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A Fundamental 90-GHz CMOS VCO Using New Ring-Coupled Quad

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5 Author(s)
Zuo-Min Tsai ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; Chin-Shen Lin ; Huang, C.F. ; Chern, J.G.J.
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A new circuit topology, named ring-coupled quad for millimeter-wave voltage controlled oscillator (VCO) design, is proposed. The proposed circuit topology provides higher open loop voltage gain than conventional cross-coupled pair. The layout of the proposed ring-coupled quad is fully symmetric without additional interconnection lines. A 90-GHz VCO using 90-nm CMOS process is implemented with this ring-coupled quad. This 90-GHz oscillator demonstrates a 2.5-GHz tuning range and higher than -20dBm output power. The proposed ring-coupled quad is suitable for the realization of high frequency VCOs

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:17 ,  Issue: 3 )