A Fast 1.9 GHz Fractional-N/Integer Frequency Synthesizer with a Self-tuning Algorithm

A Fast 1.9 GHz Fractional-N/Integer Frequency Synthesizer with a Self-tuning Algorithm

A self-tuning, adaptive 1.9GHz fractional-N/integer frequency synthesizer is proposed in the paper. A combined tuning technique of digital tuning and analog tuning is used to decrease the gain of VCO. The adaptive loop is introduced for automatic adjustment of the loop bandwidth. Two operation modes...

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Bibliographische Detailangaben
Hauptverfasser: Shuilong Huang, Zhihua Wang, Huainan Ma
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Adaptive
Bandwidth
Charge pumps
Counting circuits
Divider
Filters
Frequency synthesizer
Frequency synthesizers
PFD
Phase frequency detector
Phase locked loops
Phase noise
Self-tuning
Tuning
Voltage-controlled oscillators
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Zusammenfassung:A self-tuning, adaptive 1.9GHz fractional-N/integer frequency synthesizer is proposed in the paper. A combined tuning technique of digital tuning and analog tuning is used to decrease the gain of VCO. The adaptive loop is introduced for automatic adjustment of the loop bandwidth. Two operation modes (fractional-N/integer) are achieved by switching on/off the output signal of SigmaDelta modulator. Just a programmable counter is needed for the swallow pulse divider. Based on 0.18 mum 1.8V CMOS technology. Simulation shows that the frequency synthesizer has a 100 KHz loop bandwidth, a
DOI:10.1109/APCCAS.2006.342367