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Altera_Forum's avatar
Altera_Forum
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12 years ago

Comparator circuit with inbuilt Fixed Reference Voltage

I need to build a comparator circuit using the FPGA with minimum external components. A negative analog voltage will be input and has to be compared with a fixed voltage of -30mV to give a digi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

FPGA is a digital device! You need an external component.

Although I know a raw comparator operation can be emulated with FPGAs using differential I/Os in lvds mode, it's hardly applicable in your case, since you need to manage a negative voltage.

Pay attention: a negative voltage connected to the FPGA pins would absolutely damage it.