Title :
A Novel DDFS Based on Trigonometric Approximation with a Scaling Block
Author :
Babak, Farhad ; Keshavarzi, Parviz
Author_Institution :
Dept. of Electr. Eng., Semnan Univ., Semnan
Abstract :
Attempts have been made to present a 32 bit direct digital frequency synthesizer (DDFS) with a new ROM compression method based on the trigonometric identities of the sine function. In our proposed DDFS architecture 128 sinusoidal samples (1664 bits) are stored in the ROM and the other samples between these consecutive samples are obtained by using a 7 times 7 multiplier and a scaling block. This architecture was simulated at the system level by MATLAB Simulink and the results were mentioned. By using this algorithm, a very high compression ratio (551.3:1) and the spurious free dynamic range (SFDR) of 85 dbc are resulted.
Keywords :
approximation theory; frequency synthesizers; read-only storage; ROM compression method; direct digital frequency synthesizer; scaling block; sine function; spurious free dynamic range; trigonometric approximation; Clocks; Dynamic range; Frequency control; Frequency synthesizers; Information technology; Interpolation; Low pass filters; Polynomials; Read only memory; Signal generators; compression ratio; phase to sine-amplitude conversion; quadrant phase; quarter symmetry; spurious free dynamic range (SFDR);
Conference_Titel :
Information Technology: New Generations, 2009. ITNG '09. Sixth International Conference on
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-3770-2
Electronic_ISBN :
978-0-7695-3596-8
DOI :
10.1109/ITNG.2009.165
