A hybrid envelope amplifier with switching-controlled structure for EDGE/WCDMA/LTE reconfigurable transmitters

This paper presents a new type of the hybrid envelope amplifier (HEA) using a switching-controlled structure for reconfigurable transmitters. The dual switching stage, controlled by an appropriate voltage with respects to the selected mode, is employed to obtain high efficiency. For verification, the proposed HEA has been fabricated using 0.35-µm CMOS technology within an area of 2.3 × 1.1 mm² including all of the pads. The maximum efficiency of 85%, 84% and 79%, which are approximately 9%, 6% and 5% higher than those of the conventional HEA, are achieved for EDGE, WCDMA, and LTE modes, respectively.