Title :
A simple method to cut down configuration of feedforward power amplifier
Author :
Xiaowei Zhu ; Jianyi Zhou ; Wei Hong ; Hongxin Zhao
Author_Institution :
Lab. of Millimeter Waves, Southeast Univ., Nanjing, China
Abstract :
This paper describes a low cost and simple design method for feedforward linear power amplifier. The adaptive control techniques are employed in loop I to cancel carrier and extract error signal. In the loop II, the lookup table method of temperature correction is utilized for ensuring third-order intermodulation products (IMD/sub 3/) cancellation. The achievement has been realized in 460 MHz multicarrier power amplifier and CDMA base station power amplifier. The two-tone (IMD/sub 3/) are less than 62 dBc and the operation bandwidth is more than 20 MHz at 460 MHz. The ACPR of CDMA power amplifier is better than 40 dBc.
Keywords :
UHF power amplifiers; adaptive control; code division multiple access; digital communication; feedforward; intermodulation; table lookup; 20 MHz; 460 MHz; ACPR; CDMA base station power amplifier; adaptive control techniques; design method; error signal; feedforward power amplifier; linear power amplifier; lookup table method; multicarrier power amplifier; operation bandwidth; temperature correction; third-order intermodulation products; Adaptive control; Bandwidth; Base stations; Costs; Design methodology; Error correction; Multiaccess communication; Power amplifiers; Table lookup; Temperature;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.863300
