window comparator using a single op-amp
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Posted by Lee on May 7, 2005, 9:41 pm
Please log in for more thread options does anyone know a circuit of a window comparator using only a single op-amp...i need a shematic for this...tnx | |||||||||||||
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Posted by Bob Monsen on May 7, 2005, 10:06 pm
Please log in for more thread options Lee wrote: Hmmm. There was a posting on sci.electronics.design recently asking for the same thing. Go look there. --- Regards Bob Monsen | |||||||||||||
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Posted by ryan wiehle on May 8, 2005, 2:22 am
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Bob Monsen wrote: > Lee wrote:
> > does anyone know a circuit of a window comparator using only a
> > single op-amp...i need a shematic for this...tnx >
> Hmmm. There was a posting on sci.electronics.design recently asking > for the same thing. Go look there. > > --- > Regards > Bob Monsen same user | |||||||||||||
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Posted by Bob Monsen on May 8, 2005, 2:01 am
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ryan wiehle wrote: > Bob Monsen wrote:
> > >>Lee wrote:
>> >>>does anyone know a circuit of a window comparator using only a
>>>single op-amp...i need a shematic for this...tnx >>
>>Hmmm. There was a posting on sci.electronics.design recently asking >>for the same thing. Go look there. >> >>--- >>Regards >> Bob Monsen >
> > same user In that case... 10V--------o--------. | | | | [220k] [100k] | | | | | | .->|--o-------(--- Inverting Input
| | |
Vin-o | | | | | '----(---|<----o-- Noninverting Input | | | | [100k] [220k] | | | | | | | | | | | | Gnd--------o--------' The output of the comparator will go high when Vin is between 2.5V and 7.5V. The things in [] are resistors. The ->|- are diodes. It should be
viewed using a fixed space font, like courier. Otherwise, nothing lines up.
You get to set the window by changing the resistor values. The low window limit is set by the left two resistors, whereas the high window limit is set by the right two resistors. As the input increases from 0, the noninverting input first follows the input at 0.7V above it. The inverting input is fixed at 3.125V. Once the input gets to be 2.5V, the output of the comparator will go high, since the non-inverting input will then exceed the inverting input (which is still fixed at 3.125V.) As the input continues to increase, once it gets to 3.125 + 0.7V, the inverting input will start to rise. It's still 1.4V lower than the non-inverting input, so the output is still high. When the input gets to 6.875-0.7V, the non-inverting input will stop increasing. The inverting input will continue to climb as it has been doing. Once the input gets to be 6.875+0.7V, the inverting input will be larger than the now fixed non-inverting input, and the output will go low. Thus, the output is high when 2.5V < Vin < 7.5V. --- Regards, Bob Monsen | |||||||||||||
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Posted by Rich Webb on May 8, 2005, 8:28 am
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wrote: >Bob Monsen wrote:
> >> Lee wrote:
>> > does anyone know a circuit of a window comparator using only a
>> > single op-amp...i need a shematic for this...tnx >>
>> Hmmm. There was a posting on sci.electronics.design recently asking >> for the same thing. Go look there. >> >> --- >> Regards >> Bob Monsen >
> same user Same homework question. -- Rich Webb Norfolk, VA | |||||||||||||
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> op-amp...i need a shematic for this...tnx