[time-nuts] up converting 10MHz to 20MHz

Bob Camp kb8tq at n1k.org
Wed Dec 10 07:40:16 EST 2014


The noise level of most micro’s is pretty poor. I’d just go with any of the many IC multipliers. They all will get the job done without much effort. You can do an adequate job in this caee with an X-OR gate with an R/C to one input. (clock goes direct to one input, delayed version (via series R and shunt C) goes to the other input)).


> On Dec 9, 2014, at 7:47 PM, lincoln <lincoln at ampmonkeys.com> wrote:
> Hello,
> 	I'm having a dumb idea, I have an MCU that uses a 20 MHz VC-TCXO. The micro, among other things, runs a loop and correct the oscillator by using a 1pps from a gps. I have a 10 MHz mv200 that I would like to try to use. I've got the control voltage handled but i will need to multiply its output up to 20 MHz. What would be the most kosher way do do this? I was having a look at Cypress's CY22381 because I have the programmer but the chips are not widely distributed. But nether are mv200's Silicon labs also make all kinds of clock chips as well.
> What do you guys think? What would be the best way to scale up by X 2? lowish phase noise / jitter is important, low power is not. 
> Thank you,
> Lincoln
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