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Comparator error budget

Naresh Varikuntla
Prodigy 20 points
Other Parts Discussed in Thread: LMV7271

I tried a circuit to convert sinewave (let say 50hz) to rectangular pulse signal using non inverting comparator with upper threshold and lower threshold symmetric around 0V. So i calculated the resistor values assuming comparator as ideal . But when i tried simulation with the real comparator, i got around 20mV difference between upper threshold and lower threshold( upper threshold as 950mV and Lower threshold as -970mV , ideal values are +/-960mV). So i would like to know causes for this error.Please let me know if you have any solution to reduce the error.

  • 0
    TI__Guru* 93105 points

    Hi Naresh,

    Do you have a schematic? Which comparator product are you attempting to apply? TI has comparator products available from three different linear product groups. An Applications Engineer who is associated with the particular comparator you have selected should be able to assist you.

    There is a good write-up on comparator hysteresis in the LMV7271  data sheet, page 10, Application Notes section. Review your circuit's hysteresis plan and results, and make sure they comply with the information found in that section.

    Regards, Thomas

    PA - Linear Applications Engineering