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derivation of Rout

Amy Luo
Expert 6895 points

Hi team,

Why If is ignored in step 5 of Rout derivation？

Operational Amplifier Stability - Part 3 of 15 RO and ROUT.pdf

  • 0
    TI__Guru**** 164396 points

    Hello Amy,

    The feedback current does flow through Ro, however this is usually insignificant.  The feedback load is generally a very light load compared to Ro. Because IOUT doesn't change VOUT much, the current change in feedback path changes very little. It is not worth complicating the formula.