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Analytical study of an error envelope feedback linearizer

✍ Scribed by Giuseppe Macchiarella; Norman Carpenzano; Andrea Meazza

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
614 KB
Volume
16
Category
Article
ISSN
1096-4290

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✦ Synopsis

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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