Browse > Article
http://dx.doi.org/10.5394/KINPR.2003.27.2.209

A Study on Implementation and Performance Evaluation of Error Amplifier for the Feedforward Linear Power Amplifier  

Jeon, Joong-Sung (Research Institute of Industry Technology, Korea Maritime University)
Cho, Hee-Jea (Dept. of Radio Information and Communication Engineering, Korea Maritime University)
Kim, Seon-Keun (KTF 3G Radio N/W Engineering Team Network Group)
Kim, Ki-Moon (Dept. of Radio Information and Communication Engineering, Korea Maritime University)
Publication Information
Journal of Navigation and Port Research / v.27, no.2, 2003 , pp. 209-215 More about this Journal
Abstract
In this paper. We tested and fabricated the error amplifier for the 15 Watt linear power amplifier for the IMT-2000 baseband station. The error amplifier was comprised of subtractor for detecting intermodulation distortion, variable attenuator for control amplitude, variable phase shifter for control phase, low power amplifier and high power amplifier. This component was designed on the RO4350 substrate and integrated the aluminum case with active biasing circuit. For suppression of spurious, the through capacitance was used. The characteristics of error amplifier measured up to 45 dB gain, $\pm$0.66 dB gain flatness and -15 dB input return loss. Results of application to the 15 Watt feedforward Linear Power Amplifier, the error amplifier improved with 27 dB cancellation from 34 dBc to 61 dBc IM$_3$.
Keywords
Feedforward; Error Amplifier; Feedforward; LPA; RF Power Amplifier; IM$_3$; LPA; IMD;
Citations & Related Records
연도 인용수 순위
  • Reference
1 박웅희, 이경희, 강상기 (2002), '아날로그 Feedforward 선형회기를 이용한 IMT-2000대역 선형증폭기 설계' 전자공학회논문집, 제39권 TC편, 제6호, pp. 285-291
2 David. M. Pozar(1991), Microwave Engineering, Addison-Wesley Publishing Company, pp. 395-400
3 D. Myer(1998), 'Ultra Linear/Feedforward Amplifier Design,' IEEE MTT-S Digest, pp. 1125-1127
4 K. Chang(1983), C. Sun, 'Millimeter-Wave PowerCombining Techniques' IEEE Trans., Vol. MTT-31, pp. 91-107
5 N. Pothecary(1999), 'Feedforward Linear Power Amplifier', Artech House
6 R. H. Hardin(l960), E. J. Downey, and J. Munushian, 'Electronically variable phase shifters utillizing variable capacitance diodes,' Proc IRE(letter), Vol. 48, pp. 944-945
7 S. C. Cripps(l999), 'RF Power Amplifier for Wireless Communications,' Artech House
8 S. Hopfer(1979), 'Analog Phase Shifter for 8-18 GHz,' Microwave journal, Vol. 22, pp. 48-50
9 T. Edwards(1992), 'Foundations for Microstrip Circuit Design,' John Wiley & Sons, pp. 267-276