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Clipping diodes

Discussion in 'Electronic Basics' started by Jon Slaughter, May 10, 2007.

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  1. Sorry for all the posts but this will be the last one and then if I have any
    more questions I'll wait and group them together.

    I'm curious, again, as to if there is any way to make a diode's knee
    smoother. I know that one can use an opamp to make an active diode but I'm
    sorta interested in the opposite effect.

    Thanks,
    Jon
     
  2. Add a resistor in series with it.
     
  3. Eeyore

    Eeyore Guest

    You beat me to it !

    Graham
     
  4. I might also add that in the "clipper" schematic you linked
    to, the diodes cannot clip to zero incremental gain, because
    they are connected in the feedback path of a non inverting
    opamp configuration. The gain in that configuration is 1 +
    the feedback ratio, so even if the diodes go to zero dynamic
    resistance, the opamp continues to have a gain of 1 for the
    input signal.
     
  5. I think that is the point though? You don't want them to clip all the time.
    As you turn up the gain they will clip more(and more of the highs than
    lows).

    Also, if there they could clip all the time then you would have no signal?


    Thanks,
    Jon
     
  6. I agree that the effect I described is another way to soften
    the clipping effect of the diodes. If the opamp with the
    diode feedback were connected as an inverting stage, the
    clipping would be harsher.
     
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