Em 16/12/2010 16:15, V G escreveu:
> Hey all,
>
> I tried googling this, but got no answers.
>
> What happens when both inputs of an analog voltage comparator are equal i=
n
> voltage? What will the output be? Wikipedia says:
>
> - > + : output is negative
> + > - : output is floating
>
> But it doesn't say what happens when the inputs are equal.


It is very unlikely that both inputs will be at *exactly* the same
voltage. Any micro-volt may be enough to offset the result to one or the
other value.

More, there is unbalance in the comparator inputs (sometimes several
tens o millivolt) and sometimes one input is above the other and the
comparator sees the opposite.

If your inputs are really very, very close (as seen by the comparator),
any noise may make the comparator change state and you may get oscillations=
..


Best regards,

Isaac

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