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fast clamp circuit

David Zhang16358
Expert 1860 points

Here is the situation I met:

I have generated continuous pulses; the width of those pulses is 4ns. The input signal level is from 0V to 5V. But I have to clamp those input signals down to +3V to -2V output signal level.

Do you think I can use diode clamp circuit to realize above design or I have to use other circuit?

Thanks.

  • 0
    TI__Prodigy 460 points

    David,

    Were you able to find an answer to your question?  I think you may have posted this to the wrong forum, so I am moving it to the High Speed Amps forum.  Someonw should be able to help you there if you still have questions.

    Janie

  • 0
    TI__Expert 4625 points

    David,

    It sounds like what you'd like to do can be done with passive components.  If you take your 0 to 5V pulse train through a DC-blocking cap and then re-bias the center to 0.5V, you'll get a -2V to 3V pulse train.  Note that this assume your system is operating with power supply rails that accomodate voltages below ground. 

    See the attached pdf for a quick example.  Please let me know if I've misinterpreted your question.

     

    Regards,

    Nick - TI High Speed Amps

    Re-bias.pdf
  • 0 in reply to Nick
    TI__Expert 4625 points

    Additional note: this depends on the duty cycle of your pulses.  The above is for a proper square wave.  If your pulses are more spread out, then you'll want to bias down to -2V using the resistor divider.

     

    Regards,

    Nick