Title :
Design of feedforward linear power amplifier
Author :
Liang, Liao ; Qing-xin, Chu ; Qing-Feng, Zeng
Author_Institution :
Coll. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
This paper describes a control way of adaptive + lookup table for feed forward power amplifier, which can be used in the system of cdma 2000. Steepest descent algorithm is used for the control of the first loop, in the second loop we use the method of look up table, which is relevant with temperature. The amplifier´s output is 45dBm, its IMD3 are less than -62 dBc. Test it with the signal of cdma 2000, we can see its ACPR is better than -54dB@750kHz, -71dB@1.98MHz.
Keywords :
HF amplifiers; adaptive control; feedforward; network synthesis; power amplifiers; table lookup; 1.98 MHz; 750 kHz; feedforward linear power amplifier; lookup table; steepest descent algorithm; Attenuators; Circuits; Communication system control; Delay lines; Feeds; Nonlinear distortion; Power amplifiers; Power engineering and energy; Power generation; Radiofrequency amplifiers;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2004. ICMMT 4th International Conference on, Proceedings
Print_ISBN :
0-7803-8401-6
DOI :
10.1109/ICMMT.2004.1411581
