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PGA460: PGA460

Xiao Zhu2
Expert 3215 points
Part Number: PGA460

Hello Team

Could you give some explanation about the wave which mark as green line? Why the wave have a pulse when the wave down in the picture 1? Why the transducer  voltage wave change large

  • 0
    TI__Mastermind 27950 points

    Hi Xiao,

    Your image attachment appears to be broken. Could you re-attach the image?

    Based on your question, I suspect you are asking about the difference between the transducer excitation profile while driving versus immediately switching to listening.

    The momentary shift in frequency and amplitude is likely due to the mechanical resonance of the transducer taking effect. A transducer has both an electrical and mechanical resonance which may not be centered. While driving the transducer at electrical resonance, the mechanical resonance is negated. However, the moment the driver releases the transducer, the mechanical resonance will take effect. This phenomena can be mitigated based on the external passive matching on the secondary side of the transformer. 

    Here is an example where the driver releases and shift occurs approximately at 450us:

  • 0 in reply to Akeem Whitehead
    TI__Expert 3215 points

    Akeem

    See attached picture.