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A 0.3-V power supply 2.4-GHz-band Class-C VCO IC with amplitude feedback loop in 65-nm CMOS

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Abstract

A Class-C voltage-control-oscillator (VCO) IC with an amplitude feedback loop for ultra-low-voltage application is proposed. The Class-C VCO consists of an LC-VCO circuit and an amplitude feedback loop to shift LC-VCO bias condition from initial Class-AB start-up to steady Class-C low current oscillation. The amplitude feedback loop is formed by a detector and a comparator with low voltage supply. The LC-VCO IC has been designed, fabricated and fully evaluated using 65-nm CMOS technology. The fabricated Class-C VCO IC exhibits a measured phase noise of \(-\)111 dBc/Hz at 1 MHz offset from the 2.43 GHz carrier frequency at a supply voltage of only 0.3 V.

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Acknowledgments

This work is supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant-in-Aid for Scientific Research Number 23360162. This work is supported by VDEC, University of Tokyo in collaboration with Cadence Design Systems Inc, Mentor Graphics Inc, and Agilent Technologies Japan Ltd.

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Authors and Affiliations

  1. The Graduate School of Information, Production and Systems, Waseda University, Kitakyushu-shi , 808-0135, Japan

    Xin Yang, Yorikatsu Uchida, Kangyang Xu, Wei Wang & Toshihiko Yoshimasu

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  1. Xin Yang
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  2. Yorikatsu Uchida
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  3. Kangyang Xu
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  4. Wei Wang
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  5. Toshihiko Yoshimasu
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Correspondence to Toshihiko Yoshimasu.

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Yang, X., Uchida, Y., Xu, K. et al. A 0.3-V power supply 2.4-GHz-band Class-C VCO IC with amplitude feedback loop in 65-nm CMOS. Analog Integr Circ Sig Process 81, 583–591 (2014). https://doi.org/10.1007/s10470-014-0351-8

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  • DOI: https://doi.org/10.1007/s10470-014-0351-8

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