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Frequency searcher and frequency-locked data demodulator using a programmable rotator

  • US 7,020,225 B2
  • Filed: 12/07/2001
  • Issued: 03/28/2006
  • Est. Priority Date: 01/19/2001
  • Status: Active Grant
First Claim
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1. A method of finding a signal having a deviation from an expected frequency, the method comprising:

  • first phase rotating a signal to partially reduce a phase error of the signal and produce a partially rotated output signal;

    accumulating a plurality of chips from the partially rotated output signal to form segments of the partially rotated output signal;

    second phase rotating the segments of the partially rotated output signal to further reduce a phase error of the segments by adjusting the phase over each segment; and

    generating a phase increment signal based on the phase error of the segments, the first phase rotating the signal to partially reduce the phase error of the signal based on an accumulation of the phase increment signal.

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