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ADA4807 Spice Model Slew Rate Modeled Correctly?

Hello,

I am using the ADA4807 model to model the ADA4807-2 in an active filter application where the output is a 10 MHz sinewave. The output has a peak voltage of 1.79 V.

Theoretical calculation shows:

Min Req Slew Rate = 2 * pi * 10 * f * Vpeak/(10^6)  V/us

Which gives minimum 112 V/us slew rate to avoid distortion for this application.

The datasheet states that the ADA4807/ADA4807-2 has a 225 V/us slew rate, but significant slew rate distortion appears in simulation:

Blue is input waveform, red is output.

Is this an error in the spice model?

Thanks!

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  • Hi,

    I did a sanity check on our model and found that it's working. I couldn't replicate what you saw. Did you use the updated model on the product page of ADA4807?

    One thing to note though, at 10 MHz, the gain is not flat since it is beginning to peak at this frequency. Refer to figure 13 of the datasheet.

    Regards.

Reply
  • Hi,

    I did a sanity check on our model and found that it's working. I couldn't replicate what you saw. Did you use the updated model on the product page of ADA4807?

    One thing to note though, at 10 MHz, the gain is not flat since it is beginning to peak at this frequency. Refer to figure 13 of the datasheet.

    Regards.

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