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A CMOS RF Power Amplifier Using an Off-Chip Transmision Line Transformer With 62% PAE

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4 Author(s)
Jaemin Jang ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon ; Changkun Park ; Haksun Kim ; Hong, S.

In this letter, a two-stage 900-MHz CMOS differential power amplifier (PA) is designed and implemented in a 0.18-mum radio frequency CMOS process. A transmission line transformer on a printed circuit board is used as an output power combiner and matching circuits of a class-E power stage. To drive the power stage effectively, cascaded class-D amplifiers are used as driver amplifiers. The PA delivers an output power of 31.7dBm and a power-added efficiency of 62.4% with a power gain of 30.3dB, including the losses of the bond-wires and the output transformer

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:17 ,  Issue: 5 )