why my bandgap voltage looks like below?

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banosey

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My bandgap works fine with supply 1.8 v.However below this value of the supply the output voltage looks like the attached picture.(note: the image is taken with supply=1.65v)

SO, what is the problem?

Note i use banba topology as shown[/img]
 

I may be wrong, but I think that it needs a startup circuit. The circuit has two stable states - you need to ensure it works in the correct state.

Keith
 

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    banosey

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I've already put a start up circuit.
 

I cannot see one in the diagram. Your plot looks very much like a bandgap without a startup circuit (or a startup circuit that doesn't work properly).

Keith
 

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    banosey

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Because this bandgap suffers from a few problems at low temperatures.
Find them here
 

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    banosey

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thanks all
it was just a start up circuit problem(changing the startup circuit)
 

Hi hello please give me some suggetions how to interface optical mouse to digital display to measure the movement of mouse
 

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