gianbo85
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Hi Everybody,
for a university project I have the need to check for the presence of a trigger-in signal in my apparatus.
- The signal is a digital clock with a variable frequency in the range 1MHz - 50MHz.
- I can detect this signal either from the negative output of a LVPECL XOR (Low level at 1.6V, High Level at 2.4V) or from the output of an opamp (Low level at 0V, High level at 200mV)
- I just need to generate a high/low level to send to a PIC microcontroller in case the trigger in signal disappears.
Any Idea? I thought about a superdiode (opamp+diode) plus a tuned RC circuit and a comparator in the end (see picture).
SInce space on my pcb is a problem I would like to find a simpler circuit without the use of two opamps!
Thanks
Gianluca
for a university project I have the need to check for the presence of a trigger-in signal in my apparatus.
- The signal is a digital clock with a variable frequency in the range 1MHz - 50MHz.
- I can detect this signal either from the negative output of a LVPECL XOR (Low level at 1.6V, High Level at 2.4V) or from the output of an opamp (Low level at 0V, High level at 200mV)
- I just need to generate a high/low level to send to a PIC microcontroller in case the trigger in signal disappears.
Any Idea? I thought about a superdiode (opamp+diode) plus a tuned RC circuit and a comparator in the end (see picture).
SInce space on my pcb is a problem I would like to find a simpler circuit without the use of two opamps!
Thanks
Gianluca