Digital Polar CMOS Power Amplifier Researches in KAIST

被引:0
|
作者
Choi, Hyunseok [1 ]
Lee, Yumi [1 ]
Park, Jinseok [1 ]
Hong, Songcheol [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Elect Engn, Daejeon 305701, South Korea
来源
2015 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC), VOLS 1-3 | 2015年
关键词
CMOS RF power amplifier (PA); digitally modulated power amplifier (DPA); multimode; multiband; reconfigurable matching network; dynamic range; Tx power control; back-off power efficiency; WCDMA;
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
Integrated circuit researches in KAIST in the area of digital polar CMOS power amplifiers (DPAs) are presented, which include a high dynamic range DPA, and a dual-power-mode output matching network for a DPA to improve low power efficiency. The high dynamic range DPA introduces the sub-amplifier cell array with LO leakage canceller to improve local oscillator (LO) leakage and a digitally controlled bias generator for transmit power control. The DPA demonstrates the output dynamic range of 102.8 dB and the digital transmit-power control (TPC) range for the WCDMA signal of 49.7 dB without the external components such as variable gain amplifier and variable attenuator. We also proposed a dual-power-mode output matching network using the switched transformer for a DPA to improve low power efficiency. The efficiency at 16 dBm is improved from 8% to 13% by using the output matching network. the DPA reconstruct 27.9-dBm WCDMA signals at 1.95 GHz with 31% efficiency.
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页数:3
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