A low power, area efficient fpga based beamforming technique for 1-D CMUT arrays

Joseph, B and Joseph, J and Vanjari, Siva Rama Krishna (2015) A low power, area efficient fpga based beamforming technique for 1-D CMUT arrays. In: 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 25-29 Aug, 2015, Milan.

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Abstract

A low power area efficient digital beamformer targeting low frequency (2MHz) 1-D linear Capacitive Micromachined Ultrasonic Transducer (CMUT) array is developed. While designing the beamforming logic, the symmetry of the CMUT array is well exploited to reduce the area and power consumption. The proposed method is verified in Matlab by clocking an Arbitrary Waveform Generator(AWG). The architecture is successfully implemented in Xilinx Spartan 3E FPGA kit to check its functionality. The beamforming logic is implemented for 8, 16, 32, and 64 element CMUTs targeting Application Specific Integrated Circuit (ASIC) platform at Vdd 1.62V for UMC 90nm technology. It is observed that the proposed architecture consumes significantly lesser power and area (1.2895 mW power and 47134.4 μm2 area for a 64 element digital beamforming circuit) compared to the conventional square root based algorithm.

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