An Ultrasound Receiver With Bandwidth-Enhanced Current Conveyor and Element-Level Ultrasound Transmitter for Ultrasound Imaging Systems

In this letter, we present an ultrasound (US) imaging system with a low-noise US receiver (RX) and an element-level US transmitter (TX) for a capacitive micromachined ultrasonic transducer (CMUT). The proposed US RX isolates the input parasitic capacitance (C_{P}) from the front-end transimpedance...

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Bibliographic Details
Published in:IEEE solid-state circuits letters 2024, Vol.7, p.98-101
Main Authors: Yun, Gichan, Jeong, Kyeongwon, Choi, Haidam, Nam, Seunghyun, Oh, Chaerin, Lee, Hyunjoo Jenny, Ha, Sohmyung, Je, Minkyu
Format: Article
Language:English
Subjects:
Capacitance
Capacitive micromachined ultrasonic transducer (CMUT)
Capacitors
current conveyor
Current conveyors
Gain
Imaging
Micromachining
parasitic capacitance
Parasitics (electronics)
Power efficiency
Radio frequency
Receivers
Transducers
transimpedance
Transistors
ultrasound (US)
US receiver (RX)
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Summary:In this letter, we present an ultrasound (US) imaging system with a low-noise US receiver (RX) and an element-level US transmitter (TX) for a capacitive micromachined ultrasonic transducer (CMUT). The proposed US RX isolates the input parasitic capacitance (C_{P}) from the front-end transimpedance stage by using a bandwidth-enhanced current conveyor. By reducing the effects of the C_{P} , the noise and power efficiency are improved compared to the conventional current readout circuits. Also, a US TX having a class-D output stage is implemented to excite the CMUT with 30-V unipolar pulses. Fabricated in a 180-nm BCD process, the proposed US RX achieves input-referred noise of 2.0 pA/ \sqrt {\textit {Hz}} at 7.5 MHz and a bandwidth of 18 MHz with 25-pF CMUT capacitance while consuming 3.62 mW.
ISSN:2573-9603
2573-9603
DOI:10.1109/LSSC.2024.3369605