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How do I make an output go high at exactly 0V?

B

Boris

Jan 1, 1970
0
Hello!
When I´m using a comparator, the output goes to +Vcc when V+>0 (V-
grounded) and it goes to -Vcc when V+ is less then V-(V- Grounded). Is
there a configuration that makes an output goes high at exactly 0V? I
know EXACTLY 0V doesnt exists, so, maybe output go high between 0,03V
and -0,03V. For Vi > 0 or Vi <0, the output should be zero.
Regards
Boris
 
J

Jim Thompson

Jan 1, 1970
0
Hello!
When I´m using a comparator, the output goes to +Vcc when V+>0 (V-
grounded) and it goes to -Vcc when V+ is less then V-(V- Grounded). Is
there a configuration that makes an output goes high at exactly 0V? I
know EXACTLY 0V doesnt exists, so, maybe output go high between 0,03V
and -0,03V. For Vi > 0 or Vi <0, the output should be zero.
Regards
Boris

Think about it. Surf for window comparator. Use two comparators and
wire-OR the result.

...Jim Thompson
 
P

PeteS

Jan 1, 1970
0
Jim said:
Think about it. Surf for window comparator. Use two comparators and
wire-OR the result.

...Jim Thompson

<<Think about it. Surf for window comparator. Use two comparators and
wire-OR the result. >>

And if it's a jittery or slow signal make sure you use some positive
feedback for hysteresis (which can reduce your comparator requirements
to 1).

Cheers

PeteS
 
Boris said:
Hello!
When I´m using a comparator, the output goes to +Vcc when V+>0 (V-
grounded) and it goes to -Vcc when V+ is less then V-(V- Grounded). Is
there a configuration that makes an output goes high at exactly 0V? I
know EXACTLY 0V doesnt exists, so, maybe output go high between 0,03V
and -0,03V. For Vi > 0 or Vi <0, the output should be zero.
Regards
Boris

Search for "zero-crossing detector".
 
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