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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Oishi, K. Yoshida, E. Sakai, Y. Takauchi, H. Kawano, Y. Shirai, N. Kano, H. Kudo, M. Murakami, T. Tamura, T. Kawai, S. Yamaura, S. Suto, K. Yamazaki, H. Mori, T. |
| Copyright Year | 2014 |
| Description | Author affiliation: Fujitsu Semicond., Yokohama, Japan (Shirai, N.; Kano, H.; Kudo, M.; Murakami, T.; Tamura, T.; Kawai, S.; Yamaura, S.; Suto, K.) || Fujitsu Labs., Kawasaki, Japan (Oishi, K.; Yoshida, E.; Sakai, Y.; Takauchi, H.; Kawano, Y.; Yamazaki, H.; Mori, T.) |
| Abstract | In recent years, the demand for low cost and system-on-a-chip for mobile terminals has led to the development of a highly-integrated, low-distortion, and high-power-efficiency CMOS power amplifier (PA). To improve the power efficiency of the conventional linear PA [1-4], an envelope tracking (ET) technique, which modulates supply voltage of a linear PA, has attracted attention. However, the published power efficiency, gain and output power are not sufficient for LTE applications [5], and its typical implementation requires an external supply modulator that is a high-speed power supply circuit [6]. Envelope elimination and restoration (EER) is an alternative supply modulation technique that can further improve the power efficiency over ET by replacing the linear PA with a switching PA driven by a phase signal [7]. However, to meet the specified low distortion, especially for LTE with a wide bandwidth baseband signal, an EER PA generally has difficulty achieving a wide bandwidth for the phase signal path, and requires a high-speed supply modulator, and highly accurate timing between envelope and phase signals. To overcome these problems, this paper introduces an envelope / phase generator based on a mixer and a timing aligner based on a delay-locked loop. Additionally, they were integrated with a switching PA and a supply modulator on the same die. |
| Starting Page | 60 |
| Ending Page | 61 |
| File Size | 2744934 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781479909186 |
| ISSN | 01936530 |
| e-ISBN | 9781479909209 |
| DOI | 10.1109/ISSCC.2014.6757337 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-02-09 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Power amplifiers Delays CMOS integrated circuits Multiaccess communication Spread spectrum communication Bandwidth |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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