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A phase-coherent numerically controlled oscillator based on pipeline architecture
Conference proceeding

A phase-coherent numerically controlled oscillator based on pipeline architecture

P Nagvajara, T.R Damarla, J Wang and S Chansilp
Proceedings Eleventh Annual IEEE International ASIC Conference (Cat. No.98TH8372), pp 355-358
1998

Abstract

Circuit synthesis Clocks Counting circuits Doppler radar Frequency synthesizers Oscillators Pipelines Signal synthesis Synchronous generators Table lookup
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(2/spl pi/ft+/spl phi/) and A sin(2/spl pi/ft+/spl phi/), as 16-bit signed integer values. The pipeline architecture includes multipliers, adders, and a 64K/spl times/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.

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Engineering, Electrical & Electronic
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