www.piclist.com/techref/index.htm?key=frequency+multiplier

jane:

>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

>frequency.

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.)

Simon

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