peak voltage detect for ultrasonic waveform

Hello, I'm looking for a method to detect the peak voltage of ultrasonic waveform. The waveform is shown in below. The frequency of the signal is 500KHz.

This waveform is viewed with CH2 configured AC.

The DC bias is 1.5V and it is an output from an amplifier. I wonder if LTC5507 could do this.

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  • 0
    •  Analog Employees 
    on Jul 18, 2018 8:54 AM over 2 years ago

    Hello Jinhy,

    There seems to be a typo in your statement:  0.025W = 25mW, not 250mW.

    An op-amp output resistor is not necessary, but you might get slightly better response with the output resistor. You could try it in LTspice and observe the difference.

    Note that LTspice is simulator, which is not exact in this case. Your actual detector output voltage will vary due to simulator inaccuracies, and due to part-to-part variation. If more accuracy is need, the detector must be calibrated in-circuit.

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  • 0
    •  Analog Employees 
    on Jul 18, 2018 8:54 AM over 2 years ago

    Hello Jinhy,

    There seems to be a typo in your statement:  0.025W = 25mW, not 250mW.

    An op-amp output resistor is not necessary, but you might get slightly better response with the output resistor. You could try it in LTspice and observe the difference.

    Note that LTspice is simulator, which is not exact in this case. Your actual detector output voltage will vary due to simulator inaccuracies, and due to part-to-part variation. If more accuracy is need, the detector must be calibrated in-circuit.

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