[time-nuts] 5 MHZ PIC PPS Divider?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Apr 11 17:56:16 EDT 2008

John Ackermann N8UR wrote:
> Has anyone come up with a 5 MHz input version of TVB's PIC divider?  I
> could use one...
> Thanks,
> John

You could always cheat using a simple frequency doubler.
Use a pair of diodes to create a fullwave rectified sinewave followed by 
a comparator for a sinewave input.
A simple feedback loop can be used to ensure the comparator output duty 
cycle is 50%.

Use a circuit that generates a pulse on every transition for a square 
wave input.
Low pass filtering the square wave can be used to produce a waveform 
that the comparator above could work with.
A feedback loop could be used to maintain the comparator output duty 
cycle at 50%.


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