Combined power oscillator using GaN HEMT

This paper proposes a new configuration for power oscillator based on the combined power amplifier. The focus is on power combining as a oscillator structure with a positive feedback loop line. The proposed configuration consists of a harmonic-tuned combined power amplifier using two Gallium Nitride High Electron Mobility Transistors (CGH40025), 3dB Wilkinson divider/combiner, a directional coupler, an isolator, a coaxial line and mechanical phase shifters. The steady state oscillation occurs in a delay line feedback loop which length is adjusted to a oscillation frequency. The measured output power and conversion efficiency of the proposed oscillator are 46.8 dBm and 58 %, respectively, at 2.45 GHz with a drain bias voltage of 28 V.

[1]  San Marcos CA 92069 sales.  Gallium Nitride ( GaN ) Microwave Transistor Technology For Radar Applications , 2008 .

[2]  Zoya Popovic,et al.  A 5-GHz high-efficiency class-E oscillator , 1996 .

[3]  Frank Ellinger,et al.  Design of a low-supply-voltage high-efficiency class-E voltage-controlled MMIC oscillator at C-band , 2001 .

[4]  Sanggeun Jeon,et al.  Nonlinear Design Technique for High-Power Switching-Mode Oscillators , 2006, IEEE Transactions on Microwave Theory and Techniques.

[5]  D. Reffet,et al.  High efficiency free running class F oscillator , 1995, Proceedings of 1995 IEEE MTT-S International Microwave Symposium.

[6]  Jin Joo Choi,et al.  Frequency-tunable high-efficiency power oscillator using GaN HEMT , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[7]  A. Gitsevich,et al.  Solid-state high power RF oscillator , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[8]  M. Kazimierczuk,et al.  Class E high-efficiency tuned power oscillator , 1981 .

[9]  Jin Joo Choi,et al.  High-efficiency power oscillator using harmonic-tuned matching network , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.