NDLI: Linearity of X-band Class-E Power Amplifiers in a Digital Polar Transmitter

Content Provider	IEEE Xplore Digital Library
Author	Narisi Wang Lopez, N.D. Yousefzadeh, V. Hoversten, J. Maksimovic, D. Popovic, Z.
Copyright Year	2007
Description	Author affiliation: Colorado Univ., Boulder (Narisi Wang; Lopez, N.D.; Yousefzadeh, V.; Hoversten, J.; Maksimovic, D.; Popovic, Z.)
Abstract	This paper discusses the linearity of a class-E X-band PA in a digital polar transmitter. The PA is nonlinear since it is compressed by 2.2 dB when achieving a 59% PAE at 10 GHz. Load-pull is performed under a two-tone test and the resulting optimal efficiency impedance is found to be over 30% different from the single-tone load-pull. In addition standard two-tone load-pull measurements indicate that the impedance for max $P_{out}$ coincide with worst nonlinearity (IMD). Surprisingly, in the two-tone polar load-pull, impedance for max $P_{out}$ differs significantly from the impedance corresponding to worst IMD. Therefore, under polar modulation a different matching circuit should be designed for optimal linearity and efficiency. The PA is part of a digital polar transmitter which enables linearization including phase predistortion, with IMD levels over 11 dB lower than in the standard two-tone test. Load-pull performed on the polar class-E PA shows that the level of intermodulation products varies for different signals input into the PA.
Starting Page	1083
Ending Page	1086
File Size	1550635
Page Count	4
File Format	PDF
ISBN	1424406870
ISSN	0149645X
DOI	10.1109/MWSYM.2007.380281
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Linearity Power amplifiers Transmitters Impedance Radiofrequency amplifiers Circuits Radio frequency MESFETs Digital control Frequency conversion class-E amplifier Envelope elimination and restoration polar modulation envelope amplifier
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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