Circuit Techniques for CMOS Divide-By-Four Frequency Divider

This letter describes circuit techniques for obtaining divide-by-four (divide4) frequency dividers (FDs) from CMOS ring-oscillator based injection locked frequency dividers (ILFDs). The circuit is made of a two-stage differential CMOS ring oscillator and is based on MOS switches directly coupled to...

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Veröffentlicht in:IEEE microwave and wireless components letters 2007-03, Vol.17 (3), p.217-219
Hauptverfasser: Jang, S.-L., Chuang, Y.-H., Lee, S.-H., Chao, J.-J.
Format: Artikel
Sprache:eng
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Zusammenfassung:This letter describes circuit techniques for obtaining divide-by-four (divide4) frequency dividers (FDs) from CMOS ring-oscillator based injection locked frequency dividers (ILFDs). The circuit is made of a two-stage differential CMOS ring oscillator and is based on MOS switches directly coupled to the differential outputs of the ring oscillator. At the supply voltage of 1.8V and at the incident power of 0dBm, for a dual-band ILFD, the divide4 ILFD can provide a locking range of 6.3% from 5.39 to 6.12GHz at low band and 5.9% from 8.84 to 9.38GHz at high band when the dc bias of MOS switches V inj changes from 0.7 to 1.1V
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2006.890491