CMOS OP-AMP with Impossible Specs to meet?

Status
Not open for further replies.
A

akula1488

Newbie level 3
Joined
Dec 12, 2007
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,305
0.18 um
1.8 vdd
input CM 0.4~1.4V
output swing 0.25~1.55V
open loop > 60 dB
unit gain frequency 2 GHz

any ideas which topology I should try?
3 stage op-amp with multi path nested miller comp?

thanks
 

Hi,
Why 3 stage? It's compensation is not easy to handle. I suggest two stage with a folded cascode in the first stage for it's input CM. If you hadn't need the 1.3 V output swing you could have reached the specs (e.g. the easy 60dB gain) with only one stage.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…