How to generate bias voltage for OpAmp...

Status
Not open for further replies.
F

firsttimedesigning

Full Member level 1
Joined
Jul 4, 2007
Messages
97
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
2,241
I am looking for a circuit that can generate the bias voltage for the opamp that I have designed...so far that circuits I have looked at are either supply or temperature dependent...is there any circuit out there that does not use diode and can generate the bias voltage for opamp?
 

You can use a peaking voltage ref (check G&M) or you can use a VT reference from the MOS Threshold voltage.
 

thank you for replaying...but i dont see any peaking voltage ref...the only thing i saw is peaking current ref...maybe i can get the voltage that i want by putting a resistor on top of M2 but the thing i am worried about is that when i fabricate the chip, the resistor might have a 20% error in the resistance.....
 

Why do you need the bias voltage?

bias current is OK, what you truely need is just current.
 

Sorry - I meant to say peaking current reference.
You're correct that you might see some process spread if you use something like a resistor. You could get around that by biasing with an off-chip resistor, if that is an option.
 

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…