A Hybrid Envelope Modulator Using Feedforward Control for OFDM WLAN Polar Transmitter

被引：0
|
作者：
Lee, Chih-Chang [1 ]
Chen, Chun-Jen [1 ]
Wu, Szu-Hsien [1 ]
机构：
[1] Ind Technol Res Inst, SoC Technol Ctr, Hsinchu 310, Taiwan
来源：
RFIC: 2009 IEEE RADIO FREQUENCY INTEGRATED CIRCUITS SYMPOSIUM | 2009年
关键词：
POWER-AMPLIFIER;
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 feedforward control for hybrid envelope modulator for applications in 802.11g OFDM VVLAN polar transmitter. The feedforward control is constituted by hysteresis comparator and duplicate-linear amplifier that possess low power dissipation. For achieving high speed and high efficiency, the hybrid envelope modulator combines with a linear amplifier and a switch amplifier. Operational transconductance amplifier (OTA) and class-AB output stage are designed for linear amplifier as well as the buck converter is designed for switch amplifier. The chip has been fabricated in 0.35 mu m SiGe process and occupies an area of 2 mm(2) including 1/0 pads. The die is packaged in LQFP and measurement results show that the output voltage range is from 0 to 3V under 3.8V power supply and drives a 5 Omega load up to 1.8W of maximum output power with 95% of maximum efficiency.
引用
收藏
页码：123 / 126
页数：4
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