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Wide-Bandwidth Power-Combining and Inverse Class-F GaN Power Amplifier at X-Band

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4 Author(s)
Stameroff, A.N. ; Dept. of Electr. & Comput. Eng., Univ. of California at Davis, Davis, CA, USA ; Ta, H.H. ; Anh-Vu Pham ; Leoni, R.E.

In this paper, we present a wide bandwidth power amplifier (PA) utilizing a Marchand balun to achieve power combining and inverse class-F (class-F-1) matching. We have used a 4-to-1 balun and its out-of-band characteristics to achieve matching at the second and third harmonic for differential class-F-1 operation. Thus, the balun simultaneously acts as a combiner and harmonic matching network. The experimental results demonstrate that the prototype PA achieves an output power of 41.5 dBm at the 1-dB compression point (P1 dB), power-added efficiency of 55%, and gain of 10 dB over a fractional bandwidth of 40% from 8 to 12 GHz. Due to the differential operation, the class-F-1 PA has also achieved a measured second harmonic distortion of -50 dBc.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:61 ,  Issue: 3 )