Empathy List Archives

JF

James Fournier

Thu, Mar 24, 2011 12:57 AM

Hello All,

I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers, inverters, and
differential amplifier circuits. I must be missing something simple because
i just can't shape the wave into a square wave. Has any one done this? Any
hints or tips for a struggling newbie? Many thanks!

--
Best Regards,

James Fournier

Hello All, I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing miserably. I'm still very new at this so please forgive my ignorance. I thought it was going to be easy. I have tried diodes, comparators, op-amps, Schmidt trigger buffers,regular buffers, inverters, and differential amplifier circuits. I must be missing something simple because i just can't shape the wave into a square wave. Has any one done this? Any hints or tips for a struggling newbie? Many thanks! -- Best Regards, James Fournier

BG

Bruce Griffiths

Thu, Mar 24, 2011 1:31 AM

James Fournier wrote:

Hello All,

I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers, inverters, and
differential amplifier circuits. I must be missing something simple because
i just can't shape the wave into a square wave. Has any one done this? Any
hints or tips for a struggling newbie? Many thanks!

Almost all of the above should work provided they are correctly biased.
What exactly is the problem?
No output?
An output duty cycle other than 50%?

Please provide circuit diagrams so that we can spot your errors.

Bruce

James Fournier wrote: > Hello All, > > I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing > miserably. I'm still very new at this so please forgive my ignorance. I > thought it was going to be easy. I have tried diodes, comparators, > op-amps, Schmidt trigger buffers,regular buffers, inverters, and > differential amplifier circuits. I must be missing something simple because > i just can't shape the wave into a square wave. Has any one done this? Any > hints or tips for a struggling newbie? Many thanks! > > Almost all of the above should work provided they are correctly biased. What exactly is the problem? No output? An output duty cycle other than 50%? Please provide circuit diagrams so that we can spot your errors. Bruce

GB

Greg Broburg

Thu, Mar 24, 2011 2:00 AM

Feed it through a 10M0 Hz crystal filter (easy to make
out of one crystal) then put the output of the filter into
a fast comparator. It is commonly done in certain
types of DDS synthesizers. Is that clear enough or do
you need a picture?

Greg

On 3/23/2011 6:57 PM, James Fournier wrote:

Hello All,

I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers, inverters, and
differential amplifier circuits. I must be missing something simple because
i just can't shape the wave into a square wave. Has any one done this? Any
hints or tips for a struggling newbie? Many thanks!

Feed it through a 10M0 Hz crystal filter (easy to make out of one crystal) then put the output of the filter into a fast comparator. It is commonly done in certain types of DDS synthesizers. Is that clear enough or do you need a picture? Greg On 3/23/2011 6:57 PM, James Fournier wrote: > Hello All, > > I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing > miserably. I'm still very new at this so please forgive my ignorance. I > thought it was going to be easy. I have tried diodes, comparators, > op-amps, Schmidt trigger buffers,regular buffers, inverters, and > differential amplifier circuits. I must be missing something simple because > i just can't shape the wave into a square wave. Has any one done this? Any > hints or tips for a struggling newbie? Many thanks! >

time-nuts@lists.febo.com

Squaring Tbolt 10Mhz output