A novel resonant noise matching technique is proposed to improve the sensitivity and output SNR of ultrasound receivers. Diverse from the power matching, the resonant noise matching technique proposed in this paper applies resonant LC networks to raise the transducers’ input impedance to a high impedance. As a consequence, in addition to the function of improving the output signal strength, the prominent advantage of the resonant noise matching technique is that the passive gain provided by the matching network can reduce equivalently the receiver’s input-referred noise and thus obtain the minimum noise figure. Furthermore, broadband matching which can cover the transducers’ working bandwidth is also developed to reduce the ringing in received signals, which can significantly improve axial resolution in applications of imaging. For this, an accurate electrical model extended from Butterworth Van-Dyke (BVD) model is obtained to co-simulate with the new matching network in the design. Measurement results show that, the output signal is improved by 5 times through the proposed technique, which is 66.7% larger than that of conventional methods. In addition, the sensitivity of the receiver is significantly improved by more than 10.4 dB which is beneficial for piezoelectric ultrasound transducers in a variety of applications.

中文翻译：

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一种用于压电超声换能器的宽带谐振噪声匹配技术

提出了一种新颖的谐振噪声匹配技术来提高超声接收器的灵敏度和输出信噪比。与功率匹配不同，本文提出的谐振噪声匹配技术应用谐振 LC 网络将换能器的输入阻抗提高到高阻抗。因此，谐振噪声匹配技术除了具有提高输出信号强度的功能外，突出的优点是匹配网络提供的无源增益可以等效地降低接收机的输入参考噪声，从而获得最小的噪声。数字。此外，还开发了可以覆盖换能器工作带宽的宽带匹配，以减少接收信号中的振铃，这可以显着提高成像应用中的轴向分辨率。为了这，获得了从 Butterworth Van-Dyke (BVD) 模型扩展而来的精确电气模型，以与设计中的新匹配网络进行协同仿真。测量结果表明，通过所提出的技术，输出信号提高了5倍，比传统方法提高了66.7%。此外，接收器的灵敏度显着提高了 10.4 dB 以上，这有利于压电超声换能器在各种应用中的应用。