Dynamic range compensation in non-linear sensors
Harold H Szu, Michael J. Wardlaw, Jeff Willey · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2011
A common objective with active magnetic, radio frequency, and acoustic sensors is to detect and sense small signals in the presence of large magnitude clutter or interference signals. When the interference to signal-of-interest ratio is greater than the dynamic range of the linear system, the system response may become non-linear. In this paper an adaptive analog cancellation approach is proposed to track and cancel the interference signal. The circuit's linear property is then recovered, enabling detection of the small magnitude signals. The concept was realized in an active RF sensor which demonstrated the effectiveness of the strategy.