Title :
Quadrature direct digital frequency synthesizers with super high memory compression ratio and its parameter optimization
Author :
Lin, Maoliu ; Xu, Qinghua ; Qi, Xiaohui
Author_Institution :
Dept. of Inf. Eng., Harbin Inst. of Technol., China
Abstract :
This paper presents a quadrature direct digital frequency synthesizer (QDDFS) with super high memory compression ratio and analyzes its design principle theoretically. Its parameters have also been optimized. Trigonometric approximation and linear approach are combined coherently in order to reduce the size of the ROM (1856 bit). The compression ratio for the look-up table is 565:1 and the spurious free dynamic range (SFDR) is 96 dBc. Finally the architecture for proposed scheme is given.
Keywords :
data compression; direct digital synthesis; read-only storage; table lookup; look-up table; parameter optimization; quadrature direct digital frequency synthesizers; spurious free dynamic range; super high memory compression ratio; trigonometric approximation; Clocks; Design optimization; Frequency control; Frequency synthesizers; Linear approximation; Modems; Radar countermeasures; Read only memory; Signal generators; Table lookup;
Conference_Titel :
Communications and Information Technology, 2005. ISCIT 2005. IEEE International Symposium on
Print_ISBN :
0-7803-9538-7
DOI :
10.1109/ISCIT.2005.1567078
