Title :
A direct digital synthesizer with interpolation circuits
Author :
Nakagawa, T. ; Nosaka, H.
Author_Institution :
NTT Wireless Syst. Labs., Kanagawa, Japan
Abstract :
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.
Keywords :
direct digital synthesis; interpolation; square-wave generators; timing; DDS; accumulator; direct digital synthesizer; frequency synthesizer; interpolation circuits; low-spurious square waves; timing extraction; Circuits; Frequency synthesizers; Interpolation; Read only memory; Timing;
Conference_Titel :
VLSI Circuits, 1996. Digest of Technical Papers., 1996 Symposium on
Conference_Location :
Honolulu, HI, USA
Print_ISBN :
0-7803-3339-X
DOI :
10.1109/VLSIC.1996.507715
