Title :
A 0.8 /spl mu/m CMOS 350 MHz quadrature direct digital frequency synthesizer with integrated D/A converters
Author :
Edman, A. ; Bjorklid, A. ; Soderquist, I.
Author_Institution :
Dept. of Phys., Linkoping Univ., Sweden
Abstract :
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.
Keywords :
CMOS digital integrated circuits; circuit tuning; digital-analogue conversion; direct digital synthesis; interpolation; 0.8 micron; 350 MHz; 8 bit; CMOS; ROM; cosine values; differential D/A converters; four-phase analog output signal; integrated D/A converters; interpolation; quadrature direct digital frequency synthesizer; sine values; spurious free dynamic range; tuning resolution; Clocks; Decoding; Frequency synthesizers; Latches; Logic; Matrix converters; Pipeline processing; Read only memory; Resistors; Switches;
Conference_Titel :
VLSI Circuits, 1998. Digest of Technical Papers. 1998 Symposium on
Conference_Location :
Honolulu, HI, USA
Print_ISBN :
0-7803-4766-8
DOI :
10.1109/VLSIC.1998.688001
