Improvement of third-order intermodulation product of RF and microwave amplifiers by injection

Aitchison, Colin S. and Mbabele, Modeste and Moazzam, M. Reza and Budimir, Djuradj and Ali, Fazal (2001) Improvement of third-order intermodulation product of RF and microwave amplifiers by injection. IEEE Transactions on Microwave Theory and Techniques, 49 (6, par). pp. 1148-1154. ISSN 0018-9480

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Official URL: http://dx.doi.org/10.1109/22.925508

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

Item Type: Article
Uncontrolled Keywords: MESFET circuits, UHF circuits, UHF power amplifiers, harmonics, intermodulation distortion, microwave circuits, microwave power amplifiers, 835 MHz, 880 MHz, RF amplifiers, complex spectra signals, difference frequencies, injection techniques, input spectrum microwave amplifiers, second harmonics, spectral components, third-order intermodulation product, two-tone IM3 performance
Subjects: University of Westminster > Science and Technology > Electronics and Computer Science, School of (No longer in use)
Depositing User: Miss Nina Watts
Date Deposited: 13 Feb 2007
Last Modified: 11 Aug 2010 14:31
URI: http://westminsterresearch.wmin.ac.uk/id/eprint/3237

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