ETRI Journal | |
Fully Integrated HBT MMIC Series-Type Extended Doherty Amplifier for W-CDMA Handset Applications | |
关键词: series-type Doherty amplifier; predistorter; MMIC; integration; extended Doherty concept; Doherty amplifier; | |
Others : 1186006 DOI : 10.4218/etrij.10.0209.0360 |
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【 摘 要 】
A highly efficient linear and compactly integrated series-type Doherty power amplifier (PA) has been developed for wideband code-division multiple access handset applications. To overcome the size limit of a typical Doherty amplifier, all circuit elements, such as matching circuits and impedance transformers, are fully integrated into a single monolithic microwave integrated circuit (MMIC). The implemented PA shows a very low idle current of 25 mA and an excellent power-added efficiency of 25.1% at an output power of 19 dBm by using an extended Doherty concept. Accordingly, its average current consumption was reduced by 51% and 41% in urban and suburban environments, respectively, when compared with a class-AB PA. By adding a simple predistorter to the PA, the PA showed an adjacent channel leakage ratio better than -42 dBc over the whole output power range.
【 授权许可】
【 预 览 】
Files | Size | Format | View |
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20150520120536727.pdf | 418KB | download |
【 参考文献 】
- [1]J.F. Sevic "Statistical Characterization of RF Power Amplifier Efficiency for CDMA Wireless Communication Systems," Wireless Commun. Conf., 1997, pp. 110-113.
- [2]Y. Lee, M. Lee, and Y. Jeong, "Highly Linear and Efficient Microwave GaN HEMT Doherty Amplifier for WCDMA," ETRI J., vol. 30, no. 1, Feb. 2008, pp. 158-160.
- [3]J. Kim et al., Series-Type Doherty Amplifier without Hybrid Coupler, US Patent 7,164,316, Jan. 16, 2007.
- [4]C. Koo et al., "A Linearity Enhanced Compact Series-Type Doherty Amplifier Suitable for CDMA Handset Applications," IEEE Radio Wireless Symp., Jan. 2007, pp. 317-320.
- [5]M. Iwamoto et al., "An Extended Doherty Amplifier with High Efficiency over a Wide Power Range," IEEE Trans. Microw. Theory Tech., vol. 49, no. 12, Dec. 2001, pp. 2472-2479.
- [6]Y. Zhao et al., "Linearity Improvement of HBT-Based Doherty Power Amplifiers Based on a Simple Analytical Model," IEEE Trans. Microw. Theory Tech., vol. 54, no. 12, Dec. 2006, pp. 4479-4488.