A direct digital synthesizer with interpolation circuits

Author

Nakagawa, Tadao ; Nosaka, Hideyuki

Author_Institution

NTT Wireless Syst. Labs., Kanagawa, Japan

Volume

32

Issue

5

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

766

Lastpage

770

Abstract

This paper presents a direct digital synthesizer (DDS) with no ROM that still produces square waves with low spurious signals. The main features are the interpolation of the analog-converted accumulator contents and the extraction of timing at the points where the interpolated signal is identical to a continuous sawtooth waveform. Experimental results confirm successful frequency synthesizer operation. The output frequency is determined by the frequency control word, and spurious signals present in the accumulator contents are greatly reduced

Keywords

CMOS integrated circuits; direct digital synthesis; elemental semiconductors; frequency control; interpolation; mixed analogue-digital integrated circuits; silicon; square-wave generators; timing; DDS; Si; analog-converted accumulator; direct digital synthesizer; frequency control word; frequency synthesizer; interpolation circuits; low spurious signals; square wave output; timing extraction; Circuits; Clocks; Degradation; Frequency control; Frequency synthesizers; Interpolation; Phase locked loops; Read only memory; Timing; Tuning;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.568849

Filename

568849