A Pitch-Matched Transceiver ASIC for 3D Ultrasonography with Micro-Beamforming ADCs based on Passive Boxcar Integration and a Multi-Level Datalink
P. Guo (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Z. Y. Chang (TU Delft - Electrical Engineering, Mathematics and Computer Science)
E. Noothout (TU Delft - Applied Sciences)
H. J. Vos (Erasmus MC, TU Delft - Applied Sciences)
J. G. Bosch (Erasmus MC)
N. De Jong (Erasmus MC, TU Delft - Applied Sciences)
M. D. Verweij (Erasmus MC, TU Delft - Applied Sciences, TU Delft - ImPhys/Medical Imaging)
M. A.P. Pertijs (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
This paper presents a pitch-matched transceiver ASIC integrated with a 2-D transducer array for a wearable ultrasound device for transfontanelle ultrasonography. The ASIC combines 8-fold multiplexing, 4-channel micro-beamforming (μ BF) and sub-array-level digitization to achieve a 128-fold channel-count reduction. The μ BF is based on passive boxcar integration and interfaces with a 10-bit 40 MS/s SAR ADC in the charge domain, thus obviating the need for explicit anti-alias filtering and power-hungry ADC drivers. A compact and low-power reference generator employs an area-efficient MOS capacitor as a reservoir to quickly set a reference for the ADC in the charge domain. A low-power multi-level data link concatenates outputs of four ADCs, leading to an aggregate 3.84 Gb/s data rate. Per channel, the RX circuit consumes 2.06 mW and occupies 0.05 mm2.