A Study of Striped Inductor for K- and Ka-Band Voltage-Controlled Oscillators

Nobuyuki ITOH
Hiroki TSUJI
Kiyotaka KOMOKU

IEICE TRANSACTIONS on Electronics   Vol.E99-C    No.6    pp.614-622
Publication Date: 2016/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.614
Type of Manuscript: Special Section INVITED PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
skin effect,  striped inductor,  Q factor,  corner frequency,  voltage-controlled oscillator,  phase noise,  

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A striped inductor and its utilization of a voltage-controlled oscillator (VCO) are studied with the aim of suppressing phase noise degradation in K- and Ka-bands. The proposed striped inductor exhibits reduced series resistance in the high frequency region by increasing the cross-sectional peripheral length, as with the Litz wire, and the VCO of the striped inductor simultaneously exhibits a lower phase noise than that of the conventional inductor. Striped and conventional inductors and VCOs are designed and fabricated, and their use of K- and Ka-bands is measured. Results show that the Q factor and corner frequency of the striped inductor are approximately 1.3 and 1.6 times higher, respectively, than that of the conventional inductor. Moreover, the 1-MHz-offset phase noise of the striped inductor's VCO in the K- and Ka-bands was approximately 3.5 dB lower than that of the conventional inductor. In this study, a 65-nm standard CMOS process was used.