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Design of Doherty Amplifier With Push-Pull Structure Using BALUN Transform  

정형태 (서강대학교 전자공학과)
김성욱 (서강대학교 전자공학)
장익수 (서강대학교 전자공학과)
Publication Information
Abstract
Push-pull structure with balun transformer is presented for load modulation technique which improves the overall efficiency of power amplifier Under the assumption that output impedance of fumed-off amplifier is high, conventional Doherty amplifier is composed of impedance inverter and peaking amplifier, of which operation is controlled by the input power level. In many case, however, impedance of 'off'amplifier is very low due to matching network or parasitic output capacitance. This paper introduces novel load modulation technique which uses low output impedance of 'off'amplifier. Experimental results show that good linearity and efficient!'enhancement of the proposed push-pull structure
Keywords
Load modulation; Doherty amplifier; push-pull; balun transformer;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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3 C. Potter, S. Cummins, 'Adaptive Digital Predistortion for 3G Systems', 2003 MTT-S workshop
4 S. C. Cripps, 'RF Power Amplifiers for wireless communications,' Artech House Publishers,1999
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