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LOW OFFSET CURRENT SENSE AMPLIFIER

  • US 20180301174A1
  • Filed: 01/30/2018
  • Published: 10/18/2018
  • Est. Priority Date: 04/14/2017
  • Status: Active Grant
First Claim
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1. A current sense amplifier, comprising:

  • a sense resistor configured to conduct a current to be measured;

    first and second intermediate nodes;

    a chopper electrically coupling the first and second intermediate nodes to first and second nodes of the sense resistor;

    a current mirror having first and second branches electrically coupled to the first and second intermediate nodes;

    a differential amplifier having inputs coupled to the first and second intermediate nodes and configured to generate a first voltage signal when the voltage at the first intermediate node is greater than a voltage at the second intermediate node, and to generate a second voltage signal when the voltage at the second intermediate node is greater than the voltage of the first intermediate node;

    a first transistor configured to be controlled by the first voltage signal and having a first main current conducting node coupled to a first one of the first intermediate node; and

    a second transistor configured to be controlled by the second voltage signal and a first main current conducting node coupled to a second one of the first and second intermediate nodes.

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