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J Electromagn Eng Sci > Volume 14(1); 2014 > Article
Journal of Electromagnetic Engineering and Science 2014;14(1):1-8.
DOI: https://doi.org/10.5515/JKIEES.2014.14.1.1   
CMOS Linear Power Amplifier with Envelope Tracking Operation (Invited Paper)
Byungjoon Park1, Jooseung Kim2, Yunsung Cho1, Sangsu Jin2, Daehyun Kang3, Bumman Kim2
1Division of Information Technology Convergence Engineering, Pohang University of Science and Technology (POSTECH)
2Department of Electrical Engineering, POSTECH
3Broadcom Corporation
Abstract
A differential-cascode CMOS power amplifier (PA) with a supply modulator for envelope tracking (ET) has been implemented by 0.18 ${mu}m$ RF CMOS technology. The loss at the output is minimized by implementing the output transformer on a FR-4 printed circuit board (PCB). The CMOS PA utilizes the $2^{nd}$ harmonic short at the input to enhance the linearity. The measurement was done by the 10MHz bandwidth 16QAM 6.88 dB peak-to-average power ratio long-term evolution (LTE) signal at 1.85 GHz. The ET operation of the CMOS PA with the supply modulator enhances the power-added efficiency (PAE) by 2.5, to 10% over the stand-alone CMOS PA for the LTE signal. The ET PA achieves a PAE of 36.5% and an $ACLR_{E-UTRA}$ of -32.7 dBc at an average output power of 27 dBm.
Key words: CMOS, Envelope Tracking, Long-Term Evolution, Power Amplifier, Supply Modulator
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