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Direct conversion receiver architecture with digital fine resolution variable gain amplification

  • US 8,634,790 B2
  • Filed: 05/16/2005
  • Issued: 01/21/2014
  • Est. Priority Date: 02/16/2001
  • Status: Expired due to Term
First Claim
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1. A method of processing a desired signal in a wireless communication system, comprising:

  • amplifying the desired signal with a first gain having a coarse resolution;

    downconverting the amplified signal from radio frequency (RF) to baseband with a single frequency downconversion stage configured to receive a digital offset control signal and an analog offset control signal independent of the digital offset control signal, wherein and a gain control value of the first gain, the digital offset control signal, and the analog offset control signal are derived at least in part from a value of a DC offset of the baseband and the digital and analog offset control signals are separately applied in different stages during the downconverting;

    digitizing the downconverted signal to provide samples;

    correcting for the DC offset in the downconverted signal with a DC loop; and

    digitally amplifying the samples with a second gain having a fine resolution to provide output data having a desired signal amplitude.

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