how to compute the minimum gain in bandgap reference

[kollayliu]

if |Vx-Vy|<Ve ,Ve is the maximum error,how to compute the minimum gain!
thank you !

 

[rfzheng]

your schematic is wrong , and you can not get the right reference voltage.
two loops in the circuit: postive feedback loop and negative feedback loop, but your OP is in wrong connection.
the negative feedback gain should bigger than the postive feedback loop gain.

in order the balance the voltage, it is better a same value resistor at the other branch.

 

[abcyin]

hi, rfzhang
how to quantify the negative loop gain and the positive loop gain, what are the formulars of the loop gains for this schematic?

and what do you mean by "in order the balance the voltage, it is better a same value resistor at the other branch."?

Thx very much!

BR!