A low-complexity direct digital frequency synthesizer

Author

Lin-Hui, Lai ; Xiao-Jin, Li ; Zong-sheng, Lai

Author_Institution

Inst. of Microelectron. Circuit & Syst., East China Normal Univ., Shanghai, China

fYear

2008

fDate

20-23 Oct. 2008

Firstpage

1653

Lastpage

1656

Abstract

The traditional direct digital frequency synthesizer (DDFS) based on a lookup table has very high complexity. This paper describes a low complexity DDFS using smaller lookup table and with minimum additional hardware. The lookup table for sine/cosine functions is split into a coarse-precision ROM and a fine-precision ROM. Approximation of fine-precision ROM and application of shift registers are introduced to further reduce the hardware complexity. The implemental results show that the total size of ROM in this proposed DDFS architecture is only 328 bits compared with 448 bits , and the spectral purity can be as good as 63.58 dBc.

Keywords

direct digital synthesis; read-only storage; shift registers; table lookup; DDFS; coarse-precision ROM; fine-precision ROM; hardware complexity reduction; lookup table; low-complexity direct digital frequency synthesizer; shift registers; sine/cosine functions; spectral purity; Clocks; Digital communication; Frequency control; Frequency synthesizers; Hardware; Microelectronics; Phase locked loops; Read only memory; Shift registers; Table lookup; digital communications; direct digital frequency synthesis (DDFS); low-complexity; spectral purity;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-2185-5

Electronic_ISBN

978-1-4244-2186-2

Type

conf

DOI

10.1109/ICSICT.2008.4734868

Filename

4734868