How to improve the psrr of a bandgap circuit?

Status
Not open for further replies.
H

holddreams

Full Member level 6
Joined
Aug 2, 2005
Messages
351
Helped
15
Reputation
30
Reaction score
7
Trophy points
1,298
Location
Shanghai
Activity points
4,237
How to improve the psrr of a bandgap circuit?
Does the psrr depend mainly on the opamp?
 

To my knowledge, the bandgap reference is quit okay on PSRR, it is the circuit which you connect up to it that is the issue at hand. I think if some form of better current mirror i.e (cascode config) is used to increase the impedance seen from the supply to the circuit which the bandgap reference is connected to, the PSRR would improved.
 

Use cascode current biasing, if not enough, use RC filter after the bandgap generation.
 
i agree:cascode architecture is best.
 

By putting small value of coupling capacitor can also improve psrr at higher frequency. This journal might be useful

-cheers-
 

1)casecode structure (impractical for low supply)
2)big L
3)RC filter is not used widely
4)local supply is better stucture but need more area
 

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…