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Theory and Design of Class-J Power Amplifiers With Dynamic Load Modulation

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10 Author(s)
Andersson, C.M. ; Microwave Electron. Lab., Chalmers Univ. of Technol., Goteborg, Sweden ; Gustafsson, D. ; Yamanaka, K. ; Kuwata, E.
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A theory for class-J microwave amplifier operation as a function of drive level and fundamental load impedance is derived. Calculations show that, under appropriate operating conditions, it is sufficient to modulate the transistor load reactance to enable high-efficiency operation (>;70%) over a large output power dynamic range (>;10 dB) with high transistor power utilization. Such dynamic load modulation (DLM) networks are an ideal application of continuously tunable varactor technologies. Multiharmonic load-pull measurements are performed on a GaN HEMT and experimentally verify the theory of operation. A demonstrator amplifier using an SiC varactor technology is then designed and characterized by static measurements. The amplifier has a peak power of 38 dBm at 2.08 GHz and maintains efficiencies above 45% over 8 dB of power dynamic range. An analysis of the load network losses is performed to show the potential of the class-J DLM transmitter concept.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 12 )