An IC for linearizing RF power amplifiers using envelope elimination and restoration

被引:131
作者
Su, DK [1 ]
McFarland, WJ [1 ]
机构
[1] Hewlett Packard Labs, Palo Alto, CA 94304 USA
关键词
delta modulation; envelope detector; envelope elimination and restoration; limiter; RF power amplifier linearization; switching power supply; variable gain amplifier;
D O I
10.1109/4.735710
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents a monolithic CMOS implementation of an envelope elimination and restoration Linearization system that improves the linearity of efficient radio-frequency power amplifiers. The linearization IC, which occupies 4.3 mm(2) when implemented in a 0.8-mm CMOS technology, consists of a limiter, envelope detectors, and delta-modulated switching power supply, This circuit was used to linearize advanced mobile phone system cellular power amplifiers transmitting North American digital cellular (NADC) waveforms, Measurements show that the linearized outputs meet the spectral mask and phase distortion requirements of NADC, The linearization system can improve the overall efficiency from 36 to 49% while increasing the maximum linear output power from 26.5 to 29.5 dBm.
引用
收藏
页码:2252 / 2258
页数:7
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