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A Real-Time Current-Mode CMOS Analog Median Filtering Cell for System-on-Chip Applications

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3 Author(s)
Hung, Y.-C. ; Nat. Chin-Yi Univ. of Technol., Taipin ; Shieh, S.-H. ; Tung, C.-K.

Signal processing circuits are very useful elements in fuzzy logic, artificial neural network, and image application. In image processing, median filter is adopted to remove pulse noise. In the paper, a real-time CMOS analog median circuit is proposed. Based on current-mirror, current comparison, and some digital logics, a new analog median filter with high-speed low chip area is achieved. By using TSMC 0.35 mum CMOS technology, the median filter provides a 0.4-muA discriminability and well tracked the median value among input currents. In addition, the median filter cell can be expanded to have signal level 'sort' capability.

Published in:

Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on

Date of Conference:

20-22 Dec. 2007

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