A Single-Chip 64-Channel Ultrasound RX-Beamformer Including Analog Front-End and an LUT for Non-Uniform ADC-Sample-Clock Generation
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- Title
- A Single-Chip 64-Channel Ultrasound RX-Beamformer Including Analog Front-End and an LUT for Non-Uniform ADC-Sample-Clock Generation
- Authors
- YOON, JEE KIM; Cho, S.-E; Um, J.-Y; Chae, M.-K; Bang, J; Song, J; Jeon, T; KIM, BYUNGSUB; Sim, J.-Y; PARK, HONG JUNE
- Date Issued
- 2017-02
- Publisher
- IEEE
- Abstract
- A 64-channel RX digital beamformer was implemented in a single chip for 3-D ultrasound medical imaging using 2-D phased-array transducers. The RX beamformer chip includes 64 analog front-end branches including 64 non-uniform sampling ADCs, a FIFO/Adder, and an on-chip look-up table (LUT). The LUT stores the information on the rising edge timing of the non-uniform ADC sampling clocks. To include the LUT inside the beamformer chip, the LUT size was reduced by around 240 times by approximating an ADC-sample-time profile w.r.t. focal points (FP) along a scanline (SL) for a channel into a piece-wise linear form. The maximum error between the approximated and accurate sample times of ADC is eight times the sample time resolution (Ts) that is 1/32 of the ultrasound signal period in this work. The non-uniform sampling reduces the FIFO size required for digital beamforming by around 20 times. By applying a 9-dot image from Field-II program and 2-D ultrasound phantom images to the fabricated RX beamformer chip, the original images were successfully reconstructed from the measured output. The chip in a 0.13-um CMOS occupies 30.25 mm(2) and consumes 605 mW.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37128
- DOI
- 10.1109/TBCAS.2016.2571739
- ISSN
- 1932-4545
- Article Type
- Article
- Citation
- IEEE Transactions on Biomedical Circuits and Systems, vol. 11, no. 1, page. 87 - 97, 2017-02
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