Slew rate

Discussion in 'General Electronics Chat' started by Prashanthpaib, Aug 22, 2010.

  1. Prashanthpaib

    Thread Starter New Member

    Aug 22, 2010
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    Brief:
    I want to implement the ESD & Transients protection to my circuit using current limiting resistor is typically 100 ohms to 1K ohms which forms a pole with the diode capacitance.I meant to say a transient clipping circuit using a series resistor and rail-to-rail diodes

    Question:
    Please let me know how to calculate the slew rate for this circuit ?


     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. SgtWookie

    Expert

    Jul 17, 2007
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    You can keep your slew rate pretty high by using small diodes. 1N4148/1N914 are limited to around 100mA, but are extremely fast (~4nS switch time max), and have a low capacitance (<4pF @1MHz.) Compute your RC time for resistance vs 2 junctions.

    1N4148/1N914 diodes do have a somewhat high Vf at low currents. You might look at Schottky diodes, like BAT54's or the like. They're fast and have a very low Vf.
     
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