Title :
Linearization of broadband doherty amplifier
Author :
Doric, Aleksandra ; Males-Ilic, Natasa ; Atanaskovic, Aleksandar ; Milovanovic, Bratislav
Author_Institution :
Innovation centre of Adv. Technol. Nis, Niš, Serbia
Abstract :
The linearization of broadband two-way Doherty amplifier for application in the frequency range 0.85-1.15GHz is considered in this paper. The carrier and peaking amplifiers in Doherty configuration comprise Freescale´s transistor MRF281S LDMOSFET characterized by the maximum output power 4W and the broadband lumped element matching circuits. The linearization of the amplifier is carried out by the second harmonics and fourth-order nonlinear signals that are extracted at the output of the peaking cell, adjusted in amplitude and phase and injected at the input and output of the carrier cell in Doherty amplifier. The effects of linearization are considered for two tones separated in frequency by 10MHz, 20MHz, 40MHz and 80MHz at different input power levels of 0dBm, 5dBm, 10dBm and 15dBm, as well as for WCDMA digitally modulated signal.
Keywords :
code division multiple access; linearisation techniques; wideband amplifiers; Freescale transistor MRF281S LDMOSFET; WCDMA; broadband lumped element matching circuits; broadband two-way Doherty amplifier linearization; fourth-order nonlinear signals; frequency 0.85 GHz to 1.15 GHz; frequency 10 GHz; frequency 20 MHz; frequency 40 MHz; frequency 80 MHz; power 4 W; second harmonics signals; Band-pass filters; Broadband amplifiers; Harmonic analysis; Power amplifiers; Power harmonic filters; Transistors; Doherty amplifier; broadband; intermodulation products; linearization; second harmonics and fourth-order nonlinear signals;
Conference_Titel :
Telecommunication in Modern Satellite, Cable and Broadcasting Services (TELSIKS), 2013 11th International Conference on
Conference_Location :
Nis
Print_ISBN :
978-1-4799-0899-8
DOI :
10.1109/TELSKS.2013.6704429
