How remove DC in output?

[khorramrouz]

Hi All
I designed an OTA which called Recycling folded cascode.a Dc voltage in output nodes
degrades the swing.as i use a dual power i want the Dc be Zero. thanks for yiur idea

 

[victoriya]

whold you please explain more .do you mean of dual power two supplies (vdd & vss )? if so, you have to design your circuit in such a way that the output common mode level becomes zero not to remove it.

 

[diarmuid]

Are you referring to basic ac coupling i.e. block the DC with a cap???

 

[khorramrouz]

yes the output node voltage should be zero but in my design with vdd=1 and vss=-1 , the dc voltage is 416mv and possitive swing will be cuted

n IC design i think use of capacitor effects on size and freq. respons