Voltage/current conversion device and current source device
AssigneeThine Electronics, Inc.
InventorsHideyuki KOKATSU, Yusuke FUJITA
Life of this patent
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Abstract
The voltage-current conversion device 1A includes a current supply circuit 10A, a differential circuit 20A, a voltage booster 30, and a controller 40A. The current supply circuit 10A includes a first NMOS transistor 11, a second NMOS transistor 12, a first resistor 13, and a second resistor 14. The differential circuit 20A includes a first NPN transistor 21, a second NPN transistor 22, and a tail current source 23. The voltage booster 30 provides a potential equal to or higher than the power supply potential to each gate of the first NMOS transistor 11 and the second NMOS transistor 12.
Claims22
(canceled)
(canceled)
The voltage-current conversion device according to claim 19, further comprising:
- a third resistor provided between a source of the first NMOS transistor and a third node;
- and
- a current source provided between the third node and a second reference potential supply terminal,
- wherein the controller controls the potential provided by the voltage booster to each gate of the first NMOS transistor and the second NMOS transistor, based on a comparison between a current flowing through the first resistor or a potential of the first node, and a current flowing through the third resistor or a potential of the third node.
The voltage-current conversion device according to claim 19, further comprising:
- a third NMOS transistor having a drain connected to the first reference potential supply terminal;
- a third resistor provided between a source of the third NMOS transistor and a third node;
- and
- a current source provided between the third node and the second reference potential supply terminal,
- wherein the gates of the first NMOS transistor, the second NMOS transistor, and the third NMOS transistor are mutually connected, and
- wherein the controller controls the potential provided by the voltage booster to each gate of the first NMOS transistor, the second NMOS transistor, and the third NMOS transistor based on a comparison between the a current flowing through the first resistor or a potential of the first node and a current flowing through the third resistor or a potential of the third node.
The voltage-current conversion device according to claim 18,
- wherein the first NMOS transistor and the second NMOS transistor are both N-type LDMOS transistors.
The voltage-current conversion device according to claim 18,
- wherein the first NMOS transistor and the second NMOS transistor each have a triple-well structure, and a resistor is provided between each P-well of the first and second NMOS transistors and the first node.
The voltage-current conversion device according to claim 18,
- wherein the first NMOS transistor and the second NMOS transistor each have a triple-well structure, and a resistor is provided between each P-well of the first and second NMOS transistors and the source of the first NMOS transistor.
The voltage-current conversion device according to claim 18,
- wherein the first NMOS transistor and the second NMOS transistor each have a triple-well structure, and a voltage source is provided between each P-well of the first and second NMOS transistors and the first reference potential supply terminal.
The voltage-current conversion device according to claim 18,
- wherein the first NMOS transistor and the second NMOS transistor each have a triple-well structure, and a diode is provided between each P-well of the first and second NMOS transistors and the first reference potential supply terminal.
The voltage-current conversion device according to claim 17,
- wherein the differential circuit includes:
- a tail current source provided between the second reference potential supply terminal and an emitter of the first NPN transistor, and
- another tail current source provided between the second reference potential supply terminal and an emitter of the second NPN transistor.
The voltage-current conversion device according to claim 17, wherein a dummy load is connected to a second node, wherein the second NPN transistor has a collector connected to the second node.
The voltage-current conversion device according to claim 17, comprising a plurality of the current supply circuits, wherein a number of the current supply circuits connected to the first reference potential supply terminal is variable.
A voltage-current conversion device, comprising:
- a current supply circuit including:
- a first NPN transistor and a second NPN transistor, each having their respective collectors connected to a first reference potential supply terminal that supplies a first reference potential;
- a first resistor provided between an emitter of the first NPN transistor and a first node;
- and
- a second resistor provided between an emitter of the second NPN transistor and a second node;
- wherein bases of the first NPN transistor and the second NPN transistor are connected to each other;
- a differential circuit including:
- a third NPN transistor having a collector connected to the first node;
- a fourth NPN transistor having a collector connected to the second node;
- a tail current source provided between a second reference potential supply terminal, which supplies a second reference potential lower than the first reference potential, and emitters of both of the third NPN transistor and the fourth NPN transistor;
- a voltage booster configured to provide a potential equal to or higher than the first reference potential to each base of the first NPN transistor and the second NPN transistor;
- and
- a controller configured to control the potential provided by the voltage booster to each base of the first NPN transistor and the second NPN transistor based on a current flowing through the first resistor or a potential of the first node,
- wherein differential voltage signals are input to respective bases of the third NPN transistor and the fourth NPN transistor, and a current signal corresponding to these differential voltage signals is output from the first node.
(canceled)
A current source device, comprising:
- an NMOS transistor having a drain connected to a reference potential supply terminal that supplies a reference potential;
- a voltage booster configured to provide a potential equal to or higher than the reference potential to a gate of the NMOS transistor;
- and
- a controller configured to control the potential provided by the voltage booster to the gate of the NMOS transistor based on a current or a potential in a load circuit that receives a current output from a source of the NMOS transistor.
A voltage-current conversion device, comprising:
- a current supply circuit including a first NMOS transistor having a drain connected to a first reference potential supply terminal;
- a voltage booster having an output terminal connected to a gate of the first NMOS transistor;
- a first resistor provided downstream of the first NMOS transistor;
- an output terminal connected to a first node located downstream of the first resistor;
- a controller configured to control an output potential of the voltage booster based on a potential of the first node;
- and
- a differential circuit including a first NPN transistor disposed downstream of the first NMOS transistor, and a second NPN transistor disposed downstream of the first reference potential supply terminal,
- wherein differential input signals are respectively provided to a first base of the first NPN transistor and a second base of the second NPN transistor.
Dependencies are inferred from the claim text.