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Nonlinear Design Technique for High-Power Switching-Mode Oscillators

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3 Author(s)
Sanggeun Jeon ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA ; Suarez, A. ; Rutledge, D.B.

A simple nonlinear technique for the design of high-efficiency and high-power switching-mode oscillators is presented. It combines existing quasi-nonlinear methods and the use of an auxiliary generator (AG) in harmonic balance. The AG enables the oscillator optimization to achieve high output power and dc-to-RF conversion efficiency without affecting the oscillation frequency. It also imposes a sufficient drive on the transistor to enable the switching-mode operation with high efficiency. Using this AG, constant-power and constant-efficiency contour plots are traced in order to determine the optimum element values. The oscillation startup condition and the steady-state stability are analyzed with the pole-zero identification technique. The influence of the gate bias on the output power, efficiency, and stability is also investigated. A class-E oscillator is demonstrated using the proposed technique. The oscillator exhibits 75 W with 67% efficiency at 410 MHz

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 10 )