Clipping and clamping with diodes...

Discussion in 'General Electronics Chat' started by Externet, Feb 1, 2016.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    57
    Hi.
    To prevent spikes or signal overdriving, when is one circuit preferred to the other? What rules are to be followed in deciding which to use ? What does one do the other does not ?

    Clipping.png

    Clamping.png
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,772
    931
    One returns overvoltage "spikes" to the signal source and the other returns to the power rails.
    If your signal source is delicate, think CMOS, then the scheme using power rails would be better.
     
  3. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,675
    2,722
    The first case will prevent Vout from exceeding +/- one diode forward voltage drop.

    The second will prevent the inputs of the opamp from exceeding one diode forward voltage drop above and below the power supply rails.
     
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