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Reply for mt7344
I would like to reply to our friend mt7344.
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% J3 N4 M$ F+ W% K1 ~They are multiple factors that you need to consider
/ D$ l4 n, R- B# t+ L0 P(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.) S+ t z' d4 p+ g5 M Y8 O
(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
/ u1 D- m4 Y% A Z5 F& v5 s( r8 f(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.) k8 z3 x+ p% z( ^6 I
(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 circuit3 ^) [7 A0 x# H- \2 u- Y' X
(5) On top of all these, your trimming range should also cover the TC, second order effect
4 W6 b' a2 p: g" `# K7 }! P# U' twill show up across temperature+ H1 E& \' `# Q: ]% z6 N
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then you decide your trimming range and PAD needed.
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Hopefully these help. |
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