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comparator has higher reference voltage than vdd

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hi
do you know how to design the comparator has higher reference voltage than vdd?

this is my spec:
vdd : 0.8v
reference voltage : 1.3v
input range : 0 ~ 2.5v

is it possible?
 

Hi
I'm not sure it's a suitable solution , but you can decrease your input voltage and reference to appropriate level with the help of resistive divider, for example.
Regards.
 

Thanx, but that spec should not be changed.
And I can not use resistive divider because of the loss.
It's very difficult problem...X(
 

You can convert your input range 0 to 2.5 ------> 0 to 0.8 or 0.7 by using op-amp with out changing the nature of your input. Similarly you can change the reference also. In this case you don't need to worry about your spec because for outside you are using the same input range but inside you are converting into your supply range.
 

It's mainly a question of achievable threshold voltages in your IC process. And the inputs can't be protected against positive overvoltages in the usual way.
 
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