A 250MHz direct digital frequency synthesizer with /spl Sigma//spl Delta/ noise shaping

A 250MHz direct digital frequency synthesizer with /spl Sigma//spl Delta/ noise shaping

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 su...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Yongchul Song, Beomsup Kim
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Digital-analog conversion
Digital-to-frequency converters
Dynamic range
Frequency control
Frequency synthesizers
Hardware
Multiaccess communication
Noise shaping
Quantization
Tuning
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Beschreibung
Zusammenfassung: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.
ISSN:0193-6530
2376-8606
DOI:10.1109/ISSCC.2003.1234392