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Hardware-efficient phase-to-amplitude mapping design for direct digital frequency synthesizers

  • US 7,580,964 B2
  • Filed: 01/25/2006
  • Issued: 08/25/2009
  • Est. Priority Date: 01/25/2006
  • Status: Expired due to Fees
First Claim
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1. A phase-to-amplitude sinusoidal mapping circuit using linear approximation, comprising:

  • A base decoder that decodes a number of MSBs of a digital phase angle to generate a base value of a sinusoidal amplitude for the phase angle;

    A controller that maps the MSBs to a segment number in a quadrant of the sinusoid to select at least one signed shift value for that segment number;

    At least one shifter block that shifts the remaining LSBs of the phase angle by the corresponding shift value; and

    An adder that adds the at least one signed and shifted LSBs to the base value to provide an approximate sinusoidal amplitude for the phase angle.

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