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Square wave forming from sinus ?

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Astrid

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I have 10MHz sin from OCXO and I need precise square wave with possibility set ratio between Hi and Lo (40:60 up to 50:50)
that all with highly slope edge.

Advise me?
 

What is this for? You should be able to use a simple (fast) comparator, which compares the 10MHz sine with an adjustable DC voltage. Of course, the magnitude of the 10MHz OCXO voltage, the amount of noise, the required precision of the output, and other factors will determine what type of comparator you choose.
 

What is this for?
For extracting harmonics waves from fundament wave.
For example I need 10th harmonics result from Fortier analysis, ideal use square wave with 45ns High.
 

Dear Astrid
Why you don't create a square wave in this frequency , directly ?
Respect
Goldsmith
 

I have 10MHz sin from rubidium normal and need 200MHz and 500MHz low jitter sinus
My idea is from 10MHz sin make square n45 -> extract 10th harmonics 100MHz from 100MHz over multiplier 2x **broken link removed** make 200MHz
from 100MHz make square n50 and from 5th farmonics make 500MHz sin. Alternatively 500MHz we can make over multiplier 5x from 100MHz.
How else?
 

Unfortunately, PLL or digital multipliers not emitted sine with low jitter. For my purpose are useless
 

Hi Astrid
What kind of PLL you are referring to ? for PLL if your frequency has high precision it's out put will have high precision too .
 

You do not have, PLL is burdened with a number of errors that can not be eliminated.
The method described allows me to generate sine 200MHz with phase jitter below 1 ps and PLL 100-1000ps
 

A way to achieve low jitter square way : use a 100MHZ crystal oscillator ( it is available in a package and it's out put is just 5 volts ) . then multiply it . or if you don't want multiply it . create a high frequency square wave with a fast not or nand gate and then , divide it's frequency to achieve your desired range . the benefit of this action is , that your jitter will divide too .
Good Luck
Goldsmith
 

Unfortunately, frequency standards is 10MHz , rubidium frequency normal too.
 

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