High Dynamic Range Nonlinear Measurement using Analog Cancellation

Report No. ARL-TR-6234
Authors: Joshua M. Wetherington and Gregory J. Mazzaro
Date/Pages: October 2012; 26 pages
Abstract: An active analog canceller system is implemented to maximize the dynamic range of a two-tone nonlinear measurement, a common test for nonlinear radio frequency behavior. The canceller uses active feedforward cancellation, controlled by a fully automated iterative algorithm. The system enables testing of a variety of nonlinear channels and devices, either by direct connection or wireless probing. In this report, the advantages of feedforward cancellation are summarized, a two-tone architecture using this cancellation is presented, the software algorithm for automating measurements using this architecture is explained, and the performance of the cancellation system recently constructed at the U.S. Army Research Laboratory (ARL) is evaluated using measured data.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2012