Digital predistortion of envelope tracking amplifiers driven by slew-rate limited envelopes
Document typeConference report
PublisherIEEE Microwave Theory and Techniques Society
Rights accessRestricted access - publisher's policy
This paper presents a new Digital Predistorter (DPD) to compensate for nonlinear distortion that arises in Envelope Tracking (ET) Power Amplifiers (PAs) driven by slew-rate limited versions of the real signal's envelope. The slower version of the transmitted signal's envelope is used to cope with the slew-rate and bandwidth limitations of Envelope Amplifiers (EAs). Unfortunately, the use of slower versions of the real signal's envelope as the drain modulator generates a special kind of nonlinear memory effects. This paper shows experimental results that prove that is possible to compensate for these nonlinear memory effects that appear when exciting the supply of a RF linear PA with a slew-rate limited version of the envelope.
CitationMontoro, G., Gilabert, Pere L., Berenguer-Sau, J., Bertran, E. Digital predistortion of envelope tracking amplifiers driven by slew-rate limited envelopes. A: IEEE MTT-S International Microwave Symposium. "Proceedings IMS 2011". Baltimore: IEEE Microwave Theory and Techniques Society, 2011, p. 1-4.
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