why my bandgap voltage looks like below?

[banosey]

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]

 

[keith1200rs]

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

 

[banosey]

I've already put a start up circuit.

 

[keith1200rs]

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

 

[saro_k_82]

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

 

[banosey]

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

 

[Hemantha]

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