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Adaptive nulling loop control for 1.7-GHz feedforward linearization systems

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2 Author(s)
Eid, E.E. ; Ampli Project, Ecole Polytech. de Montreal, Que., Canada ; Ghannouchi, F.M.

An adaptive analog control system is introduced for the nulling loop (first loop) of a 1.7-GHz feedforward linearization system. The sensitivity to temperature and frequency variations is experimentally shown for a conventional feedforward system, leading to the need for an adaptive control system. Two error signals based on detected power levels are introduced and used to control the nulling loop vector modulator to ensure cancellation of the main signal. Finally, the experimental performance of this system is presented

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:45 ,  Issue: 1 )

Date of Publication:

Jan 1997

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