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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Joon Hyung Kim Gwan Do Jo Jung Hoon Oh Young Hoon Kim Kwang Chun Lee Jae Ho Jung |
| Copyright Year | 2011 |
| Description | Author affiliation: Electronics and Telecommunications Research Institute (ETRI), 138 Gajeong-ro, Yuseong, Daejeon, Republic of Korea (Joon Hyung Kim; Gwan Do Jo; Jung Hoon Oh; Young Hoon Kim; Kwang Chun Lee; Jae Ho Jung) |
| Abstract | This paper presents a 1.5 bit (3-level) envelope amplifier to improve the overall efficiency of wideband high linearity envelope tracking power amplifier. The proposed envelope amplifier has been devised with two switches providing the different supply voltages. Since the unnecessary current (ripple current) induced by a switching stage can be reduced by the multi-level quantization, the efficiency of a proposed envelope amplifier is 5% higher compared with that of a conventional architecture. With the proposed envelope amplifier, we have designed and implemented the 3.54GHz high efficiency envelope tracking power amplifier using a commercial 60W PEP GaN device. The efficiency boosting effect is further verified by the measured results. The experiment results show that the envelope tracking power amplifier operates at drain efficiency (DE) of 43.6% and power added efficiency (PAE) of 39.2% and a gain of 10.1dB at average output power of 40 dBm for a 10MHz WiMAX signal with 8.5 dB peak-to-average power ratio (PAPR). By using digital predistortion function, the adjacent channel leakage ratio (ACLR) is less than −45.4dBc at 20MHz offset. |
| Starting Page | 21 |
| Ending Page | 24 |
| File Size | 262783 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424484164 |
| e-ISBN | 9781424484157 |
| DOI | 10.1109/PAWR.2011.5725371 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-01-16 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Radio frequency Envelope tracking Digital pre-distortion Transmitters Power amplifiers Switches Peak to average power ratio WiMAX Quantization Envelope amplifier Power amplifier |
| Content Type | Text |
| Resource Type | Article |
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