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Performance Enhancement of Doherty Power Amplifier with LINC
Suk-Hui Lee,Sang-Ki Kim,Sung-Il Bang 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we analysis doherty amplifier’s electric nonlinearity and electrothermal memory effect and propose a proper compensator structure, LINC(LInear amplification using Nonlinear Components), with WCDMA signal input. A power amplifier is important component that decide efficiency in communication system. A doherty power amplifier is good efficiency. However, it has high distortion characteristic. For high efficiency and linearity, we propose a proper doherty amplifier sheme with temperature compensation. The ACLR characteristics of compensated doherty amplifier is improved 12.55 ㏈ at 5 ㎒ offset frequency.
Thermal memory effect modeling and compensation for Doherty amplifier with limiter and pre-distorter
Suk-Hui Lee,Sung-Il Bang 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper reports on an attempt to investigate, model and quantity the contribution of the electrical nonlinearity effects and the thermal memory effects to a Doherty amplifier's distortion generation and suggests thermal memory effect compensator for pre-distorter. Also this paper reports on the development of advanced Doherty amplifier structure with limiter and linear amplifier. A compensated LLHD amplifier enhances ACLR performance about 22 ㏈.