Title :
Direct digital frequency synthesizer using cubic spline approximations
Author :
Shamalla, K. ; Gayathri, K. ; Sugumar, Preethi ; Hariharan, K.
Author_Institution :
ECE, Thiagarajar Coll. of Eng., Madurai, India
Abstract :
The conventional direct digital frequency synthesizer (DDFS) based on polynomial approximations has a very high complexity. This paper describes a low complexity DDFS with a high spectral purity. It is based on the cubic spline approximation for sine and cosine functions, exploiting the symmetry of the sine function. The proposed DDFS offers maximum smoothness of the output signal and has a high SFDR (spurious free dynamic range) of about 121.7 dBc.
Keywords :
direct digital synthesis; polynomial approximation; spectral analysis; splines (mathematics); SFDR; conventional direct digital frequency synthesizer DDFS; cosine function; cubic spline approximations; output signal; polynomial approximations; spectral purity; spurious free dynamic range; Adders; Computers; Polynomials; Radio frequency; Read only memory; Silicon compounds; Yttrium; DDFS; cubic spline; frequency control word (FCW); quarter wave symmetry; spurious free dynamic range;
Conference_Titel :
Computing, Electronics and Electrical Technologies (ICCEET), 2012 International Conference on
Conference_Location :
Kumaracoil
Print_ISBN :
978-1-4673-0211-1
DOI :
10.1109/ICCEET.2012.6203906
