current according to the first voltage;
- and
- a startup circuit, used to provide a first voltage to the compensation circuit to initiate the compensation circuit when the bandgap circuit is initiated.
Dependencies are inferred from the claim text.