A digital beamformer for high-frequency annular arrays

  title={A digital beamformer for high-frequency annular arrays},
  author={J. Brown and G. R. Lockwood},
  journal={IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control},
Digital transmit and receive beamformers for a 45-MHz, 7-element annular array are described. The transmit beamformer produces 0- to 80-Vpp monocycle pulses with a timing error of less than /spl plusmn/125 ps. Up to four adjustable transmit focal zones can be selected. The dynamic receive beamformer uses a variable frequency sampling technique in which the frequency of analog-to-digital conversion on each channel is adjusted as the signals are received. The variable frequency clock signals… CONTINUE READING
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