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Self-trim and self-test of on-chip values

  • US 8,143,953 B2
  • Filed: 06/03/2009
  • Issued: 03/27/2012
  • Est. Priority Date: 05/18/2009
  • Status: Active Grant
First Claim
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1. A self-trim circuit, comprising:

  • a) a circuit under trim (CUT) producing an analog signal and trimmed by a digital self-trim circuit;

    b) a compare circuit to compare an output of the CUT to a reference signal;

    c) said digital self-trim circuit receives and stores digital trim data to trim the CUT used to produce said output comparable to the reference signal, and said digital self-trim circuit controls said CUT to produce said output to match the reference signal to within a least significant bit (LSB) of the digital trim data, after which said digital circuit creates an offset to the compare circuit to verify the CUT trimmed to a value of the reference signal within the LSB.

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