Improvement of third-order intermodulation product of RF and microwave amplifiers by injection
TLDR
In this paper, the authors discussed the improvement in the third-order intermodulation product (IM3) performance obtainable from RF and microwave amplifiers by two alternative injection techniques.Abstract:
This paper discusses the improvement in the third-order intermodulation product (IM3) performance obtainable from RF and microwave amplifiers by two alternative injection techniques. The first is the addition to the amplifier input of the second harmonics of the input spectrum and the second is the addition to the amplifier input of the difference frequencies between the spectral components of the input signal. Both techniques are considered in theory, by simulation and in practice. Both techniques give useful improvements in two-tone IM3 performance. The second harmonic technique reduced the IM3 level by 43 dB in an amplifier at 835 MHz. The difference-frequency technique gave a reduction of 48 dB in an amplifier at 880 MHz. The difference-frequency technique also gives a greater improvement for complex spectra signals.read more
Citations
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References
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Proceedings ArticleDOI
A low third order intermodulation amplifier with harmonic feedback circuitry
M.R. Moazzam,C.S. Aitchison +1 more
TL;DR: This paper describes a novel technique for reducing the third-order intermodulation product levels in a nonlinear amplifier based on feeding the second harmonic signal produced at the output of the amplifier back to its input.
Journal ArticleDOI
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Youngoo Yang,Bumman Kim +1 more
TL;DR: In this article, a new linearization method by feedforwarding low-frequency second intermodulation component (f/sub 2/- f/sub 1/) improves linearity significantly.
Journal ArticleDOI
New linearization method using interstage second harmonic enhancement
TL;DR: In this paper, a new linearization technique is presented that allows a more efficient operation of these linear amplifiers by combining both the advantage of the transparent nature of feed-forward linearization with the efficiency of feedback linearization.
Proceedings ArticleDOI
Analysis and practical performance of a difference frequency technique for improving the multicarrier IMD performance of RF amplifiers
TL;DR: In this paper, the authors present a difference frequency technique for IMD improvement in power amplifiers based on feeding the original two tone signals and a signal which frequency is the difference frequency of the fundamental signals in to the amplifier.
Proceedings ArticleDOI
IMD elimination and CPR improvement for an 800 MHz HBT MMIC power amplifier
F. Ali,M.R. Moazzam,C. Aitchison +2 more
TL;DR: In this paper, a technique for reducing the third-order intermodulation (IMD) product and ACPR levels in HBT power amplifiers is described, which is based on the dynamic control of the injection/feedback of the second harmonic frequency signal to the amplifier.
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