DocumentCode :
38848
Title :
CMOS Saturated Power Amplifier With Dynamic Auxiliary Circuits for Optimized Envelope Tracking
Author :
Sangsu Jin ; Kyunghoon Moon ; Byungjoon Park ; Jooseung Kim ; Yunsung Cho ; Hadong Jin ; Dongsu Kim ; Myeongju Kwon ; Bumman Kim
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea
Volume :
62
Issue :
12
fYear :
2014
fDate :
Dec. 2014
Firstpage :
3425
Lastpage :
3435
Abstract :
A CMOS saturated power amplifier (PA) is developed for optimally implementing the envelope-tracking (ET) transmitter. The CMOS saturated PA is used to maximize the efficiency of the ET PA. The dynamic feedback control and the biasing techniques at the gates of the common-gate stage and the common-source of the cascode structure are proposed to improve the dynamic range, linearity and efficiency. The fully-integrated CMOS PA with a supply modulator is fabricated using a 0.18- μm RF CMOS technology. For a long-term evolution signal at 1.85 GHz with a 10-MHz bandwidth and a 16-quadrature amplitude modulation 7.5 dB peak-to-average power ratio, the ET-based CMOS PA module delivers a power-added efficiency of 37.6%, an error vector magnitude of 2.4%, and an an evolved universal terrestrial radio access adjacent channel leakage ratio (ACLRE-UTRA) of -36.8 dBc at an average output power of 26.5 dBm. The proposed auxiliary circuits enable the ET-based CMOS PA to provide the significantly improved performance.
Keywords :
CMOS analogue integrated circuits; Long Term Evolution; UHF power amplifiers; quadrature amplitude modulation; radio access networks; 16-quadrature amplitude modulation; ACLRE-UTRA; CMOS saturated PA; CMOS saturated power amplifier; ET PA efficiency maximization; ET transmitter; ET-based CMOS PA; ET-based CMOS PA module; RF CMOS technology; auxiliary circuits; bandwidth 10 MHz; biasing technique; cascode structure common-source; common-gate stage; dynamic auxiliary circuits; dynamic feedback control; dynamic range improvement; efficiency 37.6 percent; envelope-tracking transmitter; error vector magnitude; frequency 1.85 GHz; fully-integrated CMOS PA; linearity; long-term evolution signal; optimized envelope tracking; peak-to-average power ratio; power-added efficiency; size 0.18 mum; supply modulator; universal terrestrial radio access adjacent channel leakage ratio; CMOS integrated circuits; Harmonic analysis; Linearity; Logic gates; Modulation; Power generation; Transistors; AM-to-AM; CMOS; bias circuit; cascode; class-AB; common-gate; differential; dynamic feedback; dynamic gate bias; dynamic range; efficiency; envelope tracking (ET); inter-modulation distortion (IMD); linear power amplifier; linearity; linearization; long term evolution (LTE); power amplifier (PA); saturated PA; self-bias; supply modulator; transmission line transformer (TLT);
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2014.2364584
Filename :
6954545
Link To Document :
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