基于大动态范围放大的无增益调节超声放大电路设计

Design of gainless adjusting ultrasonic amplification circuit based on large dynamic range amplification

针对大型复合构件状态动态变化过程和多谱成像检测的需求,提出了一种无增益调节的宽带大动态范围超声放大电路的设计方法,设计了一种带宽为10 kHz~1.25 MHz,增益大于120 dB的无增益调节的超声信号放大电路。该电路采用多级放大器对信号进行分级放大,分割门限控制和信号状态识别与记录,最后通过数据合成实现了超声发射信号、回波信号全信号大动态、宽频带范围超声的放大。仿真实验表明,该电路可满足大型复合构件状态变化中信号的放大和多谱成像检测需求,其电路设计方法也可应用于其他如冲击波测试、声学测量等领域。

Aiming at the dynamic change process of the state of large composite components and the requirements of multispectral imaging detection,a design method of broadband large dynamic range ultrasonic amplification circuit without gain adjustment was proposed,and an ultrasonic signal amplification circuit without gain adjustment was designed,of which the bandwidth is 10 kHz-1.25 MHz and the gain is greater than 120 dB.A multi-stage amplifier was used to amplify the signal,segment the threshold control and identify&record the signal state.Finally,through the data synthesis,the ultrasonic emission signal and the echo signal were amplified in a large dynamic and broadband range.The simulation results show that the circuit can meet the requirements of the signal amplification and multi-spectral imaging detection during the state variation of large composite components.The circuit design method can also be applied to other fields such as shock wave test and acoustic measurement.