Title :
A Reconfigurable Quad-Band CMOS Class E Power Amplifier for Mobile and Wireless Applications
Author :
Kim, Ki Young ; Kim, Woo Young ; Son, Hyuk Su ; Oh, Inn Yeal ; Park, Chul Soon
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci ence & Technol. (KAIST), Daejeon, South Korea
fDate :
7/1/2011 12:00:00 AM
Abstract :
This paper proposes a new design technique for a reconfigurable CMOS Class E power amplifier (PA) by selectively activating the transistor cells in the array of power transistors. The activated transistors will be used for amplification and the non-activated transistors will be used for input/output matching and switching capacitance for Class E operation. The quad-band PA for 1.9/2.3/2.6/3.5 GHz has been implemented in a 0.18 μm CMOS technology using the technique without any switch or tunable circuit. This PA obtains output powers of 24.2/23.8/23.4/ 20.5 dBm and efficiency of 48.2/44.3/40.9/35.6% at 1.9/2.3/2.6/ 3.5 GHz. The total MMIC chip size is as small as 0.92 × 1.75 mm2 for the reconfigurable quad-band operation.
Keywords :
CMOS integrated circuits; MMIC power amplifiers; microwave power transistors; MMIC chip size; efficiency 35.6 percent; efficiency 40.9 percent; efficiency 44.3 percent; efficiency 48.2 percent; frequency 1.9 GHz; frequency 2.3 GHz; frequency 2.6 GHz; frequency 3.5 GHz; input/output matching; mobile application; nonactivated transistor; power transistor; reconfigurable quad-band CMOS class E power amplifier; size 0.18 mum; switching capacitance; transistor cells; wireless application; CMOS integrated circuits; Capacitance; Impedance; Impedance matching; Power generation; Transistors; Turning; CMOS; Class E; monolithic microwave integrated circuit; multi-band; power amplifier (PA);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2152384
