jcpu
Full Member level 4
It's about die to die varaiation of VBG:
We know major VBG variation come from
(1) MOSFET mismatch from current mirror & error amp input stage
(2) Vbe mismatch
(3) resistor mismatch
Question is: some trying to reduce the effect of Vbe mismatch
by increasing the BJT ratio up to 12:1 or more.
Does that idea really useful?
Anybody has experience about this?
Thanks in advance.
We know major VBG variation come from
(1) MOSFET mismatch from current mirror & error amp input stage
(2) Vbe mismatch
(3) resistor mismatch
Question is: some trying to reduce the effect of Vbe mismatch
by increasing the BJT ratio up to 12:1 or more.
Does that idea really useful?
Anybody has experience about this?
Thanks in advance.