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For the ring oscillator shown in the figure, the propagation delay of each inverter is $100$ pico sec. What is the fundamental frequency of the oscillator output?

  1. $10 \; \mathrm{MHz}$
  2. $100 \; \mathrm{MHz}$
  3. $1 \; \mathrm{GHz}$
  4. $2 \; \mathrm{GHz}$
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