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MMIC PAM applied with pre‐distorter having independent operation of nonlinear signal
Author(s) -
Oh InnYeal,
Kim KiByoung,
Ra KeukHwan,
Park ChulSoon
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23235
Subject(s) - amplifier , electrical engineering , wibro , linearity , heterojunction bipolar transistor , engineering , electronic engineering , predistortion , linearizer , wireless broadband , wireless , cmos , telecommunications , transistor , voltage , wireless network , bipolar junction transistor
A dynamic pre‐distorter with two paths to set nonlinear signal level and phase encourages power amplifier module (PAM) for wireless broadband (Wibro) service to enhance linearity. We proposed a linearizer having a new IM generator, which is made up of the InGaP/GaAs HBT operated at saturation region of a common collector circuit. The targeted Wibro PAM is designed using InGaP/GaAs HBT technology, and the pre‐distorter, drive and power amplifier are fully integrated in single chip within 960 × 2400 μm. Even though PAM is designed to have just a 5‐dB back‐off, PAM is compatible with linearity standards up to maximum output power 21 dBm, and has a 17.5% efficiency by having a low leakage and improving spurious of 6 dB in the 64QAM form based on IEEE802.16e‐2005 standards. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 851–855, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23235