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frequency multiplier?

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circuitmangler

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I could probably find this on google, but it might be of interest to others...

Is there such a thing as a frequency _multiplier_ circuit for digital clock
signals? For instance, using counters, flip-flops, etc. one sees a lot of /n
circuits for various values of n. How about a *2 circuit?

cm
 
circuitmangler said:
I could probably find this on google, but it might be of interest to others...

Is there such a thing as a frequency _multiplier_ circuit for digital clock
signals? For instance, using counters, flip-flops, etc. one sees a lot of /n
circuits for various values of n. How about a *2 circuit?

You can do it with a PLL design, but it will only work over a certain range, the span of the VCO - so you need to design accordingly. The 18F series PIC's have an internal one, so you can use an external 10MHz clock crystal to give a 40MHz clock for the CPU.
 
If You need *2, this circuit can do.
 

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