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Continuous-Time Analog Two-Dimensional IIR Beam Filters

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4 Author(s)
Leonard T. Bruton ; Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada ; Arjuna Madanayake ; Chamith Wijenayake ; Mona Maini

Analog filter circuits that are realized in continuous-time discrete-space domain are proposed for implementing 2-D infinite impulse response (IIR) spatiotemporal transfer functions having beam-shaped passbands. These filters may be used for analog beamforming applications including seismic, audio, sonar, and ultrasonic signal processing. Unlike digital implementations, the proposed 2-D analog beam filters avoid the need for A/D conversions and digital circuitry. Importantly, the beam distortion (beam squint) due to bilinear transformation that is unavoidable in digital 2-D IIR beam filters is significantly reduced. A demonstrative example using operational amplifiers for first-order analog filters is provided.

Published in:

IEEE Transactions on Circuits and Systems II: Express Briefs  (Volume:59 ,  Issue: 7 )