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Title:: A single-channel multiplier circuit for demodulating echo signal of ultrasound Doppler

Author(s):: LIU Shuaishuai; PENG Hu; Department of Biomedical Engineering, Hefei University of Technology, Hefei 230009, China

Keywords:: Ultrasound; Doppler signal; Demodulation by multiplier; Signal simulation device; Doppler frequency shift; Fourier spectrum

摘要:: 为准确、快速提取超声多普勒频移信号，本研究提出了一种结构简单、成本低廉的单通道乘法器电路。该电路的一路输入为超声回波信号，另一路为与发射信号频率有确定频差的正弦波。通过设计的多普勒信号模拟装置对电路进行测试，并对实验数据进行频谱分析，结果显示，解调得到的多普勒频移信号的频率符合多普勒效应的原理。实验证明，本研究的单通道乘法器电路可以实现对超声多普勒回波信号的解调。

Abstract:: To extract the ultrasound Doppler frequency offset signal accurately and quickly,we proposed a single-channel multiplier circuit with simple structure and low cost. One input of the multiplier was an ultrasonic echo signal, the other input was a sine wave with certain frequency difference to the transmitted signal frequency. The designed Doppler signal simulation device was used to test the circuit,spectrum analysis of experimental data showed that the frequency of the demodulated Doppler shift signal conformed to the principle of Doppler effect. Experiments prove that this single-channel multiplier circuit can demodulate the echo signal of ultrasound Doppler.