Title :
Second harmonic injecting technique for low intermodulation RF-microwave amplifiers
Author :
Nesimoglu, T. ; Budimir, D. ; Moazzam, M.R. ; Aitchison, C.S.
Author_Institution :
Dept. of Electron. Syst., Westminster Univ., London, UK
Abstract :
An amplifier where the third order IM distortion has been reduced is proposed. If two signals at different carrier frequencies are incident at the input of an amplifier, due to the nonlinearity, these signals will interact with each other and the output will contain additional signals at all combinations of sum and difference of these frequencies, which are IM products. The injection of the second harmonics of the two input in the amplifier together with the fundamental signals will produce additional IM products at the output. By proper selection of phase and amplitude of the injected second harmonics, it is possible to make the third order IM products produced by the second harmonics and the original third order IM products out of phase and equal in amplitude. As a result third order IM products will be eliminated, in principle. Theory and simulation results obtained at 2.5 GHz are presented which supports the suggestion
Keywords :
UHF amplifiers; harmonics; intermodulation distortion; microwave amplifiers; radiofrequency amplifiers; IM distortion; injected second harmonics; low intermodulation RF amplifiers; low intermodulation microwave amplifiers; second harmonic injection technique; third order IM products elimination; third order IMD reduction; Character generation; Circuit simulation; Communication systems; Frequency; Microwave amplifiers; Mobile handsets; Power amplifiers; Power generation; Signal generators; Transmitters;
Conference_Titel :
High Frequency Postgraduate Student Colloquium, 1997
Conference_Location :
Leeds
Print_ISBN :
0-7803-3951-7
DOI :
10.1109/HFPSC.1997.651672
