Abstract
Envelope tracking (ET) linearizability of a power amplifier (PA) is studied in this paper. ET linearization can be explained as the cancellation between two intermodulation distortion (IMD) components [1], [2]. The phase difference θ 0 between the two IMD components is identified as the criterion of ET linearizability. The IMD improvement by incorporating ET module with PA can be analytically calculated in terms of $\theta_{0}$ Excellent agreement between the prediction and measurement is achieved. Determination of $\theta_{0}$ using three-tone measurement is proposed and demonstrated. ET linearizability is an inherent feature of a standalone PA itself, and can be quantitatively predicted before incorporating an ET module.
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