A High-Frequency Beamforming Channel for Ultrasound Stimulation and Ultrasonic Powering
Rivandi, H. (TU Delft Bio-Electronics)
Ghosh, Ishaan (Student TU Delft)
Lopes Marta da Costa, T.M. (TU Delft Bio-Electronics)
New non-imaging ultrasound applications, such as ultrasound stimulation and ultrasonic power transfer, need sub-millimeter volumetric spatial resolution, electronically control of the focal spot location, high ultrasound intensity, and a tiny form factor. Satisfying these requirements demands a high-frequency phased array ultrasound transducer. On the other hand, the pitch size in a phased array must be half of the sound wavelength to avoid grating lobes in the ultrasound beam profile. In other words, higher frequency results in a smaller available area to implement a high-voltage electronics beamforming channel. While prior efforts have reached a maximum frequency of 8.3 MHz, this work utilizes a low area high-voltage level shifter coupled with optimum phase wrapping to present two 15 MHz and 12 MHz pixel-level pitch-matched beamforming channels that deliver 20 V and 36 V to the ultrasound transducer load, respectively. Furthermore, the phase of the output is programmable with 3-bits resolution that allows fine control of focal spot location. The proposed beamforming channels have been implemented in 0.18-µm BCD technology and consume 960 µA and 1.23 mA from 20 V and 36 V power supplies, respectively.
ultrasound phased array
To reference this document use:
phased array beamformer
high-voltage beam-forming channel
Proceedings of the 2022 IEEE Biomedical Circuits and Systems Conference (BioCAS)
2022 IEEE Biomedical Circuits and Systems Conference (BioCAS), 2022-10-13 → 2022-10-15, Taipei, Taiwan
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
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© 2022 H. Rivandi, Ishaan Ghosh, T.M. Lopes Marta da Costa