D-flipflop question

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Justin Wenger

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I was trying to build a frequency divider by using a D-flipflop.

The input frequency is 500MHz, and the expected output frequency was 250MHz. But the output node is not oscillating..

What could be the problem of this circuit?

Thank you.
 

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It will neither work as a D-FF at 500 kHz, because it's no valid FF circuit.
--- Updated ---

Your circuit is a D-latch. A D-FF would be comprised of two D-latches with one driven by an inverted clock.
--- Updated ---

Alternative you can make a D-FF of 3 RS-latches

 
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