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Specification of error amplifiers for use in feedforward transmitters

Specification of error amplifiers for use in feedforward transmitters

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IEE Proceedings G (Circuits, Devices and Systems) — Recommend this title to your library

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© The Institution of Electrical Engineers
Published

The performance of a feedforward amplifier, in terms of the linearity improvement which can be achieved, is investigated mathematically. The improvement in linearity is shown to depend on the gain and phase matching throughout the system, and two methods are demonstrated whereby this may be predicted using sensitivity analysis. Finally, the result is used to examine the trade-offs involved in the design of the error amplifier in a feedforward system.

Inspec keywords: sensitivity analysis; transmitters; amplifiers; errors

Other keywords: phase matching; feedforward amplifier; sensitivity analysis; feedforward transmitters; gain; linearity improvement; error amplifiers

Subjects: Amplifiers; General circuit analysis and synthesis methods

References

    1. 1)
      • T.J. Bennett , R.F. Clements . Feedforward — an alternative approach to amplifier linearization. Radio and Elect. Eng. , 5 , 257 - 262
    2. 2)
      • H. Seidel . A microwave feedforward experiment. Bell Syst. Techn. J. , 9 , 2879 - 2916
    3. 3)
      • Johnson, A.K., Myer, R.: `Linear amplifier combiner', 37th IEEE Vehicular Technology Conference, 1–3 June 1987, p. 421–423.
    4. 4)
      • P.D. Lubell , W.B. Denniston , R.F. Hertz . Linearizing amplifiers for multi-signal use. Microwaves , 46 - 50
    5. 5)
      • H. Seidel , H.R. Beurrier , A.N. Friedman . Error-controlled high power linear amplifiers at VHF. Bell Syst. Tech. J. , 651 - 722
    6. 6)
      • Dixon, J.P.: `A solid-state amplifier with feedforward correction for linear single-sideband applications', IEEE International Conference on Communications, June 1986, Toronto, Canada, 1, p. 728–732.
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