Gichan Yun;Kyeongwon Jeong;Haidam Choi;Seunghyun Nam;Chaerin Oh;Hyunjoo Jenny Lee;Sohmyung Ha;Minkyu Je
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引用次数: 0
摘要
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。
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 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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