A phase-coherent numerically controlled oscillator based on pipeline architecture

Author

Nagvajara, P. ; Damarla, T.R. ; Wang, J. ; Chansilp, S.

Author_Institution

Dept. of Electr. & Comput. Eng., Drexel Univ., Philadelphia, PA, USA

fYear

1998

fDate

13-16 Sep 1998

Firstpage

355

Lastpage

358

Abstract

A design of a pipeline architecture for a phase coherent numerically controlled oscillator (NCO) is presented. The NCO synchronously generates sampled sinusoidal waveforms A cos(2πft+φ) and A sin(2πft+φ), as 16-bit signed integer values. The pipeline architecture includes multipliers, adders, and a 64K×16 embedded ROM. The proposed NCO provides waveform phase coherency relative to the time reference over varying frequencies, which is essential for coherent radar seekers using stepped frequency in Doppler synthesis

Keywords

digital signal processing chips; numerical control; oscillators; pipeline processing; table lookup; waveform generators; Doppler synthesis; adders; coherent radar seekers; embedded ROM; multipliers; numerically controlled oscillator; phase-coherent oscillator; pipeline architecture; sampled sinusoidal waveform generation; stepped frequency; Circuit synthesis; Clocks; Counting circuits; Doppler radar; Frequency synthesizers; Oscillators; Pipelines; Signal synthesis; Synchronous generators; Table lookup;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC Conference 1998. Proceedings. Eleventh Annual IEEE International

Conference_Location

Rochester, NY

ISSN

1063-0988

Print_ISBN

0-7803-4980-6

Type

conf

DOI

10.1109/ASIC.1998.723034

Filename

723034