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A 0.8 /spl mu/m CMOS 350 MHz quadrature direct digital frequency synthesizer with integrated D/A converters

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3 Author(s)
Edman, A. ; Dept. of Phys., Linkoping Univ., Sweden ; Bjorklid, A. ; Soderquist, I.

This quadrature DDFS calculates sine and cosine values with a tuning resolution below 1 Hz, by only using an 8 word ROM and interpolation. Two internal 8-bit differential D/A converters generate the four-phase analog output signal. A spurious free dynamic range of 50 dB for low frequencies and 30 dB near Nyquist is achieved.

Published in:

VLSI Circuits, 1998. Digest of Technical Papers. 1998 Symposium on

Date of Conference:

11-13 June 1998