A switchless reconfigurable transformer CMOS power amplifier

IEICE Electronics Express

Jaesang Cha¹  Kyu Hwan An²  Ockgoo Lee²  Juphil Cho³ 

[1] School of Electronic and IT Media Engineering, Seoul national university of science & technology;Qualcomm Inc.;Department of Radiocommunication Engineering, Kunsan national university

关键词: power amplifier (PA);    transformer;    passive efficiency;    impedance transformation;    low-power mode;   

DOI  :  10.1587/elex.9.855

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)Cited-By(2)A reconfigurable dual-mode monolithic transformer is presented, which avoids the use of switches for load adaptation. The number of turns of primary winding is varied according to power mode control so that load impedance can be optimized for each operation. The concept of the reconfigurable transformer is demonstrated through the design of a multi-mode power amplifier using bulk CMOS process. Electromagnetic and circuit simulation results validate the operation and performance improvements using the proposed transformer. Low power efficiency at 18dBm is substantially improved from 5.5% to 17.5% using multi-mode control.

【 授权许可】

Unknown