MMIC PAM applied with pre-distorter having independent operation of nonlinear signal

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...

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Bibliographic Details
Published in:Microwave and optical technology letters 2008-04, Vol.50 (4), p.851-855
Main Authors: Oh, Inn-Yeal, Kim, Ki-Byoung, Ra, Keuk-Hwan, Park, Chul-Soon
Format: Article
Language:English
Subjects:
independence operation
inter-modulation generator
linear power amp
pre-distorter
Wibro
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Summary: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
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.23235