" Q5 G" T& {4 d/ R0 {. w, c) ]The degenerate point of Bandgap reference circuit5 y6 k z0 v& _; u4 J1 b6 m, Y& |
Q:有人care過bandgap可能存在不止1個degenerate points(stable points)嗎？ : o) T9 b0 P: ZA: We do care the degenerate points of a bandgap reference circuit. The bandgap reference circuit needs a more effective startup circuit than those usually adopted. The crossing (degenerate) points are much less defined. Please read the attached bandgap degenerate points.pdf 0 Z, P- _0 ?+ }3 B3 @; u
. E* g# r0 T! G; Y+ C============================================================ 5 e% L5 }8 C6 E# t6 |6 ^& s4 @Low Voltage Bandgap Reference Circuit. F+ y- c: l' l( T6 o, v
Patent number: 6489835 7 c$ x% t; T& A1 ~' w7 L4 sFiling date: Aug 28, 20014 V, A9 b7 S+ E [% N
Issue date: Dec 3, 2002, a- I& W8 ~4 a1 t3 \' {4 L
Inventors: Quan Yu, Edwin Chan6 z+ g& W$ V7 `6 | i, D
Assignee: Lattice Semiconductor Corporation) u5 @# }; E" k
' i! I. ?! l P, t: Z) yBanba et al, in "A CMOS Bandgap Reference Circuit with Sub-1-V Opeation", discloses a bandgap reference circuit that can operate at supply voltage down to about 1V. This configuration needs two additional resistors, RA and RB, to generate CTAT currents. However, these two resistors will result in more than one opeating point, especially when the drain voltages of PMOS transistors, drops below ΔVbe(i.e., when the two bipolar devices are turns off). Existence of more than one opeating point makes the start-up circuit very complex, or requires an additional circuit to gurantee achievement of a proper operating point. Without such a circuit, the risk of having an undesired operating point is high.7 h, X' O' ]" m, V3 k/ E
This configuration differs from Banba's circuit in several ways.- e9 V2 D5 l2 R& G: J! [4 P7 ` 1. Only one resistor, RC, is added to provide an CTAT current, rather than need two such resistors.6 A( n4 f2 R5 T
2. Only one non-zero initial current, and this system will move to this point after power-up.* K" }0 p9 X' X5 V
8 i0 ]+ Y% H. ^Low_voltage_bandgap_reference_circuit.pdf/ ^; r0 x( z1 D K$ h
0 G( `- ^* |( ^( k+ \ 作者: pkf690801 時間: 2010-7-5 02:36 PM
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.....................................................作者: cgxcgx2005 時間: 2010-9-26 03:27 PM
good0 F. v6 _/ v5 @5 [* ]" v O% ^
thanks for sharing.......作者: fish_20 時間: 2011-1-19 05:02 PM
good!!! good!!! : V O( J( Z; n' A1 O7 h$ Zthanks for sharing!!!作者: hoodlum 時間: 2011-2-14 04:23 PM
哇!!!從來沒想過這個問題 : A/ C/ F( q4 g! m1 }謝謝大大分享! R; Q8 @" Q0 o( S7 o- |0 L/ k
趕快下載!!!!作者: oric 時間: 2011-2-14 05:31 PM
這是個很重要的問題~之前有遇過 3 l E, ^, ?6 p, N( c. p謝謝樓主的分享~作者: lchuang 時間: 2011-2-15 10:45 AM
完全沒想過......................作者: zhangyunwu5555 時間: 2011-2-18 10:30 PM 回復 1#hi.china59 1 b* Z& ?9 P& {+ q! L5 q7 Q3 Ia noval question thanks for your sharing!作者: li202 時間: 2011-2-28 07:00 PM
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..............................................................作者: dentice 時間: 2011-3-3 09:37 AM
非常感謝分享 之前做bandgap 時從來沒考慮過此問題作者: lhyi 時間: 2011-3-5 02:24 AM
This is really something to think about, thanks作者: gasol 時間: 2011-3-8 09:19 AM
好問題+好回答, 感謝大大作者: alkla 時間: 2011-3-8 01:55 PM
是個好問題!不過是個成熟技術電路~~應該避免落在臨界範圍作者: hitxiaojun 時間: 2011-3-8 09:26 PM
还从来没有遇到过呢。看看作者: hitxiaojun 時間: 2011-3-8 09:31 PM
还从来没有遇到过呢。看看作者: mailhwm 時間: 2011-3-10 08:37 AM 回復 1#hi.china59# S/ p9 ]4 b/ C1 i- e g. b
