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How to get the Open-Loop Gain and Phase vs Frequency figure?

Owen Yan
Intellectual 2650 points
Other Parts Discussed in Thread: TINA-TI

Hi team,

I want to how to test this picture in datasheet?

For example, @1Hz, why the gain is 120dB? It's calculated or by test?

Thanks for your answer!

B R,

Owen Yan

  • +1
    TI__Genius 14726 points

    Hi Owen,

    There are multiple methods to verify AOL gain and phase compared to the datasheet specifications. It is possible to use SPICE to simulate AOL. Application Note 1516 section 2.1 has detailed information on how to use TINA-TI to create AOL gain/phase waveforms (AN 1516 attached here: AN1516).

    If it is desired to measure the performance of a particular DUT, it is possible to test  AOL using a bode analyzer. Using a bode 100, it is possible to close the loop of the amplifier and obtain accurate values for AOL knowing the gain of the circuit (document here explains test conditions in further detail: Bode100AOL).

    To answer your second question, AOL gain/phase waveforms demonstrate typical device performance, and data is obtained via testing.

    Additional resources can be found here in our TIPL lectures covering bandwidth for amplifiers: TIPL Link.

    Let me know if this helps you with understanding how to calculate/measure AOL.

    Regards,

    Jacob

  • 0 in reply to Jacob Nogaj
    TI__Intellectual 2650 points

    Hi Jacob,

    Thanks for your help! 

    B R,

    Owen Yan