how to generate 2 ns width pulses?

[steve_rb]

For diagnosing a module I need to generate 2 ns width pulses with preferably 10 ms spacing between pulses and about 25 mV amplitude. Pulses needs only to have positive lope. It does not need to be square shape. These pulses are supposed to be output simulation of a detector. I am not in GB oscillators that much. What is the best way of doing this?

 

[biff44]

Dual gate driver output to two short transmission lines. One line is 2 nS longer than the other. Then send the two transmission lines to a XOR gate. Use gigabit logic gates. trim line length to get it exactly 2 ns wide output pulses.

 

[steve_rb]

Dual gate driver output to two short transmission lines. One line is 2 nS longer than the other. Then send the two transmission lines to a XOR gate. Use gigabit logic gates. trim line length to get it exactly 2 ns wide output pulses.

biff could you please send a hand draw of the schematic with part numbers. I am not really a circuit designer.

 

[tony_lth]

If you have a signal geberator, such as AGILENT E8672, you can set that in the signal generator.

 

[steve_rb]

I don't have Agilent. I have another one which cover MHZ range.

 

[biff44]

biff could you please send a hand draw of the schematic with part numbers. I am not really a circuit designer.

I could but it sounds like it will be a waste of time. Unless you understand microwave board layout techniques and have the microwave test equipement to test the same, there is no way you will get a custom 2 nS wide pulse gen to work.

Why not rent one? Or maybe just use an R-C differentiator, and pass a pulse generator with a fast rising edge thru it.

 

[steve_rb]

biff

Board is not a microwave board. It just receives a 2ns analog signal and convert it to a digital signals. This signal will be connected to pin 4 of AD9630AR IC in the input of the board using a 50 ohm coaxial cable through a gold plated connector. After that signal goes through some other ICs. I want to check inputs and outputs of these ICs and find the bad one. I checked all +Vs and -Vs voltages of all ICs and voltages are all OK. If I find the IC having no output but has correct input I can replace that and board is fixed. As I said I am not that much in electronics. I have someone here helping me but he also knows basic electronics. Board is discontinued and can't be purchased that is why I have to fix it.

I know this is a trouble but seems the best way is the circuit you suggested and I am sure drawing will help. I thought about borrowing a signal generator but couldn't find any locally.