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This paper describes a low-noise, 900-MHz, voltage-controlled oscillator (VCO) fabricated in a 0.6-μm CMOS technology. The VCO consists of four-stage fully differential delay cells performing full switching. It utilizes dual-delay path techniques to achieve high oscillation frequency and obtain a wide tuning range. The VCO operates at 750 MHz to 1.2 GHz, and the tuning range is as large as 50%. The measured results of the phase noise are -101 dBc/Hz at 100-kHz offset and -117 dBc/Hz at 600-kHz offset from the carrier frequency. This value is comparable to that of LC-based integrated oscillators. The oscillator consumes 10 mA from a 3.0-V power supply. A prototype frequency synthesizer with the VCO is also implemented in the same technology, and the measured phase noise of the synthesizer is -113 dSc/Hz at 100-kHz offset
Published in:
Solid-State Circuits, IEEE Journal of
(Volume:34
,
Issue:
5
)
Date of Publication: May 1999
- Page(s):
- 586 - 591
- ISSN :
- 0018-9200
- INSPEC Accession Number:
- 6248055
- Digital Object Identifier :
- 10.1109/4.760367
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- May 1999
- Sponsored by :
- IEEE Solid-State Circuits Society
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