1. [1] D.A. Teeter, E.T. Spears, H.D. Bui, H. Jiang, and D. Widay, “Average current reduction in (W)CDMA power amplifiers,” IEEE Radio Freq. Integr. Symp. Dig., pp.429-432, 2006.
2. [2] K. Mukai, S. Shinjo, K. Yamanaka, M. Miyashita, and K.Yamamoto, “A dual-gain-mode high efficiency power amplifier for W-CDMA data communications,” Proc. Asia-Pacific Microw. Conf., pp.671-673, 2014.
3. [3] K. Yamamoto, T. Matsuzuka, M. Miyashita, K. Maeda, S. Suzuki, and H. Seki, “0.8-/1.5-GHz-band WCDMA HBT MMIC power amplifiers with an analog bias control scheme,” IEICE Trans. Electron., vol.E98-C, no.9, pp.934-945, Sept. 2015.
4. [4] T. Apel, T. Henderson, Y.-L. Tang, and O. Berger, “Efficient three-state WCDMA PA integrated with high performance BiHEMT HBT/E-D pHEMT process,” IEEE Radio Freq. Integr. Symp. Dig., pp.149-152, 2008.
5. [5] Y. Kwon, J.-H. Kim, and S.-H. Jung, “Low-power PAE enhancement for 3G handset power amplifiers,” IEEE MTT-S Int. Microw. Symp., Workshop, WSF-5, 2009.