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This task would typically be performed by an external comparator, and the comparator output (a logic level) routed to the FPGA.
What are you trying to do? Perhaps I can offer an alternative solution.
Cheers,
Dave
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Trying to design temperature sensor, it would require varying input voltage at some comparator. The design ought to be typically digital and inbuilt in the FPGA, so using an external comparator would not be an alternative. Do u think a voltage-to-frequency converter using linear voltage controlled oscillator would suffice???
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