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A new class of spatially-discrete time-continuous 2D IIR filters based on wave-digital-filter theory

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6 Author(s)
Madanayake, A. ; Dept. of Electr. & Comput. Eng., Univ. of Akron, Akron, OH, USA ; Rajapaksha, N. ; Wijenayake, C. ; Kye-Shin Lee
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A new class of continuous-time (CT) two-dimensional (2D) filters based on available 2D IIR wave digital filters (WDFs) is proposed. This class of CT filters is free of the aliasing and switching power dissipation of discrete-time versions and also free of the quantization noise caused by digital underflow. Importantly, the transfer functions do not undergo warping in the temporal-frequency domain due to the bilinear transformation. The method essentially approximates each ideal CT delay element of the 2D IIR WDFs with an analog all-pass block. VLSI circuit implementations of the proposed method are described where inverter-based CMOS circuit that implements the required all-pass transfer function is simulated using 90 nm CMOS BSIM4 models in Cadence.

Published in:

Communications, Computers and Signal Processing (PacRim), 2011 IEEE Pacific Rim Conference on

Date of Conference:

23-26 Aug. 2011