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A direct digital synthesizer with interpolation circuits

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2 Author(s)
T. Nakagawa ; NTT Wireless Syst. Labs., Kanagawa, Japan ; H. Nosaka

This paper presents a direct digital synthesizer (DDS) that has no ROM, but produces low-spurious square waves. The main feature is the interpolation of the analog-converted signal of the accumulator and the extraction of the timing when the interpolated signal is identical with a hypothetical continuous sawtooth waveform. Experimental results confirm successful frequency synthesizer operation. The spurious signal is successfully reduced in comparison with the raw analog-converted signal of the accumulator.

Published in:

VLSI Circuits, 1996. Digest of Technical Papers., 1996 Symposium on

Date of Conference:

13-15 June 1996