Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

ugb of single ended differential amplifier used as CMFB of main opamp

Status
Not open for further replies.
P

pankaj jha

Full Member level 3
Full Member level 3
Joined
Apr 16, 2010
Messages
170
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,298
Location
jaipur
Visit site
Activity points
2,457
hello everyone...
is it necessary to have the UGB of single ended differential amplifier used as CMFB of main opamp to be equal to the UGB of the main opamp ????
Is there any specific crieteria???
 

The common mode gain of an amp stage across frequencies depends on the ugb of the cmfb loop of that stage. In two stage amps, the differential loop forms a positive feed back for common mode signals. Hence it is essential to ensure that the common mode gain of your open loop amp is less than one across frequencies, which means that the cmfb should have enough bandwidth. It is not necessary that the ugbs should be same.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top