Title :
A 1.9-GHz CMOS Power Amplifier Using Three-Port Asymmetric Transmission Line Transformer for a Polar Transmitter
Author :
Park, Changkun ; Kim, Younsuk ; Kim, Haksun ; Hong, Songcheol
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejon
Abstract :
A 1.9-GHz CMOS differential power amplifier for a polar transmitter is implemented with a 0.18-mum RF CMOS process. All of the matching components, including the input and output transformers, are fully integrated. The concepts of injection locking and variable load are applied to increase the efficiency and dynamic range of the amplifier. An asymmetric three-port transmission line transformer is proposed to embody the variable load effectively. The power amplifier achieved a power-added efficiency of 40% at a maximum output power of 32 dBm. The dynamic range was 20 dB at supply voltages ranging from 0.5 to 3.3 V. The improvement of the low power efficiency was 290% at an output power of 16 dBm
Keywords :
CMOS integrated circuits; UHF power amplifiers; radio transmitters; transformers; transmission lines; 0.18 micron; 0.5 to 3.3 V; 1.9 GHz; CMOS differential power amplifier; RF CMOS process; injection locking; polar transmitter; three-port asymmetric transmission line transformer; CMOS process; Differential amplifiers; Dynamic range; Injection-locked oscillators; Power amplifiers; Power generation; Power transmission lines; Radio frequency; Radiofrequency amplifiers; Transmitters; CMOS; Class-E; dynamic range; global system for mobile communication (GSM); injection locking; polar transmitter; power amplifier; transmission line transformer; variable load;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.889152
