Device for providing a current
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorXavier Branca
Life of this patent
Estimating the term…
Abstract
An embodiment device includes a first MOS transistor and a first resistor in series between first node and second nodes, the first resistor being connected to the second node; a second MOS transistor and a second resistor in series between the first and second nodes, the second resistor being connected to the second node and the gates of the first and second transistors being coupled to each other; an operational amplifier including a first terminal connected to a node of connection of the first resistor to the first transistor, a second terminal, and an output terminal coupled to the gate of the first transistor; and a circuit configured to supply a set point voltage to the second terminal of the amplifier.
Claims22
A device comprising:
- a first metal-oxide-semiconductor (MOS) transistor and a first resistor in series between a first node and a second node, the first resistor being connected to the second node;
- a second MOS transistor and a second resistor in series between the first node and the second node, the second resistor being connected to the second node, and a gate of the second MOS transistor being coupled to a gate of the first MOS transistor;
- an operational amplifier comprising:
- a first terminal connected to a node of connection of the first resistor to the first MOS transistor;
- a second terminal;
- and
- an output terminal coupled to the gate of the first MOS transistor;
- a first circuit configured to supply a set point voltage to the second terminal of the operational amplifier;
- and
- a first switch connected between the gate of the first MOS transistor and the gate of the second MOS transistor;
- and
- a second switch connected between the gate of the second MOS transistor and the second node.
An electronic system comprising:
- an integrated circuit, comprising:
- a first metal-oxide-semiconductor (MOS) transistor and a first resistor in series between a first node and a second node, wherein the first resistor is connected to the second node;
- a second MOS transistor and a second resistor in series between the first node and the second node, wherein the second resistor is connected to the second node, and a gate of the second MOS transistor is coupled to a gate of the first MOS transistor;
- an operational amplifier comprising:
- a first terminal connected to a node of connection of the first resistor to the first MOS transistor;
- a second terminal;
- an output terminal coupled to the gate of the first MOS transistor;
- and
- a first circuit configured to supply a set point voltage to the second terminal of the operational amplifier;
- and
- a switch connected between a third node and a fourth node;
- a laser source, external to the integrated circuit, comprising:
- a first terminal of the laser source connected to the second node;
- and
- a second terminal of the laser source connected to the third node;
- and
- a capacitor, external to the integrated circuit, connected between the gate of the first MOS transistor and the second node.
A device comprising:
- a first metal-oxide-semiconductor (MOS) transistor and a first resistor in series between a first node and a second node, the first resistor being connected to the second node;
- a second MOS transistor and a second resistor in series between the first node and the second node, the second resistor being connected to the second node, and a gate of the second MOS transistor being coupled to a gate of the first MOS transistor;
- an operational amplifier comprising:
- a first terminal connected to a node of connection of the first resistor to the first MOS transistor;
- a second terminal;
- and
- an output terminal coupled to the gate of the first MOS transistor;
- a first circuit configured to supply a set point voltage to the second terminal of the operational amplifier;
- and
- a switch connected between a third node and a fourth node, the second node being configured to be connected to a first terminal of a laser source and the third node being configured to be connected to a second terminal of the laser source.
Dependencies are inferred from the claim text.