Pentomics Patents: Direct Digital Frequency Synthesizer
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چکیده
Direct Digital Frequency Synthesizer Pentomics’ first DDS patent concerns a method and apparatus for DDS which, unlike the traditional table-lookup methods, uses a simplified “angle-rotation” algorithm implemented as a multiplierless feedforward datapath, allowing easy pipelining and limiting the accumulation of roundoff errors. Our DDS’s modular architecture permits outputs of arbitrary precision by simply cascading a sufficient number of angle-rotation stages in the datapath. These angle-rotation, or “butterfly” stages may appear somewhat similar to those of the CORDIC algorithm. Unlike CORDIC, however, the Pentomics angle-rotation technique does not require the successive stageby-stage computation of angle-rotation directions. Fig. 1 shows the architecture of a prototype
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