Title :
Enhancement on the robustness of a quad-band power amplifier module for GSM/GPRS handsets
Author :
Wu, Janne-Wha ; Hu, Cheng-Chi ; Shih, Ying-Chou ; Tang, Ching-Wen ; Huang, Chung-Er ; Shen, Che-Wei
Author_Institution :
National Chung Cheng Univ., ChiaYi, Taiwan
Abstract :
Device ruggedness is the major concern about the adoption of power amplifier module in the mobile phone industry. A resistive network was employed to stabilize the sub-harmonic (f/2) loop oscillation for the large periphery device, especially on the output stage. Not only the spurious emission being minimized, but also the robustness of power amplifier is strengthened as operating under severe mismatch condition (VSWR 10:1). Such power chips were integrated with a logarithmic power detecting controller and functioned as a linearly closed-loop power controlled GSM/GPRS power amplifier module. It had successfully demonstrated a highly mismatch susceptibility for all quad-band operations (GSM850, EGSM900, DCS1800, PCS1900).
Keywords :
cellular radio; circuit stability; closed loop systems; mobile handsets; packet radio networks; power amplifiers; radiofrequency amplifiers; radiofrequency integrated circuits; GPRS handsets; GSM handsets; linear closed-loop power controlled power amplifier; logarithmic power detecting controller; mobile phones; power amplifier robustness; quad-band power amplifier module; severe mismatch condition; spurious emission; subharmonic loop oscillation; Diodes; GSM; Ground penetrating radar; Impedance; Mobile handsets; Power amplifiers; Power control; Radio frequency; Robustness; Telephone sets; GPRS; GSM; HBT; Mismatch Susceptibility; Power Amplifier Module; Power Control; Robustness;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1607091
