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LMV116: Typical characteristics of Gain Phase vs Frequency

NAOKI AOYAMA
Guru 11215 points
Part Number: LMV116

Hello,

Our customer use the LMV116, have a question.

In the typical characteristics of Gain and Phase vs Frequency Fig3.

Is the Gain axis correct?

It shows the frequency of BW is around 4MHz.

Best Regards,

Naoki Aoyama

  • 0
    TI__Mastermind 30600 points
    Hi Naoki-san,

    I agree that the chart looks incorrect but I'll need to verify what is going on here. Please give me a day or two to look into this and get back to you.

    Thank you,
    Paul
  • 0 in reply to Paul Goedeke
    Guru 11215 points
    Hello Paul,

    Thank you for your reply.
    I will wait for your verification.

    Regards,
    Naoki Aoyama
  • 0 in reply to NAOKI AOYAMA
    TI__Mastermind 30600 points
    Hi Naoki-san,

    We tested this device in the lab and found that the gain bandwidth product for this part is about 8MHz, so the plot in the datasheet is roughly correct.

    For high speed amplifiers, the -3dB frequency is a specification when the op-amp is in a certain gain configuration. From the LMV116 datasheet, the conditions for its -3dB frequency are: AV = +1, VOUT = 200 mVPP

    The Aol behavior of these op-amps is used to create a little gain peaking which is used to push the -3dB frequency further out. This can be seen in Figure 9 of the datasheet.

    The key point is that gain bandwidth product and -3dB frequency are different quantities and that for some gain configurations and amplifier types, an op-amp can have much a higher -3dB frequency than the GBW.

    I hope that is clear,
    Paul
  • 0 in reply to Paul Goedeke
    Guru 11215 points
    Hello Paul-san,

    Thank you for your reply.
    I understood the characteristics of ACL and AOL are different.

    Thanks,
    Naoki Aoyama