A new approach to design a Digital Direct Frequency Synthesizer using Chebyshev polynomial approximation is presented. The proposed technique is an improvement of previously DDFS circuits based on Taylor approximation. A detailed description of the method used to compute the content of the ROM in Chebyshev 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.
Direct Digital Frequency Synthesizers using First-Order Polynomial Chebyshev Approximation / Strollo, ANTONIO GIUSEPPE MARIA; Napoli, Ettore; DE CARO, Davide. - STAMPA. - (2002), pp. 527-530. (Intervento presentato al convegno 28th European Solid-State Circuits Conference (ESSCIRC 2002) tenutosi a Firenze nel Sept. 2002).
Direct Digital Frequency Synthesizers using First-Order Polynomial Chebyshev Approximation
STROLLO, ANTONIO GIUSEPPE MARIA;NAPOLI, ETTORE;DE CARO, Davide
2002
Abstract
A new approach to design a Digital Direct Frequency Synthesizer using Chebyshev polynomial approximation is presented. The proposed technique is an improvement of previously DDFS circuits based on Taylor approximation. A detailed description of the method used to compute the content of the ROM in Chebyshev 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
