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Method and apparatus for direct conversion receiver correcting direct current offset

  • US 9,948,484 B2
  • Filed: 01/02/2015
  • Issued: 04/17/2018
  • Est. Priority Date: 01/03/2014
  • Status: Active Grant
First Claim
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1. An apparatus for direct current (DC) offset calibration of a direct conversion receiver, the apparatus comprising:

  • a plurality of serially connected variable gain amplifiers configured to amplify an input signal based on respective preset gain control values;

    a DC offset monitoring unit configured to monitor a DC offset for an output signal of the plurality of variable gain amplifiers;

    a plurality of variable digital to analog converters (DACs) configured to control a current applied to each of the plurality of variable gain amplifiers according to respective current control codes; and

    a DC offset cancellation unit configured to determine a current control code set which minimizes the DC offset value per each of the preset gain control values,wherein each of the plurality of DACs corresponds to each of the plurality of variable gain amplifiers.

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