DocumentCode
2154394
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
fYear
2012
fDate
21-22 March 2012
Firstpage
729
Lastpage
733
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;
fLanguage
English
Publisher
ieee
Conference_Titel
Computing, Electronics and Electrical Technologies (ICCEET), 2012 International Conference on
Conference_Location
Kumaracoil
Print_ISBN
978-1-4673-0211-1
Type
conf
DOI
10.1109/ICCEET.2012.6203906
Filename
6203906
Link To Document