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US 2026/0287640 A1Published application
Current sensing circuit and method for sensing a source drain current of a switch transistor
AssigneeInfineon Technologies Austria AG
InventorsAbhishek JAIN, Suraj Somashekara KUMAR, Ramesh KARPUR GOPINATHAN
Life of this patent
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Abstract
A sensing circuit for sensing a source drain current through a switch transistor, comprising an output branch for superposing output currents of a first amplifier and a second amplifier and measuring the superposed output current.
Claims16
A sensing circuit for sensing a source-drain current through a switch transistor, the sensing circuit comprising:
- a first supply connected to a first input terminal of a first operational amplifier and configured to be connected to a source terminal of the switch transistor via a first transistor circuit;
- a second supply connected to a first input terminal of a second operational amplifier and configured to be connected to the source terminal of the switch transistor via a second transistor circuit;
- a third supply configured to be connected to a drain terminal of the switch transistor via a sense transistor, whereby a gate of the sense transistor is configured to be connected to a gate terminal of the switch transistor;
- a first voltage adjustment branch setting a second terminal of the first amplifier to a first Input voltage based on a voltage of the third supply and shifted by an offset;
- a second voltage adjustment branch setting a second terminal of the second amplifier to the offset;
- and
- an output branch for superposing output currents of the first amplifier and the second amplifier and measuring the superposed output current.
4 more elements
A method for sensing a source-drain current through a switch transistor, comprising:
- providing a first supply connected to a first input terminal of a first operational amplifier and connecting the first supply to a source terminal of the switch transistor via a first transistor circuit;
- providing a second supply connected to a first input terminal of a second operational amplifier and connecting the second supply the source terminal of the switch transistor via a second transistor circuit;
- providing a third supply and connecting the third supply to a drain terminal of the switch transistor via a sense transistor;
- providing a connection a gate terminal of the sense transistor with a gate terminal of switch transistor;
- setting a second terminal of the first amplifier to a first input voltage based on a voltage of the third supply and shifted by an offset;
- setting a second terminal of the second amplifier to the offset;
- superposing the output current of the first amplifier and the second amplifier;
- and
- calculating the source-drain current through the switch based on the superposed output current and a resistance multiplicity of the transistor circuits with respect to a resistance of the switch transistor.
6 more elements
A sensing circuit comprising:
- a first voltage adjustment circuit operative to set a terminal of a first amplifier to a first input voltage based on a received voltage, the received voltage being shifted by an offset value, the first amplifier outputting a first output current;
- a second voltage adjustment circuit operative to set a terminal of a second amplifier to the offset value, the second amplifier outputting a second output current;
- and
- an output circuit operative to:
- i) superimpose the first output current and the second output current to produce a superimposed output current, and ii) measure the superposed output current.
2 more elements
Dependencies are inferred from the claim text.