Differential signals applied at speed

[longpole001]

HI guys this is one i have not tried as yet , and wonder if its at all possible

i have high speed differential optic TIA (600mhz) connected to a 2nd stage amp with high gain , with outputs that are also differential at 3.3v

the output gives 15ns - 100ns pulses , which i need to count / check further in the pic for pattern / timing

is there a way that i can interface directly to the PIC todo the pattern checking and counting on a 18f 64mhz device ?

if not any other interface suggestions such that the pic could do it


Cheers

sheldon

[richard]

its hardly likely

min interrupt pulse width is 20nS
min recognition time for int on pin change is 62.5 nS (Tcyc)
you would need several uS between pulses to calculate the simplest things

[longpole001]

yep i thought as much , what i need to slow the signals down , so the pulse train is the same but at 100 times slower , not sure how i can do that

[gadelhas]

Probably FPGA is the way to go!

[longpole001]

yes i been looking at delving into those , i have a hope that the repeated pattern may be matched by a synchronizing sampler cct pulses i am expecting and as a result slow them down