A 0.6-V 30 GHz CMOS Quadrature VCO Using Microwave 1:1:1 Trifilar Transformer

A 30 GHz trifilar-transformer-coupled quadrature voltage-controlled oscillator (QVCO) is proposed in this letter using 0.13 μm CMOS technology. The trifilar transformer provides dc decoupling as well as ac mutual coupling from drain, gate, and source nodes. The mutual coupling increases the overall quality factor while the gate/drain-to-source coupling provides quadrature coupling. The proposed 1:1:1 trifilar transformer realization has lower ohmic loss than the conventional trifilar transformer realization and is especially suitable for high-frequency applications. As a result, the proposed 30 GHz QVCO has a -195 dBc/Hz figure of merit (FOM) and a maximum 41.6 dB sideband rejection (SBR) at a 0.6 V supply.

[1]  Christina F Jou,et al.  A Low Phase Noise Quadrature VCO Using Symmetrical Tail Current-Shaping Technique , 2010, IEEE Microwave and Wireless Components Letters.

[2]  A.W.L. Ng,et al.  A 1-V 17-GHz 5-mW CMOS Quadrature VCO Based on Transformer Coupling , 2007, IEEE Journal of Solid-State Circuits.

[3]  A. Rofougaran,et al.  A 900 MHz CMOS LC-oscillator with quadrature outputs , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[4]  Deukhyoun Heo,et al.  Analysis of resonator phase shift for two series LC quadrature VCOs , 2008 .

[5]  A. Bonfanti,et al.  Analysis and design of a 1.8-GHz CMOS LC quadrature VCO , 2002, IEEE J. Solid State Circuits.

[6]  Sheng-Lyang Jang,et al.  A 0.18 $\mu$ m CMOS Quadrature VCO Using the Quadruple Push-Push Technique , 2010, IEEE Microwave and Wireless Components Letters.

[7]  Songcheol Hong,et al.  8-GHz CMOS quadrature VCO using transformer-based LC tank , 2003 .

[8]  Guo-Wei Huang,et al.  SiGe HBT quadrature VCO utilizing trifilar transformers , 2008, 2008 IEEE Asian Solid-State Circuits Conference.

[9]  Songcheol Hong,et al.  A K-band quadrature VCO based on asymmetric coupled transmission lines , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[10]  Songcheol Hong,et al.  Design of a 24-GHz CMOS VCO With an Asymmetric-Width Transformer , 2010, IEEE Transactions on Circuits and Systems II: Express Briefs.