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how to tell if opamp is unity gain stable

Discussion in 'Electronic Design' started by panfilero, Feb 12, 2013.

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  1. panfilero

    panfilero Guest

    hello,

    does anyone know how to tell if an opamp is unity gain stable? My guess isto check out the open loop phase margin and make sure it's over... I dunno.... about 30 degrees... is this it? Don't most opamps have decent open loop phase margin? Should I be saying open loop phase margin or does just saying phase margin imply that you are talking about the open loop phase margin of the opamp?

    much appreciate your comments!
     
  2. Guest

    "open loop phase margin" is an oxymoron, the very term phase margin is partand parcel with feedback, how you could possibly have feedback in a open loop???
     
  3. brent

    brent Guest

    This is a strange post. Your question shows that you know enough
    about this to not need an answer from anyone. Secondly, just how much
    does anyone really worry about unity gain stability in op amps
    anymore? It seems that every op made for the last 20 years is unity
    gain stable.
     
  4. josephkk

    josephkk Guest

    The concept is useful in all cases. That aspect related to the
    definition. It can be measured and used both open and closed loop.

    ?-)
     
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