I want to build a simple construction for measure of a two-megabit clock pulse, the clock pulse is also differential. I want to measure that the signal toggles and maybe also check the frequency. I also want to check or measure that the amplitude is correct. Can I do something with a PIC controller or with a PLD, a A/D-converter and so on??? I also have a 8kHz signal which I can use as a reference.
Yes I can use an instrument to measure the signal, but the problem is that I want to measure this frequency on a several circuit boards and in several hours. It will be too expensive to buy hundreds of instruments. Yes it is important to know if the signal rises to a proper level. Example: If the signal rises to one (1) the level should be above for example 1,5 volt and a zero (0) should be under 0,5 volt. The frequency should also be around 2 MHz, not under 1,9 MHz and not over 2,1 MHz. To indicate that something is wrong it should be OK to light an LED.
I have looked at your proposal, but I have still the problem to measure the level of the signal. Do you have any solutions for that?