Joseph Bastin, Joseph Jose, Vanjari Siva Rama Krishna
Annu Int Conf IEEE Eng Med Biol Soc. 2015 Aug;2015:4371-4. doi: 10.1109/EMBC.2015.7319363.
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 μm(2) area for a 64 element digital beamforming circuit) compared to the conventional square root based algorithm.
开发了一种针对低频（2MHz）一维线性电容式微机械超声换能器（CMUT）阵列的低功耗、面积高效数字波束形成器。在设计波束形成逻辑时，充分利用了CMUT阵列的对称性，以减少面积和功耗。通过为任意波形发生器（AWG）提供时钟，在Matlab中验证了所提出的方法。该架构已成功在Xilinx Spartan 3E FPGA套件中实现，以检查其功能。针对UMC 90nm技术，在Vdd 1.62V的应用专用集成电路（ASIC）平台上，为8、16、32和64阵元的CMUT实现了波束形成逻辑。据观察，与传统的基于平方根的算法相比，所提出的架构功耗和面积显著更低（对于一个64阵元的数字波束形成电路，功耗为1.2895mW，面积为47134.4μm²）。
