Possible to amplify a TTL Signal coming out of a pulse generator? Out of the generator is 2.5V and I need 5V. The generator cannot go higher than 2.5V.

I can only tolerate a 4ns rise time. Non-inverting amplification feasible? Any suggestions on fast enough op amps or discrete configuration?

Thanks.

 

Can you use a surface mount IC?

 

Can you use a surface mount IC?

Yes that is an option.

Thanks for the reply.

 

Use High Speed Schmitt inverters at the output

 

You could also use a CMOS 555, or some other CMOS gate.

 

4nS rise time is very small. You'd require >= 500MHz bandwidth in an amplifier.
1/4nS = 250MHz for an Av of 1; and you want an Av of 2.
[eta]
Oops, you'd need >= 1GHz GBW. 250MHz GBW would be -3dB; half-power point.

There are no 555 timers that I know of that have such a high bandwidth.

A high-speed video amplifier might work. However, the board design is going to be quite critical, along with the components used. You're basically dealing with RF signals here, and parasitics will rear their ugly heads.

Input and output impedances will have to match.

 

Use High Speed Schmitt inverters at the output

That's a good idea. It would be helpful if you could recommend an actual part number. I can't find rise and fall time specs for any TTL family.

 

One device that might work is an LT1016 comparator. Even if it is not the ideal solution, the data sheet has good information as to circuit layout necessary to realize such performance - http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1004,C1012,P1225

 

I'd briefly considered the LT1016, but it's too slow (10nS vs 4nS) and the output voltage swing is not sufficient (~0.3v to ~3.4v with a 1mA load)

 

LMV7219 is a comparator with rail-to-rail output and typical output transition times of 1.3nS.
If you use it, set your input threshold voltage at approximately 1.25V.