A ring VCO with wide and linear tuning characteristics for a cognitive radio system

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This paper presents a novel voltage-controlled ring oscillator fabricated in TSMC 0.18-μm CMOS technology. In order to obtain a linear frequency-voltage characteristic over a wide tuning range while maintaining good phase noise performance, a transmission gate was adopted in a saturated-type ring oscillator. The resistance tuning capability of the transmission gate was then theoretically and experimentally analyzed. The proposed ring oscillator achieved a wide operating frequency range from 20 MHz to 807 MHz covering TV channel bands for the Cognitive Radio spectrum sensing system. The measured phase noise is -108 dBc/Hz at 1-MHz offset from 630 MHz. The power consumption is 22 mW, and core chip area is 60 μm × 51 μm.
Publisher
IEEE
Issue Date
2008-06-01
Language
English
Citation

2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008, pp.395 - 398

DOI
10.1109/RFIC.2008.4561462
URI
http://hdl.handle.net/10203/269720
Appears in Collection
RIMS Conference Papers
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