Adaptively preserving power amplifier linearity under antenna mismatch

Adrianus van Bezooijen, Reza Mahmoudi, Arthur H.M. van Roermund

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

24 Citations (Scopus)


An adaptive method is proposed to preserve power amplifier linearity under severe antenna mismatch condition, as an alternative to an isolator. At high output power and mismatch conditions voltage clipping, due to collector voltage saturation of the bipolar power transistor, is demonstrated to be the main cause of distortion. Linearity degradation can be properly monitored by minimum voltage detection, which is used adaptively to control the gain of a pre-amplifier in order to prevent collector voltage clipping. Measurement results demonstrate a significant linearity improvement under severe mismatch conditions. For an EDGE power amplifier an EVM improvement of 5% and an ACPR improvement of 10dB have been obtained at 28.5 dBm output power and a VSWR of 4:1.
Original languageEnglish
Title of host publicationIEEE MTT-S Int. Microwave Symposium Digest
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages4
ISBN (Print)0-7803-8331-1
Publication statusPublished - 2004
Event2004 IEEE Radio Frequency Integrated Circuits Symposium (RFIC 2004) - Forth Worth, United States
Duration: 6 Jun 20048 Jun 2004


Conference2004 IEEE Radio Frequency Integrated Circuits Symposium (RFIC 2004)
Abbreviated titleRFIC 2004
Country/TerritoryUnited States
CityForth Worth


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