High-Power Amplifier Linearization Using the Doherty Amplifier as a Predistortion Circuit

This paper presents the application of a Doherty power amplifier (DPA) as a predistortion circuit for the linearization of high PA. When the DPA is employed as the driver amplifier, its nonlinearity is used as predistorted components to cancel the strong nonlinearity of the main amplifier. To verify...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2008-09, Vol.18 (9), p.611-613
Main Authors: LEE, Yong-Sub, LEE, Mun-Woo, JEONG, Yoon-Ha
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Broadband amplifiers
Channels
Circuit properties
Circuit testing
Circuits
Doherty amplifier
Driver circuits
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
FETs
High power amplifiers
Intermodulation
intermodulation distortion (IMD)
linearity
Linearization
Metal oxide semiconductors
MOS devices
Multiaccess communication
Nonlinearity
power amplifier (PA)
Predistortion
Semiconductor device testing
Semiconductors
Silicon
wideband code-division multiple access (WCDMA)
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Summary:This paper presents the application of a Doherty power amplifier (DPA) as a predistortion circuit for the linearization of high PA. When the DPA is employed as the driver amplifier, its nonlinearity is used as predistorted components to cancel the strong nonlinearity of the main amplifier. To verify the proposed method, the DPA is implemented with two 30-W silicon metal-oxide semiconductor field-effect transistors and tested with a 180-W main amplifier at a wideband code-division multiple access (WCDMA) band of 2.14 GHz. For a two-tone signal with 2-MHz tone spacing and a one-carrier WCDMA signal, the significant cancellation of the third- and fifth-order intermodulation (IM3 and IM5) components and a superior adjacent channel leakage ratio improvement are achieved.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2008.2002461