Abstract
This paper presents a novel implementation of power amplifier linearization based on the second harmonic injection into the input with two different topologies, feedback, and forward injection. In both methods, a second harmonic signal with adjustable amplitude and phase, generated by a nonlinear differential network, is injected into the input of a PA. The tunable matching circuits of the proposed network provide linearization capability in a wide frequency band. A 10-Watts GaN PA with an operating frequency of 1.5 GHz is designed and fabricated. It is shown that using the proposed method in a feedback form makes the PA highly linearized in a wide bandwidth. Furthermore, injecting the second harmonic in a forward method improves the ACPR considerably and increases the output 1-dB compression point.
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