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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 51783 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Safarian, Amin Ghasem; Fotowat Ahmadi, Ali
- Abstract:
- Efficient radio frequency (RF) power amplifiers (PAs) are critical in portable battery-operated wireless communication systems because they can dominate the power consumption. Linear amplifiers are enough linear but suffer from poor efficiency. On the other hand, switching power amplifier are efficient but are nonlinear and just amplify constant envelope signals. Two conventional methods for increasing transmitter efficiency and linearity are envelope elimination and restoration (EER) and envelope tracking (ET). In both methods, supply modulator controls RF power amplifier supply based on the signal envelope. Efficiency and bandwidth are critical factors in supply modulator. Thus hybrid structures including a wideband linear amplifier and an efficient switching amplifier are used as conventional supply modulator. In this project, a wideband efficient supply modulator is designed in 180 nm CMOS technology for WLAN IEEE 802.11g OFDM. The bandwidth of the designed supply modulator is 20 MHz and the peak of the output power and the maximum efficiency are 26 dBm and 89.3% respectively. In the proposed modulator circuit, 10 dB back-off efficiency is 10% more compared to the conventional circuit
- Keywords:
- Power Amplifier ; Power Amplifier (PA) ; Efficiency ; Bandwidth ; Envelope Elimination and Restoration (EER) ; Envelope Tracking (ET)
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