有人care過bandgap可能存在不止1個degenerate points(stable points)嗎？

hi.china59 · 發表於 2009-10-3 00:59:21

有人care過bandgap可能存在不止1個degenerate points(stable points)嗎？

The degenerate point of Bandgap reference circuit
Q:有人care過bandgap可能存在不止1個degenerate points(stable points)嗎？
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

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Low Voltage Bandgap Reference Circuit
Patent number: 6489835
Filing date: Aug 28, 2001
Issue date: Dec 3, 2002
Inventors: Quan Yu, Edwin Chan
Assignee: Lattice Semiconductor Corporation

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.8 A! M/ W; y. K
This configuration differs from Banba's circuit in several ways.5 e$ n- x1 Z/ d* v* M6 Q
1. Only one resistor, RC, is added to provide an CTAT current, rather than need two such resistors.
2. Only one non-zero initial current, and this system will move to this point after power-up.

Low_voltage_bandgap_reference_circuit.pdf

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pkf690801 · 發表於 2010-7-5 14:36:10

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cgxcgx2005 · 發表於 2010-9-26 15:27:36

good
thanks for sharing.......

fish_20 · 發表於 2011-1-19 17:02:42

good!!! good!!!
thanks for sharing!!!

hoodlum · 發表於 2011-2-14 16:23:31

哇!!!從來沒想過這個問題
謝謝大大分享
趕快下載!!!!

oric · 發表於 2011-2-14 17:31:09

這是個很重要的問題~之前有遇過
謝謝樓主的分享~

lchuang · 發表於 2011-2-15 10:45:17

完全沒想過......................

zhangyunwu5555 · 發表於 2011-2-18 22:30:35

回復 1# hi.china59
a noval question thanks for your sharing!

li202 · 發表於 2011-2-28 19:00:48

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dentice · 發表於 2011-3-3 09:37:22

非常感謝分享之前做bandgap 時從來沒考慮過此問題

lhyi · 發表於 2011-3-5 02:24:41

This is really something to think about, thanks

gasol · 發表於 2011-3-8 09:19:39

好問題+好回答, 感謝大大

alkla · 發表於 2011-3-8 13:55:21

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

hitxiaojun · 發表於 2011-3-8 21:26:36

还从来没有遇到过呢。看看

hitxiaojun · 發表於 2011-3-8 21:31:39

还从来没有遇到过呢。看看

mailhwm · 發表於 2011-3-10 08:37:48

回復 1# hi.china59

若有好的 startup 來控制
還會有這問題嗎
看不到附件

u9513349 · 發表於 2011-3-27 18:37:58

I want this very important circuit for bandgap,thxs for your show!!!

kevinlin1 · 發表於 2011-4-2 10:35:29

谢谢啊，正在设计它！！！

chian · 發表於 2011-6-8 16:12:58

3Q very much
看看有什磨內容囉!!!!!!

starfish311 · 發表於 2011-6-14 16:29:04

重要，重要，重要~~~~~~~~~~~~

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