DocumentCode :
2710286
Title :
Direct digital frequency synthesizer based on curve approximation
Author :
Liu, Xiaodong ; Shi, Yanyan ; Wang, Meng ; Deng, Jiaojiao
Author_Institution :
Key Lab. of Power Electron. & Motion Control, Anhui Univ. of Technol., Maanshan
fYear :
2008
fDate :
21-24 April 2008
Firstpage :
1
Lastpage :
4
Abstract :
Phase to amplitude conversion is an essential part in the technique of direct digital frequency synthesis. A novel theory of phase to amplitude conversion named curve approximation is proposed in this paper to solve the existing problems of present digital frequency synthesizers. It has more advantages over traditional phase to amplitude conversion methods, such as simple hardware circuit, fast conversion speed, low loss and high precision. A mathematical function approximating normalized waveforms is presented in the paper and then is corrected by a small ROM lookup table containing the difference between normalized waveform and curve approximation. It can be seen from MATLAB simulation that the given curve is essentially coincident with the normalized waveform. Frequency synthesizer based on DSP and MCU verifies the feasibility of curve approximation in direct digital frequency synthesis. Experimental result shows that this method has excellent performance.
Keywords :
digital signal processing chips; direct digital synthesis; mathematics computing; read-only storage; table lookup; waveform analysis; DSP; MATLAB simulation; MCU; ROM lookup table; curve approximation; direct digital frequency synthesizer; hardware circuit; phase-to-amplitude conversion; Analog-digital conversion; Clocks; Frequency conversion; Frequency synthesizers; Hardware; Laboratories; MATLAB; Read only memory; Signal synthesis; Table lookup;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Technology, 2008. ICIT 2008. IEEE International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-1705-6
Electronic_ISBN :
978-1-4244-1706-3
Type :
conf
DOI :
10.1109/ICIT.2008.4608703
Filename :
4608703
Link To Document :
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