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& o, b# b7 E* Z5 t5 P/ O( `% j2 F若有好的 startup 來控制% W# R [! W- ?$ }
還會有這問題嗎5 ~- K/ B2 t; H
看不到附件作者: u9513349 時間: 2011-3-27 06:37 PM
I want this very important circuit for bandgap,thxs for your show!!!作者: kevinlin1 時間: 2011-4-2 10:35 AM
谢谢啊，正在设计它！！！作者: chian 時間: 2011-6-8 04:12 PM
3Q very much0 d, g$ z+ M& ~& U1 f+ Y. [
看看有什磨內容囉!!!!!!作者: starfish311 時間: 2011-6-14 04:29 PM
重要，重要，重要~~~~~~~~~~~~作者: c3a1t039 時間: 2011-8-9 06:11 PM
沒想過這問題，值得思考。謝謝分享作者: richpower 時間: 2011-8-19 05:18 PM
從來沒思考過這個問題 = = F; e* J. g% B$ X/ l$ X) ]看來需要好好研究一下了作者: av1014 時間: 2011-8-19 10:12 PM
good!!! good!!!: J# i) d- u$ B$ b N6 x' X6 V# m& {+ Q# ^0 K
thanks for sharing作者: spazspaz 時間: 2011-8-25 12:57 PM
謝謝提供相關文件，我來看看bandgap是什麼。作者: tuza2000 時間: 2011-9-3 05:19 PM
start up circuit!maybe that's why need it!作者: wasishower 時間: 2011-9-21 09:32 AM
Hope to see that and learn.作者: qy79 時間: 2011-9-23 09:34 AM
thanks a lot!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!作者: cchheenn2 時間: 2011-10-19 10:39 AM
太神奇了 之前都沒想過此問題的可能作者: Marten 時間: 2011-10-24 02:54 PM
沒有想過耶 來看看!感謝分享作者: IloveCT 時間: 2012-3-11 04:04 PM
thanks for sharing，Thanks a lot作者: luckyhuihui666 時間: 2012-4-13 07:55 PM
学习了……&……………………作者: a7893657 時間: 2012-4-18 06:29 PM
好物~~分享是知識的開源!!作者: wm830128 時間: 2012-4-21 04:53 PM
xiexielouzhu,jixu ,下下来看看作者: jschen 時間: 2012-4-24 11:39 AM
重要的設計觀點 針到bandgap 設計作者: filterlife 時間: 2012-4-25 04:19 PM
好問題+好回答, 感謝大大作者: sahan0912 時間: 2012-7-17 02:45 PM
這是個很重要的問題~之前有遇過 " j5 C5 j, o+ m9 J) W' h: S Y! e5 n
謝謝樓主的分享~作者: YuanII 時間: 2012-7-30 11:24 AM
感謝大大們的分享!!的確重要的一點!!!作者: lowlouer 時間: 2012-12-15 09:26 PM
蠻重要的想法8 ^" R" W; W2 j% g
感謝分享作者: sd5517805 時間: 2013-2-22 11:52 PM
從來沒想過這個問題......作者: heavenzheng 時間: 2013-2-24 12:28 PM
這是個很重要的問題~~~~~~~~~~~~~~~~~~作者: mildseven0228 時間: 2013-2-24 10:47 PM
good ' E+ ?) {, p: d* M9 u. |thanks for sharing.......作者: zdl1868 時間: 2013-3-16 01:00 PM
good!!! good!! thanks for sharing!!!作者: chris020 時間: 2013-3-21 08:55 PM
不管有幾個操作點..也能用start-up解決作者: mildseven0228 時間: 2013-4-8 10:37 PM
good0 f' @9 n1 c% `
thanks for sharing......作者: alibiwei 時間: 2013-5-22 10:27 PM
good question! + g) R( J; a% I4 d9 M9 }thanks for your sharing.作者: xyzw 時間: 2013-7-9 04:33 PM
衝一下人氣喔" ~ f- J) u D% I* ~
衝一下人氣喔 * O7 y8 k P& n: A ^衝一下人氣喔作者: pocket112 時間: 2013-10-1 09:06 PM
只考慮過一個的，再多了也不會了作者: game750219 時間: 2013-12-29 03:49 PM
Thx for share ! It is very useful !作者: yuri 時間: 2014-1-3 09:27 AM
Thank you! It's good information for me 'cause I'm struggling with this.作者: bomora 時間: 2014-1-13 10:18 AM 回復 1#hi.china59 # [( y3 m& Y% X6 n1 g& V " v1 t# F: A% ~( f$ Z % z, C' O2 B) N: r' Rgood!! 4 x. m3 A' b9 [2 l% Rthanks for sharing.......作者: xtcel246 時間: 2014-1-13 04:50 PM
thanks for sharing, good topic !作者: abner2 時間: 2014-1-25 10:03 PM
It's so helpful. . Q; B6 I' a7 S. t1 M+ SThanks for sharing!!!!!作者: spreecat 時間: 2014-7-27 11:14 AM
剛進入LDO,BG設計研究，感謝分享資料。作者: engineer 時間: 2015-2-14 08:48 AM
Of course, it may stuck at the initial state. That's why a startup circuit is required to bring the BG out of the initial state to the operating point.作者: grant7163 時間: 2015-8-5 04:47 PM
Thx for share ! It is very useful !作者: LiYingLi@FB 時間: 2016-3-3 11:50 PM
好像沒考慮過這個問題!!!- O' Y; x+ y! o. i1 c7 B$ X1 l 作者: tfkc1744990 時間: 2016-3-7 05:46 PM
最近遇到,來參考一下 2 ], K" D3 `5 F" t/ S9 e( f8 |. @) \. s4 W$ ^# P- W& C
感謝大大分享 ' q. X% h' D# i# Q作者: f4612 時間: 2016-4-21 04:27 PM
這是個很重要的問題 9 P" J' P3 J4 D6 ?" `謝謝樓主的分享~作者: 李柏毅@FB 時間: 2016-7-17 04:46 PM
