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Current sensor

  • US 10,459,474 B1
  • Filed: 10/28/2018
  • Issued: 10/29/2019
  • Est. Priority Date: 09/05/2018
  • Status: Active Grant
First Claim
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1. A current sensor, comprising:

  • a current sensing resistor having a first terminal and a second terminal respectively coupled to a first input terminal and a second input terminal of the current sensor;

    a first transistor having a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first transistor is coupled to the first input terminal of the current sensor, and the second terminal of the first transistor is coupled to an output terminal of the current sensor;

    a second transistor having a first terminal, a second terminal and a control terminal, wherein the first terminal of the second transistor is coupled to the second input terminal of the current sensor;

    a bias voltage generating circuit, coupled to the control terminal of the first transistor to provide a first bias voltage, and coupled to the control terminal of the second transistor to provide a second bias voltage, wherein the first bias voltage and the second bias voltage depend on a voltage of the first input terminal of the current sensor or a voltage of the second input terminal of the current sensor, wherein the bias voltage generating circuit comprises a third transistor, a current source, a first resistor and a second resistor, a first terminal of the third transistor is coupled to the first input terminal of the current sensor or the second input terminal of the current sensor, a second terminal of the third transistor is coupled to a control terminal of the third transistor, the current source is coupled to the second terminal of the third transistor, a first terminal of the first resistor is coupled to the control terminal of the first transistor to provide the first bias voltage, a second terminal of the first resistor is coupled to the control terminal of the third transistor, a first terminal of the second resistor is coupled to the control terminal of the second transistor to provide the second bias voltage, and a second terminal of the second resistor is coupled to the control terminal of the third transistor; and

    a current mirror having a first current terminal and a second current terminal, wherein the first current terminal of the current mirror is coupled to the second terminal of the second transistor, and the second current terminal of the current mirror is coupled to the second terminal of the first transistor.

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