Ku-Band Novel Voltage Controlled Oscillator Microwave Integrated Circuit with Low Phase Noise

This paper describes design and analysis of voltage controlled oscillator using NPN Silicon Germanium RF transistor operating in Ku-band frequencies. Novel topology is proposed with tunable active matching filter networks are used as resonators connected to parallel emitters. Resonator contains varactor diodes to provide voltage controlled frequency tuning. Series LC network connected at the base of device helps in increasing S11 and S22 >1 further leading to enough negative resistance at input and output ports. Analysis shows that it provides considerably low phase noise operation in Ku-band. This is due to the significant quality factor limits further degradation in phase noise. Interactive program was developed in Agilent's Advanced Design System (ADS) tool to choose better reflection coefficient considering trade-offs. 5.4 dBm output spectrum is achieved at 14.9GHz frequency without using buffer. VCO can be tuned in 14.85GHz to 14.95GHz frequency band using 0-22V varactor diode variable bias. Second order harmonic is -44 dBc below from the fundamental tone.

[1]  Jianyi Zhou,et al.  A low phase noise X-Band push-push VCO with microstrip resonator , 2008, 2008 International Conference on Microwave and Millimeter Wave Technology.

[2]  Jason Breitbarth,et al.  Design and Characterization of Low Phase Noise Microwave Circuits , 2006 .

[3]  Z. Popovic,et al.  Design method for low-power, low phase noise voltage-controlled oscillators , 2007, 2007 European Microwave Integrated Circuit Conference.

[4]  Luis Enrique Garcia-Munoz,et al.  Oscillator Accurate Linear Analysis and Design. Classic Linear Methods Review and Comments , 2011 .

[5]  A. Mortazawi,et al.  Low Phase-Noise Planar Oscillators Based on Low-Noise Active Resonators , 2010, IEEE Transactions on Microwave Theory and Techniques.

[6]  Georg Böck,et al.  The Design of Modern Microwave Oscillators for Wireless Applications : Theory and Optimization , 2005 .

[7]  Amir Mortazawi,et al.  Oscillator phase-noise reduction using low-noise high-Q active resonators , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[8]  G. Gonzalez.  Microwave Transistor Amplifiers: Analysis and Design , 1984 .

[9]  Randall W. Rhea,et al.  Oscillator design and computer simulation , 1990 .

[10]  Ulrich L. Rohde,et al.  About the oscillator basics and low-noise techniques for microwave oscillators and VCOs , 2010, ICIA 2010.

[11]  A. Mortazawi,et al.  Low Phase-Noise Planar Oscillators Employing Elliptic-Response Bandpass Filters , 2009, IEEE Transactions on Microwave Theory and Techniques.

[12]  Stephen A. Maas,et al.  Nonlinear Microwave and RF Circuits , 2003 .

[13]  Stephen A. Maas,et al.  Microwave Mixers , 1986 .

[14]  Ulrich L. Rohde,et al.  Microwave Circuit Design Using Linear and Nonlinear Techniques: Vendelin/Microwave Circuit Design Using Linear and Nonlinear Techniques , 1990 .

[15]  U.L. Rohde,et al.  Novel Multi-Coupled Line Resonators Replace Traditional Ceramic Resonators in Oscillators/VCOs , 2006, 2006 IEEE International Frequency Control Symposium and Exposition.

[16]  A. Mortazawi,et al.  A very low phase-noise voltage-controlled-oscillator at X-band , 2011, 2011 IEEE MTT-S International Microwave Symposium.