High-Performance 76-GHz Planar Gunn VCO

Yoshimichi FUKASAWA  Kiyoshi KAWAGUCHI  Takashi YOSHIDA  Takahiro SUGIYAMA  Atsushi NAKAGAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.7   pp.1098-1103
Publication Date: 2008/07/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.7.1098
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Heterostructure Microelectronics with TWHM 2007)
Category: GaAs- and InP-Based Devices
Keyword: 
Gunn VCO,  flip-chip,  millimeter-wave,  tuning-frequency range,  laser micromachining,  

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Summary: 
A 76-GHz Gunn voltage-controlled oscillator (VCO) with a high output power and a wide tuning-frequency range was fabricated by optimizing VCO circuits and using laser micromachining. The tuning-frequency range of the fabricated Gunn VCO was more than two times higher than that attained in our previous experiments by optimizing VCO circuits. The VCO attained a tuning-frequency range of 493 MHz, output power variation of 1.0 dB, and tuning-frequency linearity of 6.1% over a tuning-voltage range from 0 to 10 V. Its power consumption was 2.0 W at operation voltage of 3.6 V. And it measured output power was 13.3 dBm with DC-RF conversion efficiency of 1.0% at 76.5 GHz. Moreover, under fundamental-mode operation, it achieved low phase noise of -107.8 dBc/Hz at an offset frequency of 1 MHz. Since laser micromachining was used in fabricating the Gunn VCO, the reproducibility of its RF performance was improved.