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Advanced Design Methods of Doherty Amplifier for Wide Bandwidth, High Efficiency Base Station Power Amplifiers

Overview This paper has proposed advanced design methods of Doherty amplifier for high efficiency base station power amplifiers with wide bandwidth. First, the paper develops Doherty amplifier with uneven power drive which is provided more input power to the peaking cell than the carrier cell for full power operation and appropriate load modulation. Second, the paper optimizes the matching circuits of the carrier and peaking cells individually to enhance the linearity and efficiency. Third, it optimizes the bias circuit to solve an asymmetric ACLR (Adjacent Channel Leakage Ratio) characteristics for wideband signals such as WCDMA 4FA. The proposed design methods are applied to implement Doherty amplifier using a MRF5P21180.

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Publisher
Pohang University of Science And Technology
File Format
PDF
Date Published
Jul 11, 2008
Format
White Papers
Topics
TDMA - CDMA, Mobile - Wireless Communications, Bandwidth Issues

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