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MOS current sense circuit

  • US 6,479,975 B1
  • Filed: 10/16/2001
  • Issued: 11/12/2002
  • Est. Priority Date: 09/26/2001
  • Status: Expired due to Term
First Claim
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1. A current sense circuit comprising:

  • a first MOS transistor having a gate, a drain, and a source wherein said gate is coupled to a control signal and wherein said drain is coupled to a load such that a load current flows through said first MOS transistor when said control signal is ON;

    a second MOS transistor having a gate, a drain, and a source wherein said gate is coupled to said control signal, wherein said drain is coupled to a constant current source such that said constant current flows through said second MOS transistor when said control signal is ON, wherein said source is coupled to said source of said first MOS transistor, and wherein said first and second MOS transistors are operating in the linear region when said control signal is ON; and

    a means to compare said first MOS transistor drain voltage and said second MOS transistor drain voltage.

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