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DC offset reduction in a zero-if transmitter

  • US 5,584,059 A
  • Filed: 06/30/1993
  • Issued: 12/10/1996
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a zero-IF transmitter having a feedback loop and having a DC offset, representative of a carrier feedthrough signal;

    a successive approximation register, operatively coupled to the zero-IF transmitter, arranged and constructed external to the feedback loop to successively approximate a value to correct the DC offset; and

    a summer, within the feedback loop of the zero-IF transmitter and operatively coupled to the successive approximation register, for adding the value to a desired input to reduce the DC offset.

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