Title :
A 250MHz direct digital frequency synthesizer with /spl Sigma//spl Delta/ noise shaping
Author :
Yongchul Song ; Beomsup Kim
Author_Institution :
KAIST, Daejeon, South Korea
Abstract :
A 14b direct digital frequency synthesizer in 0.25/spl mu/m CMOS uses a 2b second-order /spl Sigma//spl Delta/ modulator. The /spl Sigma//spl Delta/ noise shaping significantly reduces spurs caused by phase truncation and the measured SFDR is >110dB. The prototype IC consumes 100mW with a 2.5V supply and works to 250MHz.
Keywords :
CMOS digital integrated circuits; direct digital synthesis; sigma-delta modulation; /spl Sigma//spl Delta/ noise shaping; 0.25 micron; 100 mW; 2.5 V; 250 MHz; CMOS; SFDR; direct digital frequency synthesizer; phase truncation; second-order /spl Sigma//spl Delta/ modulator; spurs; Digital-analog conversion; Digital-to-frequency converters; Dynamic range; Frequency control; Frequency synthesizers; Hardware; Multiaccess communication; Noise shaping; Quantization; Tuning;
Conference_Titel :
Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC. 2003 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-7707-9
DOI :
10.1109/ISSCC.2003.1234392
