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  1. #1
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    Ltspice model for ultrasonic transducer

    I'am need to create an electrical model for my transducer here are the specs:

    Capacitance: 6800pf+/-10%
    Impedance: 35 ohms
    Operating frequency: 28khz/40khz/122khz

    What I wanted to do in my simulation is to plot the impedance spectrum of the model that shows that at the given operating resonant frequency the impedance is minimum. I've found an example on the web a simple model for a 28khz transducer. I just want to know how to modify it to match the specs of my transducer.

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  2. #2
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    Re: Ltspice model for ultrasonic transducer

    I presume you are referring to a simple LC parallel/series resonator like below


    Click image for larger version. 

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    You should be able to add multiple series LC circuits for different resonant frequencies. To fit the impedance curve, multiple real load resistors or transformers may be necessary.

    To match the resonator Q, you'll also look for parallel resonance frequency and the difference between both resonances. The given data is incomplete.



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