The device parameter as well as resonance frequency, mechanical quality factor and work band width were determined by the equivalent circuit input impedance admittance circle diagram.
分析压电式超声波换能器的等效电路，并由等效电路输入阻抗的导纳圆图确定了换能器的元器件参数以及谐振频率、机械品质因数和工作带宽等特征参量。
The system uses a powerful transmitting circuit that transmits width-variable pulses, and a sensitive receiving circuit that offers quite wide frequency band.
该系统采用大功率、可变发射脉宽的发送电路，高灵敏度、宽带的接收电路，能实现快速、动态、高分辨率的采集和成像。
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