comparator circuit design?

[ithink]

hi, i am thinking about design of comparator,which has 5v source supply. Input voltage of comparator varies from 0 to 5v. if we consider PMOS or NMOS transistor as input, the output will not be right respective. We should consider pmos and nmos transistor as input synchronously, but i have no circuit schematic.
Could you have designed similar comparator offer some method and document to me?
thanks
ithink

 

[feier0251]

can you describe your circuit more particularly?
there are too less information

 

[ithink]

hi, feier0251
In word, i wish the comparator operate both low voltage(groud) and high voltage(vhh), so input transistor of comparator should be pmos and nmos transistor. when input voltage is low, pmos transistors work;when input voltage is high, nmos transistors work.
are you clear my view?

thanks
ithink

 

[sunking]

use a rail to rail opa as comparator.
and you can find many paper about it in this board.

 

[dumbfrog]

download John&Martin's book and Allan's book.
Both have a good chapter on comparators

 

[Davood Amerion]

Hi;
I agree with sunking.
you can get and reading rail-to-rail op-amp datasheet.
in some of datasheet have detailed internal schematic, and you
can investigate that circuit.

Regards
Davood Amerion

 

[ithink]

hi,sunking
i have designed the comparator that i need according to the rail to rail op.
thanks
best wish!
ithink

 

[tuza2000]

congratulations!
wish you be succeed!

regard