A fully integrated triple-band CMOS hybrid-EER transmitter for WCDMA/LTE applications

This paper presents a fully integrated triple-band CMOS hybrid-EER transmitter for WCDMA/LTE applications. The operation frequency bands are 0.8/2.3 GHz for LTE and 1.9 GHz for WCDMA applications with multi-band class-E power amplifier (PA) using a power cell resizing technique and a multitap transformer. The multi-mode envelope amplifier support 3.84-MHz WCDMA and 5-MHz LTE signal with a dual-switching stage for high efficiency. The PA and envelope amplifier are integrated in a single chip using CMOS process with input/output matching networks. To compensate the nonlinearity of the supply modulated transmitter, the on-chip linearizer is design on a chip. The transmitter achieves output powers of 23/26/22 dBm and power-added efficiency of 27/33/23 % at each frequency band. The transmitter is implemented in a 0.18 μm CMOS process. The total chip size is 1.6 × 2.5 mm².