A compact 0.135-mW/channel LNA array for piezoelectric ultrasound transducers

Conference paper (2015)

Authors

C. Chen Electronic Instrumentation - EEMCS
Zhao Chen Electronic Instrumentation - EEMCS
Zu Yao Chang Electronic Instrumentation - EEMCS
M.A.P. Pertijs Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: Campus only © 2015 C. Chen, Z. Chen, Z.Y. Chang, M.A.P. Pertijs
DOI: https://doi.org/10.1109/ESSCIRC.2015.7313913
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Published Date

02-11-2015

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents a power- and area-efficient 9-channel LNA array for piezoelectric ultrasound transducers to enable real-time 3D imaging with miniature endoscopic and catheter-based probes. In view of the relatively low impedance of piezoelectric transducers, the LNA is implemented as a capacitive feedback voltage amplifier, rather than a trans-impedance amplifier, to achieve a better noise-power trade-off. The use of a current-efficient inverter-based OTA with optimized bias scheme and dual-rail regulation further improves the power efficiency of the LNA while keeping the area compact: 0.01 mm2 per channel. Electrical and acoustic measurement results show that the proposed LNA achieves a 0.6 mPa/√Hz input-referred noise at 4 MHz while consuming only 0.135 mW, which represents a noise efficiency 2.5 × better than the state-of-the-art.

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