Browsing by Author "Lai, Chung-Min"

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A Polar Modulated Tri-band Power Amplifier Using Flexible Substrate Based MEMS Switches
(2010-01-01)
Lai, Chung-Min
;
Chao, Tzu-Yuan
;
Tsou, Wen-An
;
Chou, Mei-Fen
;
Cheng, Yu-Ting
In this work, the phase compensation techniques by means of self-biasing control and an additional tuning capacitor for polar modulated tri-band Class-E power amplifier is proposed. The tri-band power amplifier operating at 2.3 similar to 2.7/3.3 similar to 3.8/5.1 similar to 5.8 GHz for WLAN and WiMAX applications adjusts low loss Micro-Electro-Mechanical-Systems (MEMS) switches to select the matching networks. The improvement of phase distortion and system relative constellation error (RCE) is 36.4 degrees and 8.9dB, respectively. Simulation results shows that the maximum power-added efficiency (PAE) of 34.9%, drain efficiency of 37.3%, and output power of 18.8dBm from 2.8V supply can be achieved in 0.18 mu m CMOS Technology.
TRI-BAND CMOS CLASS-E POWER AMPLIFIER DESIGN WITH PHASE COMPENSATIONS FOR POLAR SYSTEMS
(2010)
Lai, Chung-Min
;
Tsou, Wen-An
;
Chou, Mei-Fen
;
Wen, Kuei-Ann
;
電子工程學系及電子研究所
A 0.18 mu m CMOS fully integrated cascode Class-E power amplifier operating in 2.5GHz/3.5GHz/5.2GHz frequency bands for polar transmitters has been proposed. The tri-band amplification is achieved by adaptation of the common-gate transistor size and the matching networks. The phase distortion from supply modulation of the Class-E is compensated by controlling the common-gate transistor gate voltage and a compensative capacitor. Simulation results show that the maximum power-added efficiency (PAE) of 30.4%, drain efficiency of 34% and output power of 18.8dBm from 2.8V supply can be achieved. The phase distortion can be compensated from 34.4 degrees to 3.1 degrees under supply voltage of 0.5V to 2.8V. A system co-simulation has been established for relative constellation error (RCE) evaluation and it reveals that the RCE can be improved from -23.3dB to -31.4dB in 3.5GHz frequency band.