An adaptive predistortion RF power amplifier with a spectrum monitor for multicarrier WCDMA applications

This paper presents an adaptive predistortion RF power amplifier for repeater systems with a spectrum monitor. For adaptive control of cancellation, we implement a spectrum monitor that improves the adjacent channel leakage ratio (ACLR) characteristics of the power amplifier by analyzing the output...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-02, Vol.53 (2), p.786-793
Main Authors: LEE, Seung-Yup, LEE, Yong-Sub, HONG, Seung-Ho, CHOI, Hyun-Sik, JEONG, Yoon-Ha
Format: Article
Language:English
Subjects:
Adaptive
Adaptive control
Adaptive systems
adjacent channel leakage ratio (ACLR)
Algorithms
Amplifiers
Applied sciences
Broadband amplifiers
Channels
Circuit properties
Code Division Multiple Access
Electric potential
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
linearity
Monitoring
Monitors
Multiaccess communication
Optimization
power amplifier
Power amplifiers
Power measurement
predistorter (PD)
Predistortion
Radio frequencies
Radio frequency
Radiofrequency amplifiers
Repeaters
spectrum
wide-band code division multiple access (WCDMA)
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Summary:This paper presents an adaptive predistortion RF power amplifier for repeater systems with a spectrum monitor. For adaptive control of cancellation, we implement a spectrum monitor that improves the adjacent channel leakage ratio (ACLR) characteristics of the power amplifier by analyzing the output spectrums of RF power amplifiers directly and simultaneously. For experimental validation, we also implement a class-AB RF power amplifier that adopts a predistortion linearizer with the spectrum monitor and measure the characteristics for the wide-band code division multiple access (WCDMA) band. With an optimum gate bias voltage of the power amplifier, ACLRs of 22 and 20.5 dB are improved for the cases of one- and four-carrier WCDMA applications, respectively. The predistortion power amplifier with the spectrum monitor delivers a P out of 37.5 dBm with an ACLR of -45 dBc for four-carrier WCDMA applications. Furthermore, excellent ACLR characteristics are consistently maintained with the minimization algorithm by adaptively controlling the vector modulator in the predistorter under various environments that include varying input power levels, temperatures, and operating frequencies
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2004.841222