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

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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.
Original languageEnglish
Title of host publicationProceedings of the 41st European Solid-State Circuits Conference, ESSCIRC 2015
EditorsW Pribyl, F Dielacher, G Hueber
Place of PublicationPiscataway, NJ. USA
PublisherIEEE Society
Number of pages4
ISBN (Electronic)978-1-4673-7472-9
ISBN (Print)978-1-4673-7470-5
Publication statusPublished - 2 Nov 2015
EventESSCIRC 2015: 41th European Solid-State Circuits Conference - Messe Congress, Graz, Austria
Duration: 14 Sep 201518 Sep 2015
Conference number: 41

Publication series



ConferenceESSCIRC 2015
Abbreviated titleESSCIRC


  • Arrays
  • Noise
  • Transducers
  • Ultrasonic imaging
  • Capacitors
  • Gain
  • Imaging


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