Abstract
An error envelope feedback linearizer (EEFL) employs the complex envelope of the distortion generated by the power amplifier (PA) as a feedback to control the envelope of the PA input signal; in this way, a sort of predistortion is realized, allowing the reduction of the intermodulation distortion (IMD) produced by the PA. A recently introduced EEFL architecture is investigated in this article from a mathematical point of view; starting from the functional scheme of the linearizer, its response to one- and two-tone excitations is evaluated, allowing a simple estimation of the achievable performances (IMD reduction). The stability issue may constitute a severe limitation for this class of linearizers; by using both the introduced mathematical model and numerical simulations, the stability is investigated in order to obtain better insight into the working mechanism of the EEFL.
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