[SOLVED] Two stage opamp design

[MEDIPALLY NAVEEN KUMAR]

How to design a two stage opamp with the following specifications?

1.Gain =1000
2.Input reffered offset = 5 to 10µv
3.Phase margin=above 60dB

give me the complete design process

 

[aryajur]

Usually you would need more specs like what is the supply voltage minimum and what is your process threshold voltage. Should the compensation be internal or should the output pole be dominant (if it drives capacitive loads). Input common mode range? Output swing? Differential or single ended output? Output drive capability?
Knowing these you can make a better choice on a topology like simple differential first stage or a folded cascode and on a output stage. Then you can start the process.

 

[kwkam]

read books, there are no free lunch in this world

 

[dxt78]

I assume you mean 60 degrees for PM, not 60dB. For the specs you've given, a standard two-stage Miller compensated op amp will do.

You can look at the following references:
**broken link removed**
https://users.ece.gatech.edu/pallen/Academic/ECE_6412/Spring_2004/L160-MOSOpAmpDesign(2UP).pdf