Title :
Feedforward linearizer with reduced output auxiliary amplifier
Author :
Wilson, Trevor ; Paul, D.K.
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
Abstract :
Effective feedforward linearization of a power amplifier can be achieved without compromising performance, using an auxiliary amplifier of lower power than the main amplifier overcoming the inefficiency of the classic feedforward configuration, which employs two amplifiers of the same power rating. Reduction of the power rating of the auxiliary amplifier will lead to improved system efficiency. It is shown that the operating output power level and consequential intermodulation distortion level of the main amplifier are critical in determining the minimum saturation power level of the required auxiliary amplifier. Results of theoretical calculations and CAD simulations for the required minimum saturation power level of the auxiliary amplifier are presented and indicate close agreement
Keywords :
circuit CAD; feedforward; intermodulation distortion; linearisation techniques; nonlinear network synthesis; power amplifiers; CAD simulations; feedforward linearization; intermodulation distortion level; minimum saturation power level; operating output power level; power amplifier; power rating reduction; reduced output auxiliary amplifier; system efficiency; Communication systems; Costs; Delay; Equations; Feedforward systems; Intermodulation distortion; Operational amplifiers; Phase shifters; Power amplifiers; Power generation;
Conference_Titel :
High Frequency Postgraduate Student Colloquium, 2001. 6th IEEE
Conference_Location :
Cardiff
Print_ISBN :
0-7803-7118-6
DOI :
10.1109/HFPSC.2001.962151
