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

By Bratislav Milovanovic, Natasa Males-Ilic and Djuradj Budimir


A novel linearisation technique for reduction in the\ud first and second kind of the third-order intermodulation\ud products was applied in this paper. The second harmonics and\ud 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

Topics: UOW3
Publisher: IEEE
OAI identifier: oai:westminsterresearch.wmin.ac.uk:3273
Provided by: WestminsterResearch

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