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

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

[1]  L.-T. Hwang,et al.  Simulation and design of lossy transmission lines in a thin-film multichip package , 1990 .

[2]  Hong-Yeh Chang,et al.  A 131 GHz push-push VCO in 90-nm CMOS technology , 2005, 2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers.

[3]  B.A. Bloechel,et al.  64 GHz and 100 GHz VCOs in 90 nm CMOS using optimum pumping method , 2004, 2004 IEEE International Solid-State Circuits Conference (IEEE Cat. No.04CH37519).

[4]  Chih-Sheng Chang,et al.  A 114 GHz VCO in 0 . 13 μ m CMOS Technology , 2002 .

[5]  Hong-Yeh Chang,et al.  A low phase noise 52-GHz push-push VCO in 0.18-/spl mu/m bulk CMOS technologies , 2005, 2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers.

[6]  Chih-Sheng Chang,et al.  A 114GHz VCO in 0.13 /spl mu/m CMOS technology , 2005, ISSCC. 2005 IEEE International Digest of Technical Papers. Solid-State Circuits Conference, 2005..

[7]  Changhua Cao,et al.  A 90-GHz voltage-controlled oscillator with a 2.2-GHz tuning range in a 130-nm CMOS technology , 2005, Digest of Technical Papers. 2005 Symposium on VLSI Circuits, 2005..

[8]  Hong-Yeh Chang,et al.  A 63 GHz VCO using a standard 0.25 /spl mu/m CMOS process , 2004, 2004 IEEE International Solid-State Circuits Conference (IEEE Cat. No.04CH37519).