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Systems and methods for high-sensitivity detection of input bias current

  • US 8,130,032 B1
  • Filed: 09/29/2010
  • Issued: 03/06/2012
  • Est. Priority Date: 09/29/2010
  • Status: Active Grant
First Claim
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1. An apparatus for measuring an input bias current in an operational amplifier, comprising:

  • a servo loop;

    a low-leakage amplifier connected to the servo loop;

    a receptacle for the operational amplifier, the receptacle being configured to couple the operational amplifier to the low-leakage amplifier and to the servo loop when the operational amplifier is mounted in the receptacle;

    wherein the servo loop is configured to generate—

    a first leakage current of the low-leakage amplifier without the operational amplifier mounted in the receptacle, anda second leakage current of the low-leakage amplifier coupled to the operational amplifier with the operational amplifier mounted in the receptacle, andwherein the input bias current of the operational amplifier is generated by subtracting the first leakage current from the second leakage current.

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