Title :
Continuous-Time Analog Two-Dimensional IIR Beam Filters
Author :
Bruton, Leonard T. ; Madanayake, Arjuna ; Wijenayake, Chamith ; Maini, Mona
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Calgary, AB, Canada
fDate :
7/1/2012 12:00:00 AM
Abstract :
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.
Keywords :
IIR filters; analogue circuits; band-pass filters; operational amplifiers; transfer functions; 2D analog beam filter; 2D infinite impulse response; A/D conversion; IIR beam filter; IIR spatiotemporal transfer function; analog beamforming application; analog filter circuit; beam distortion; beam squint; beam-shaped passband; bilinear transformation; continuous-time analog two-dimensional filter; continuous-time discrete-space domain; digital circuitry; first-order analog filter; operational amplifier; Arrays; Complexity theory; Frequency response; Passband; Sensors; Transfer functions; Transforms; 2-D infinite impulse response (IIR) filters; $RC$ active filters; Analog beamforming circuits; multidimensional signal processing; sensors;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2012.2200170
