piclist 2001\01\10\055654a >
Thread: frequency multiplier
face BY : Simon Nield email (remove spam text)

>for the duty cycle, I tried to cascade two frequency
>doubler and connect it to divide-by-two flip-flop. But
>the problem is, the output goes back to the input

you may find that making the two RC networks different will fix this.
try halving the R in one of the networks for example.

(reasoning: if the two networks are _exactly_ the same then you just end up with pulses that are
twice as wide after the second network... of course in real life the two networks will not be quite
identical even with the same nominal value components, this will give a glitch as wide as the
difference between the two networks in the center of the stretched pulse. this glitch may or may not
be too fast for the flip-flop to see it.)


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