RFIC Design of Highly-Efficient Broadband Polar Transmitters for WiMAX and 3GPP LTE Applications
This paper presents highly-efficient RF polar transmitter (TX) systems that utilize the envelopetacking (ET) technique with monolithic SiGe power amplifiers (PAs) for mobile WiMAX and 3GPP Long Term Evolution (LTE) applications. Monolithic single-ended cascode SiGe PA design capable of enhancing its power-added efficiency (PAE) is demonstrated. Four RF switches are adopted at the bases of the commonemitter transistors, which can be turned on/off in response to the desired output power. We found that self-biasing of the common-base device with ET can improve the output distortion of the cascode PA to output 18dBm and passing the stringent mobile WiMAX linearity specs with 30％ PAE at 2.3GHz without predistortion. Furthermore, a differential cascode SiGe PA using the proposed ET-based polar TX system can improve the average output power to 21dBm with 33.6％ PAE at 1.42 GHz, and it also passes the stringent LTE 16QAM linearity specs without needing predistortion.
D.Y.C. Liev Y. Li J. Lopez K. Chen S. Wu T. Y. Yang
Electrical and Computer Engineering Dept., Texas Tech University, Lubbock, TX, USA Information & Communications Research Labs, Industrial Technology Research Institute (ITRI), Hsinchu
国际会议
上海
英文
150-153
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）