Title :
An advanced 2 watt high power amplifier for CDMA 900 MHz system
Author :
Kim, T.H. ; Kim, C.S. ; Lee, K.Y. ; Moon, J.H. ; Lee, J.C. ; Kim, J.H. ; Lee, B. ; Kim, N.Y.
Author_Institution :
RFIC Center, Kwangwoon Univ., Seoul, South Korea
Abstract :
In this paper, an advanced 2 watt high power amplifier (HPA) for CDMA 900 MHz system is described. The results of this HPA - the linear gain of 30 dB, the gain flatness of 0.27 dB at the desired frequency range (895 MHz - 910 MHz), the input return loss of 18 dB, and the output return loss of 33 dB are obtained. The output power of 39.74 dBm is measured at 0.42 dB gain compression. The back-off technique (BOT) and the pre-distortion technique (PDT) applied to improve the linearity of HPA. The improvement as 7.25 dB of Adjacent Channel Power Ratio (ACPR) is obtained by PDT.
Keywords :
UHF power amplifiers; code division multiple access; radio equipment; 18 dB; 2 W; 30 dB; 33 dB; 895 to 910 MHz; 900 MHz; CDMA system; adjacent channel power ratio; back-off technique; gain compression; gain flatness; high power amplifier; input return loss; linear gain; linearity; output power; output return loss; pre-distortion technique; wireless communication; Distortion measurement; Gain; High power amplifiers; Isolators; Linearity; Multiaccess communication; Nonlinear distortion; Power amplifiers; Power generation; Radiofrequency integrated circuits;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011649
