A DDS synthesizer with digital time domain interpolator

A DDS type circuit structure for producing numerically programmable square wave clock signal is presented. The high speed D/A converter needed in conventional DDS systems is replaced by an N tap delay line time domain interpolator that effectively increases the sampling rate by a factor of N. Thus t...

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Bibliographic Details
Published in:Analog integrated circuits and signal processing 2001-04, Vol.27 (1-2), p.109-116
Main Authors: Rahkonen, T, Eksyma, H, Mantyniemi, A, Repo, H
Format: Article
Language:English
Online Access:Get full text
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Summary:A DDS type circuit structure for producing numerically programmable square wave clock signal is presented. The high speed D/A converter needed in conventional DDS systems is replaced by an N tap delay line time domain interpolator that effectively increases the sampling rate by a factor of N. Thus the circuit can be used up to full clock rate without image filtering. A prototype IC with clock frequency of 30 MHz, 5 bit interpolator and SFDR of -40 dBc up to 10 MHz and -33 dBc up to 15 MHz has been designed and tested.
ISSN:0925-1030