Calculate ring oscillator (5 stages NOT gate) frequency

Discussion in 'General Electronics Chat' started by Faiz Valensi, Jun 8, 2016.

  1. Faiz Valensi

    Thread Starter New Member

    Jun 16, 2014
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    How to calculate the oscillation frequency of the ring oscillator? The capacitor for each of the NOT gate is 9.3pF.
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    Usually it's done via simulation. But to get a rough estimate you need to determine the channel resistance of your FETs (which is also generally done via simulation, but you can also use the equations governing the FET in saturation to estimate it).
     
  3. Faiz Valensi

    Thread Starter New Member

    Jun 16, 2014
    7
    0

    Yeahh, the value of the oscillation frequency in simulation is 8.3MHz, and i just need to calculate to proove it :/
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,743
    4,795
    Well, what's the channel resistance of your FETs when in saturation?
     
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