High-speed direct digital frequency synthesizers in 0.25-μm CMOS

Author

Strollo, A.G.M. ; De Caro, D. ; Napoli, E. ; Petra, N.

Author_Institution

Dept. of Electron. & Telecom. Eng., Naples Univ., Italy

fYear

2004

fDate

3-6 Oct. 2004

Firstpage

163

Lastpage

166

Abstract

Two high-speed direct digital frequency synthesizers (DDFS) have been fabricated in CMOS 0.25 μm technology. Both DDFS provides two quadrature phase 12 bit outputs with a spectral purity of 80 dBc. The first circuit reaches a maximum operating frequency of 600 MHz. The second circuit operates up to 480 MHz clock speed while dissipating only 72 μW/MHz. The proposed circuits employ an innovative high-speed architecture for sine and cosine functions approximation, based on a hardware-effective linear interpolation approach name as "dual-slope".

Keywords

CMOS integrated circuits; UHF integrated circuits; direct digital synthesis; function approximation; interpolation; low-power electronics; 0.25 mm; 480 MHz; 600 MHz; CMOS; cosine function approximation; dual-slope DDFS; dual-slope linear interpolation method; high-speed direct digital frequency synthesizers; low-power DDFS; output spectral purity; quadrature phase outputs; sine function approximation; CMOS technology; Chebyshev approximation; Circuits; Clocks; Frequency control; Frequency synthesizers; Interpolation; Multiplexing; Piecewise linear approximation; Power dissipation;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004

Print_ISBN

0-7803-8495-4

Type

conf

DOI

10.1109/CICC.2004.1358764

Filename

1358764