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[問題求助] 有人care過bandgap可能存在不止1個degenerate points(stable points)嗎?

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發表於 2009-10-3 00:59:21 | 顯示全部樓層 |閱讀模式
有人care過bandgap可能存在不止1個degenerate points(stable points)嗎?4 M% B9 }% l7 B. P$ g
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The degenerate point of Bandgap reference circuit; x2 Y. P6 i7 S/ g6 o
Q:有人care過bandgap可能存在不止1個degenerate points(stable points)嗎?7 G% c6 f% h1 n2 s% N* d
A: 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 1 B" o; T% ?8 K# @) i

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Low Voltage Bandgap Reference Circuit0 d; J# V4 v4 j7 ]0 H, J
Patent number: 6489835
0 D. J* V; M0 |7 x% xFiling date: Aug 28, 2001( ^. p6 F! R7 ^: v: }
Issue date: Dec 3, 2002
4 y# I- ?* I# ~9 E2 T) C* J5 ]5 jInventors: Quan Yu, Edwin Chan
2 I3 ]8 Q7 r2 v5 K8 Z& MAssignee: Lattice Semiconductor Corporation& x7 Q& D& q& x. x! Q
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Banba 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.1 n* Y1 ^  ^; u5 ~; |2 n
This configuration differs from Banba's circuit in several ways.# s7 ~/ h( L7 m- ^& U- r
1. Only one resistor, RC, is added to provide an CTAT current, rather than need two such resistors.
& B( @  b- E, s2. Only one non-zero initial current, and this system will move to this point after power-up., v" e: b. n" Z& w) [

' B) v- g7 e: l$ x* rLow_voltage_bandgap_reference_circuit.pdf
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發表於 2010-7-5 14:36:10 | 顯示全部樓層
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參與人數 1Chipcoin -3 收起 理由
chip123 -3 敷衍回覆!何不交流點心得?

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發表於 2010-9-26 15:27:36 | 顯示全部樓層
good3 u  X  Z+ c9 c$ }/ B4 ^
thanks for sharing.......
發表於 2011-1-19 17:02:42 | 顯示全部樓層
good!!! good!!!
7 Y- n8 e5 P3 @0 {9 g% \! pthanks for sharing!!!
發表於 2011-2-14 16:23:31 | 顯示全部樓層
哇!!!從來沒想過這個問題
% u- I2 w- g- t) V3 T; \& U* u謝謝大大分享
% }% {! N; f1 r+ p2 S" k1 s, `% o: w趕快下載!!!!
發表於 2011-2-14 17:31:09 | 顯示全部樓層
這是個很重要的問題~之前有遇過 % h; x7 [- n# v9 T- l
謝謝樓主的分享~
發表於 2011-2-15 10:45:17 | 顯示全部樓層
完全沒想過......................
發表於 2011-2-18 22:30:35 | 顯示全部樓層
回復 1# hi.china59 ( F- t; ?- I6 A1 @- ?
a noval question thanks for your sharing!
發表於 2011-2-28 19:00:48 | 顯示全部樓層
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chip123 -3 不認真回覆!浪費論壇資源!

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發表於 2011-3-3 09:37:22 | 顯示全部樓層
非常感謝分享 之前做bandgap 時從來沒考慮過此問題
發表於 2011-3-5 02:24:41 | 顯示全部樓層
This is really something to think about, thanks
發表於 2011-3-8 09:19:39 | 顯示全部樓層
好問題+好回答, 感謝大大
發表於 2011-3-8 13:55:21 | 顯示全部樓層
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
發表於 2011-3-8 21:26:36 | 顯示全部樓層
还从来没有遇到过呢。看看
發表於 2011-3-8 21:31:39 | 顯示全部樓層
还从来没有遇到过呢。看看
發表於 2011-3-10 08:37:48 | 顯示全部樓層
回復 1# hi.china59
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4 x; B; [/ y* \6 u3 H" W: b若有好的 startup 來控制
; Y: k& a" V4 ]9 H/ v% j還會有這問題嗎
3 H1 n- V. l9 R1 L0 k3 B) t看不到附件
發表於 2011-3-27 18:37:58 | 顯示全部樓層
I want this very important circuit for bandgap,thxs for your show!!!
發表於 2011-4-2 10:35:29 | 顯示全部樓層
谢谢啊,正在设计它!!!
發表於 2011-6-8 16:12:58 | 顯示全部樓層
3Q  very much
5 D* p3 H$ H' ]0 s1 s  a; t4 {看看有什磨內容囉!!!!!!
發表於 2011-6-14 16:29:04 | 顯示全部樓層
重要,重要,重要~~~~~~~~~~~~
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