|
Reply for mt7344
I would like to reply to our friend mt7344.
5 k' w0 `% t. b" R4 n/ T
; M$ N. S( r5 i9 c0 j% W0 y2 eThey are multiple factors that you need to consider
3 L+ s) a, i; {$ \4 u(1) your requirement of Bandgap accuracy. Is it a 1% or a 10% bandgap? This actually depends on how you are going to use the Bandgap reference.
% r1 W6 l) P/ Z1 [( r% \, I$ u(2) Process variations would be another factor, this is what out of our control. You can "Monte-Carlo" your circuit across the Vcc and process corners to determine your trimming ranges
2 h; {0 v" q! K1 P5 e(3) What you should control are the circuit components matching. Say the circuit posted by Mr Leonken01, matching of Q0, Q1; M0, M1, M2 and all the R are extremely important.* r6 y R; A3 e! t" @! T( ]- s
(4) Circuit structure also important, as the circuit mention above, it would be tough to match the current legs of M0, M1 and M2. Unless you need the low voltage Bandgap, I would not recommend this circuit/ q! T5 Y% k- X& {
(5) On top of all these, your trimming range should also cover the TC, second order effect% G9 O# z' x f- c1 E9 G- R$ O( i
will show up across temperature
( B6 k! G$ f# ?: T1 A! v, n& J' p, y+ H+ j" o* `1 m% }8 X( K' l
then you decide your trimming range and PAD needed.
# B% _" x% Y/ e p$ p, b- W+ G2 ~: B! v
Hopefully these help. |
評分
-
查看全部評分
|