Huijsing Amp current consumption problem

[sunnybear]

The following figure shows the Huijsing rail-to-rail input and output opamp.
The simulation shows 3mA current consumption, but when measurement, it has two problems: (1) it shows 7mA current consumption, much higher than simulation result. (2) it shows oscillation behavior at no load condition.

Do any of you have experience about this? What may be the reson of the fail operation? Thank you so much.

 

[oht993]

1) Did you do Transient simulation?
2) Have you checked the bias ckt in all corner and VDD?

two things that I can think of...

thanks.