Wideband Envelope Amplifier for Envelope-Tracking Operation of Handset Power Amplifier

被引：0
|
作者：
Kim, Jooseung [1 ]
Kim, Dongsu [2 ]
Cho, Yunsung [1 ]
Kang, Daehyun [3 ]
Jin, Sangsu [1 ]
Park, Byungjoon [1 ]
Moon, Kyunghoon [1 ]
Jin, Hadong [1 ]
Koo, Seungbeom [1 ]
Kim, Bumman [1 ]
机构：
[1] POSTECH, Pohang Univ Sci & Technol, Dept Elect Engn, Pohang, South Korea
[2] Samsung Elect, Suwon 443742, Gyeonggi, South Korea
[3] Broadcom Corp, Matawan, NJ 07747 USA
来源：
2014 44TH EUROPEAN MICROWAVE CONFERENCE (EUMC) | 2014年
关键词：
D O I：
暂无
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 wideband envelope amplifier for envelope-tracking operation of handset power amplifiers. The amplifier has a combined structure composed of a linear regulator and a switching converter. A low output impedance class-AB push-pull output stage is employed to expand the bandwidth (BW) of the linear regulator. By reducing the output resistance of the source follower using dual shunt feedbacks, a nondominant pole at the gate of the output buffer is pushed to the higher frequency range. The gain BW product (GBW) of the linear regulator is improved without sacrificing the phase margin (PM) and efficiency. The designed linear regulator achieves the GBW of 129.6-MHz and PM of 73.1 degrees. For a 40-MHz long term evolution signal having a peak-to-average power ratio of 7.4 dB, the envelope amplifier delivers an efficiency of 73.6% at the peak power driving a 7.7 Omega resistive load.
引用
收藏
页码：1352 / 1355
页数：4
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