i am just design a envelop detector....input is given from FPGA 10nf to 20ns..
i have to strech this pulse train in some millisecond..
please suggest me...values of capacitor & resisto and which type of diode will give me desirable input...
please tell me briefly..

thank you.
Mohammad Fahim Raja

 

We need a lot more information to help with this,my friend.

I assume you have a modulated envelope which you are detecting.
If that part is working OK,we can probably address the pulse stretching problem separately.
A lot of the people on this forum are more focussed on that area,rather than the RF part.