A Pitch-Matched Analog Front-End with Continuous Time-Gain Compensation for High-Density Ultrasound Transducer Arrays

Conference paper (2021)

Authors

Peng Guo Electronic Instrumentation
ZY Chang Electronic Instrumentation
Emile Noothout ImPhys/Medical Imaging
Rik Vos ImPhys/Medical Imaging, Erasmus MC
Johan G. Bosch Erasmus MC
Nico De de Jong Erasmus MC, ImPhys/Medical Imaging
Martin Verweij Erasmus MC, ImPhys/Medical Imaging
Michiel A. P. Pertijs Electronic Instrumentation
Research Group
Electronic Instrumentation
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Published Date

2021

Language

English

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Research Group

Electronic Instrumentation

Abstract

This paper presents a compact analog front-end (AFE) circuit integrated with a 100µm-pitch 2D ultrasound transducer array for 3D imaging. To realize time-gain compensation, it consists of two variable gain stages, both of which employ a novel complementary current-steering network to realize continuously-variable gain. The first stage is a transimpedance amplifier with a hardware-sharing current-reuse input stage to save power and area. The second stage is a class-AB current amplifier. Per channel, the AFE occupies only 0.025 mm2, consumes 0.8 mW and achieves an input noise density of 1.31 pA/ $\sqrt{\mathbf{H}} \mathbf{z}$. The measured gain error of ±0.4 dB within a 36 dB overall gain range is 2.5 times better than the prior art.

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