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

IF 2.2 Q3 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE IEEE Solid-State Circuits Letters Pub Date : 2024-02-23 DOI:10.1109/LSSC.2024.3369605

Gichan Yun;Kyeongwon Jeong;Haidam Choi;Seunghyun Nam;Chaerin Oh;Hyunjoo Jenny Lee;Sohmyung Ha;Minkyu Je

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Abstract

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.

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用于超声波成像系统的带带宽增强型电流传输器和元件级超声波发射器的超声波接收器

在这封信中，我们介绍了一种超声波（US）成像系统，该系统带有低噪声 US 接收器（RX）和元件级 US 发射器（TX），适用于电容式微机械超声波换能器（CMUT）。拟议的 US RX 通过使用带宽增强电流传送器，将输入寄生电容 $(C_{P})$ 与前端跨阻抗级隔离开来。与传统的电流读出电路相比，通过减少 $C_{P}$ 的影响，噪声和能效都得到了改善。此外，还采用了具有 D 类输出级的 US TX，以 30 V 单极性脉冲激励 CMUT。所提出的 US RX 采用 180 纳米 BCD 工艺制造，在 7.5 MHz 频率和 18 MHz 带宽条件下，输入参考噪声为 2.0 pA/ $\sqrt {textit {Hz}}$，CMUT 电容为 25 pF，功耗为 3.62 mW。

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来源期刊

IEEE Solid-State Circuits Letters Engineering-Electrical and Electronic Engineering

CiteScore

4.30

自引率

3.70%

发文量