Title :
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
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;
Conference_Titel :
ASIC Conference 1998. Proceedings. Eleventh Annual IEEE International
Conference_Location :
Rochester, NY
Print_ISBN :
0-7803-4980-6
DOI :
10.1109/ASIC.1998.723034
