Wideband high efficiency multi-band, multi-mode (LTE/WCDMA/GSM) power amplifier for mobile terminals

Based upon a unique Junction PHEMT device, a low voltage ultra-wideband high efficiency power amplifier has been realized for multi-band, multi-mode (LTE/WCDMA/GSM) mobile terminals. To the best of the authors´ knowledge, it is currently the widest frequency range multi-mode PA available for such applications -with the ability to cover 698-915MHz with just one “Low-Band” PA for all possible band allocations below 1GHz. A similar “High-Band” PA was able to cover many of the mobile bands above 1GHz: 1710-2050MHz with the ability to also support the 3GPP 1400MHz band. Despite the wide bandwidth, a high efficiency level -of a similar order to the best-in-class conventional narrow-band PAs, was achieved. Furthermore, it is shown that the architecture deployed has a number of additional powerful benefits compared with conventional PAs such as the ability to provide higher efficiency across the typical HSPA and LTE transmit power distribution characteristics and also the ability to integrate post-PA components such as switches onto the same PA due to the characteristically high output impedance associated with the architecture.