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A multicarrier amplifier design linearized trough second harmonics and second-order IM feedback

Milovanovic, Bratislav and Males-Ilic, Natasa and Budimir, Djuradj (2001) A multicarrier amplifier design linearized trough second harmonics and second-order IM feedback. In: 5th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS 2001). IEEE, Los Alamitos, USA, pp. 297-300. ISBN 078037228X


Official URL: http://dx.doi.org/10.1109/TELSKS.2001.954895


A novel linearisation technique for reduction in the first and second kind of the third-order intermodulation products was applied in this paper. The second harmonics and second-order intermodulation products are led from the output to the input of a power amplifier through a feedback loop. The power amplifier including the feedback loop components (bandpass filter, phase shifter and attenuator) was designed as a hybrid microwave integrated circuit by using program ADS. The phase and amplitude of the loop signals are the adjustable parameters. Therefore, a voltage that controls a phase shift of the phase shifter and a control current of a PIN diode in the attenuator circuit were optimised to obtain a reduction in the third-order intermodulation distortion. For three fundamental signals at the power amplifier input, the lowest improvement of 13 dB for the first and 18 dB for the second kind of the third order intermodulation product levels was achieved.

Item Type:Book Section
Uncontrolled Keywords:Power amplifier, third-order intermodulation, linearization technique, phase shifter, attenuator, bandpass filter.
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:3273
Deposited On:14 Feb 2007
Last Modified:11 Aug 2010 15:31

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