| ??? 06/10/12 22:49 Read: times |
#187653 - Impulse Tests are better Responding to: ???'s previous message |
Mahmood Elnasser said:
I used the DCM of my FPGA and raised the frequency to 300MHz , both scopes went blind and I know that the FPGA board is still working because the push button switches and LEDs are still functional.
If you have a 300MHz FPGA board, the best test waveform is not to go for pure frequency, but to output something moderate like 1MHz at 50% duty cycle on one pin, and on a second pin, create a same frequency, but PWM variable width impulse, which you should be able to do in ~3ns steps. Trigger on the 'easy' waveform, and take amplitude points on the impulse as it narrows, then try to trigger on the narrow pulse. Check on the Logic channels as well, they should have less analog-bandwidth issues. A good scope will glitch capture right up to the sampling limit. |
