Abstract
The paper introduces a new approach to design a Digital Direct Frequency Synthesizer (DDFS) using a piecewise linear, minimum maximum error, polynomial approximation technique. The approach, exploiting a first order Chebyshev polynomial expansion, overcomes the performances of previously proposed DDFS based on Taylor approximation.A detailed description of the method used to compute the content of the look-up tables in the new DDFS is given, analytically showing the improved accuracy of new DDFS with respect to Taylor one.Two new Chebyshev DDFS with 80dBc SFDR, have been designed up to the layout level, exploiting optimized arithmetic circuits. Simulation results confirm improvement in performances with respect to Taylor DDFS.
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