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self biased opamp in LDO (Read 4329 times)

grosser Community Member Offline Posts: 57	self biased opamp in LDO May 08^th, 2006, 5:06am hello could you tell me how to design a startup circuit in attached schematic? bias current depends on load current. without startup circuit M0 goes into cutt-off regards
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zhonghan Junior Member Offline Posts: 16 china	Re: self biased opamp in LDO Reply #1 - May 11^th, 2006, 2:00am in attachment is my reply ,all scales of transistors are not correct .
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grosser Community Member Offline Posts: 57	Re: self biased opamp in LDO Reply #2 - May 12^th, 2006, 2:38pm how is the opamp's bias current set? M3's drain voltage is set to Mout give wanted load? this drain voltage determines M3's current andso on?? what if load current IL is small? regards
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: self biased opamp in LDO Reply #3 - May 15^th, 2006, 6:30pm Hi, Grosser, There are many descriptions about start-up circuits in some textbooks. I think they could be used in your self-biased opamp. Please select one book in Designer's Guide Book List. http://www.designers-guide.org/Books/ Best regards, Yawei
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