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Reply for mt7344
I would like to reply to our friend mt7344.
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They are multiple factors that you need to consider
8 `) b2 |. G4 m, n) W(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.
" Y7 ^; _8 Z; B6 x# U4 N" W# O( r(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/ M- a( O1 |/ i& l9 i0 n) Y
(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. G+ k- I6 U g% K0 j. @; B: w
(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# f* y# H: f# X$ `
(5) On top of all these, your trimming range should also cover the TC, second order effect: t1 a& a/ b* c, c6 z
will show up across temperature" B# y( }4 _8 h Q2 c
/ q; z9 X" d# C7 r* f1 x0 U+ Cthen you decide your trimming range and PAD needed.) W( s7 |; F$ g" `1 |4 a% W
+ [( N& l0 X* J" }" I6 ?Hopefully these help. |
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