Design of direct digital frequency synthesizer based onpiecewise-polynomial approximation
SONG Xueliang,GUO Yushun
(School of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China)
Abstract: In order to enhance the performance of direct digital frequency synthesizer(DDS), a new technique to implement a DDS with the phasetoamplitude conversion block using piecewisepolynomial approximation was presented.A design was presented to achieve in the popular fieldprogrammable gate array(FPGA) platform. The hardware was tested, an Altera FPGA prototype implementation results were summarized， the performance and resource consumption were compared with the approach of the ROM lookup table architecture. The experimental results show that this approach achieves better performance，and it reduces the circuit area through avoiding huge loopup table.
Key words: direct digital frequency synthesizer(DDS); phasetoamplitude conversion; piecewisepolynomial approximation; fieldprogrammable gate array(FPGA)