100MHz square wave generation

[ttse7]

Hi all,

I need to build a circuit which can output a 100MHz square wave. Probably there is no IC to do this. Can anybody here help?

Thanks a lot

 

[pisoiu]

There are crystal oscillators which outputs this freq., you can look for them at uk.farnell.com for example.

/pisoiu

 

[ttse7]

Thanks, but what I need is a square wave, output from crystall oscillator usually is sine wave.

 

[Shohdy]

Hi,

No, there are some crystal osc. chips that produce square waves, you should check it out.

Regards,
Shohdy

 

[pisoiu]

Outputs from crystal quartz may be sine, but usually crystal oscillators outputs square wave, 50% duty cycle. Another reason for which you may see such high freq. as sine wave may be the bandwidth of your oscilloscope.

/pisoiu

 

[shwoo]

Crystal oscillators around 100MHz may come in ACMOS/HCMOS which
will give about 3ns rise/fall time. PECL may give you about 2ns.
You might say these are not "square", but how square do you want?
And why?
Not many people have access to test equipment to check the "squareness"
in this range.
The most important thing may be the pupose of specifying "square wave"
in the first place. Jitter may be also important.

S. H.

 

[ttse7]

sorry to whom have answered my question and I am very grateful to your help.

I forget to mention that the peak voltages of the square wave is +5V and -5V. The usage of this square wave is to drive a Step Recovery Diode.

Thanks for your answer again.