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Small VCO-Gain Variation Adding a Bias-Shifted Inversion-Mode MOS Varactor

This letter proposes a small voltage-controlled oscillator (VCO)-gain variation (AKVCO) technique using the capacitance-slope change of the varactor, which is achieved by adding a bias-shifted inversion-mode MOS varactor in parallel with a conventional accumulation-mode MOS varactor. This technique...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2017-04, Vol.27 (4), p.395-397
Main Authors: Lim, Chang-Woo, Noh, Hong-Yeoul, Yun, Tae-Yeoul
Format: Article
Language:English
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Summary:This letter proposes a small voltage-controlled oscillator (VCO)-gain variation (AKVCO) technique using the capacitance-slope change of the varactor, which is achieved by adding a bias-shifted inversion-mode MOS varactor in parallel with a conventional accumulation-mode MOS varactor. This technique is investigated via theoretical analysis, which is confirmed by simulation and measurement. The proposed VCO shows a phase noise of -116.4 dBc/Hz at a 1-MHz offset frequency at 2.36 GHz, a figure of merit of -185 dBc/Hz, and a AKVCO of less than 8.6% over a frequency tuning range from 1.73 to 2.36 GHz while consuming 0.76 mW from a 0.8-V supply voltage. It was implemented using a 110-nm CMOS process with a chip area of 0.95 mm 2 .
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2017.2678431