NDLI: A predistortion linearizer using a tunable resonator

Content Provider	IEEE Xplore Digital Library
Author	Gupta, N. Tombak, A. Mortazawi, A.
Copyright Year	2001
Abstract	In this letter, a novel predistortion topology using a tunable resonator is presented. The core of the circuit is a series tunable resonator employing a reverse biased varactor diode. The junction capacitance of the varactor diode increases with RF input power, effectively shifting the resonant frequency of the circuit. This results in the amplitude and phase deviations at the frequency of operation. A 1.8-GHz power amplifier (PA), with a gain of 9 dB and 21-dBm output power, is linearized based on this technique. A maximum of 11 dB improvement in adjacent channel power ratio and an increase in 1.8 dB for the compression point is measured for the linearized PA.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	431
Ending Page	433
Page Count	3
File Size	247067
File Format	PDF
ISSN	15311309
Volume Number	14
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Predistortion Tunable circuits and devices Varactors Diodes Power amplifiers Circuit topology Capacitance Radio frequency Resonant frequency RLC circuits
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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A predistortion linearizer using a tunable resonator