Title :
New Methods for QDDFS with Millions´ Compression Ratio
Author :
Zhanfeng, Zhao ; Zhiquan, Zhou ; Haiyan, Yu ; Xiaolin, Qiao
Author_Institution :
Harbin Inst. of Technol.
Abstract :
Two improved methods are introduced to compress the LUT ROM of QDDFS in this paper. Based on the principles of non-linear approach and trigonometry approximation, a new QDDFS architecture with high compression ratio is presented in the first method. Compression ratio with 762.05 is achieved in a 16bit system, using the first method. Another improved QDDFS method, with the Taylor expression, is proposed in the second method, which ten millions´ compression ratio can be achieved. The new methods have been analyzed theoretically and all the parameters have been optimized in the experiments. In the end, a simple system configuration is given in the paper
Keywords :
approximation theory; direct digital synthesis; read-only storage; table lookup; LUT ROM; QDDFS architecture; Taylor expression; compression ratio; direct digital frequency synthesis; nonlinear approach; trigonometry approximation; Approximation methods; Communication switching; Frequency control; Frequency synthesizers; Modems; Optimization methods; Read only memory; Signal generators; Signal to noise ratio; Table lookup; non-linear approach; taylor expression; trigonometry approximation;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342459
