Title :
An envelope elimination and restoration power amplifier using a CMOS dynamic power supply circuit
Author :
Chen, Jau-Horng ; U-yen, Kongpop ; Kenney, J. Stevenson
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper presents a CDMA power amplifier using Kahn envelope elimination and restoration technique. A CMOS delta-modulated envelope amplifier with over 3MHz bandwidth is used as the dynamic power supply. Internal feedback was used on the envelope amplifier to reduce delay. A commercially available 1W GaAs/AlGaAs HFET power amplifier was tested in conjunction with the envelope amplifier. Using an IS-95 CDMA signal, a peak output power of 25 dBm was obtained at 836 MHz while achieving a maximum efficiency of 48% with ACPR of 47.9 dBc.
Keywords :
CMOS integrated circuits; circuit feedback; code division multiple access; field effect transistors; gallium compounds; microwave power amplifiers; power supply circuits; 1 W; 3 MHz; 48 percent; 836 MHz; AlGaAs; CDMA power amplifier; CMOS; GaAs; HFET power amplifier; IS-95 CDMA signal; Kahn envelope elimination; delay reduction; delta-modulated envelope amplifier; dynamic power supply circuit; envelope restoration; internal feedback; Bandwidth; CMOS technology; Circuits; Delay; Feedback; Gallium arsenide; HEMTs; Multiaccess communication; Power amplifiers; Power supplies;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1338866
