A fundamental 90-GHz CMOS VCO using new ring-coupled quad
Journal
IEEE Microwave and Wireless Components Letters
Journal Volume
17
Journal Issue
3
Pages
226-228
Date Issued
2007
Author(s)
Abstract
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 -20 dBm output power. The proposed ring-coupled quad is suitable for the realization of high frequency VCOs. © 2007 IEEE.
Other Subjects
Cross-coupled; Millimeter-wave; Voltage controlled oscillator (VCO)
Type
journal article