High frequency clipping circuit

Discussion in 'Analog & Mixed-Signal Design' started by blue.squirrel, Jan 31, 2017.

  1. blue.squirrel

    Thread Starter New Member

    Jan 31, 2017
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    I have an OCXO oscillator (5Vpp, 38.4MHz sine wave, 5ppb) that needs to be fed into an IC that has max input level of 800mVpp. I am trying to use a set of schottky diodes (1N6263w) to clipped sine wave. It seems that I have inevitably introduced instability to the OCXO output. Is clipping diodes the right strategy to do this or is there other circuits that I can use?
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Have you tried voltage divider?
     
  3. blue.squirrel

    Thread Starter New Member

    Jan 31, 2017
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    Thanks for the reply! My concern with voltage divider is that it changes the slew rate of the OCXO signal. Hence, going down the path of the clipping diodes to try to preserve the slew rate.
     
  4. crutschow

    Expert

    Mar 14, 2008
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    Do you have a resistor between the oscillator output and the diodes?
    If not, you need one.
     
    Last edited: Jan 31, 2017
  5. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
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    What is there about the rest of the circuit that makes that a problem? In fact, what is there about the rest of the circuit? I assume it has electronic components. Do you have the part numbers?

    ak
     
  6. ian field

    AAC Fanatic!

    Oct 27, 2012
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    Shottky barriers diodes tend to have higher junction capacitance than regular silicon, and some outputs don't like capacitive loads.

    I would suggest a resistor between the output and diodes - but I'm thinking there should already be one.
     
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