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Source and load impedance conditions for the second harmonics have a great influence on the efficiency of amplifiers. The bandwidth of high-efficiency operation is limited, since efficiency is drastically degraded due to a slight change in source-side second harmonic impedance from the optimum point. For this reason, to avoid steep efficiency degradation, a source-side second harmonic impedance control...
An increase in amplifier efficiency is generally accompanied by a narrow bandwidth characteristic, especially when used with distributed transmission lines, since higher harmonics have to be treated. The frequency dependence of harmonic reactive terminations using transmission lines has been discussed for a high-efficiency amplifier design. In simulation, the designed amplifiers showed steep efficiency...
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