how to measure of output common mode range of diff opamp

[manissri]

hi
i am desinging the folded cascode diff output opamp with gain boost.
how i measure the output common mode range of differential output .
in books the output common mode range of single ended output opamp is given .
plz tell the measurement of o/p common mode range of diff output.
waiting for ur reply...
manish

 

[sunking]

sweep the output common voltage, make sure all the transitor are not in linear area

 

[huojinsi]

Under the condition of spec,sweep the ouput common voltage. When the upper output transistor and lower output transistor aren't in the active or linear region,the range of sweep voltage is corresponding to the range of common voltage.

 

[manissri]

hi sunking,
my supply voltage is 0- 5 Volts
and my output common voltage is 2.5 volt.
plz elaborate that what is the condition of input voltage when i will sweep the output voltage from 0- volt.
and what will i get at the out put when i sweep the V0+ and V0- from 1 -5 volt.
waitting for ur reply ..
manish