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LT1028 Phase Margin

Category: Datasheet/Specs
Product Number: LT1028
Software Version: LTSpice XVII 17.0.35.0

I'm simulating the open loop gain/phase for an LT1028 and my result differs from the datasheet at Av=1.  I get a phase margin of almost 45 degrees and as it is not unity gain stable  it should be closer to 0 degrees per the figure on page 8 of the datasheet.  I have used 2 different methods of obtaining the OL gain and the results are the same.

Can you shed any light on why I have a larger phase margin in the simulation than I should expect given datasheet specs?

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  • Hi Tim,

    Thank you for your feedback.
    It may be a case of modelling trade-off.
    The phase plot is not the usual shape for op-amps, and it seems that the modeler gave priority to getting the shape of the phase closer to the datasheet.

    We will forward your feedback to the developers.

    Thank you,
    Sham

Reply
  • Hi Tim,

    Thank you for your feedback.
    It may be a case of modelling trade-off.
    The phase plot is not the usual shape for op-amps, and it seems that the modeler gave priority to getting the shape of the phase closer to the datasheet.

    We will forward your feedback to the developers.

    Thank you,
    Sham

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