[SOLVED] Behavior of rail-to-rail op amp

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uplifting_mind

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Hello, I need help with non-inverting amplifier.
Why amplifier on first image don´t work like one on second picture? Do rail-to-rail op amp need different design in contrast to classic LM358 on the second pic.?
Both amplifier is designed as voltage follower, but circuit with AD8032 don´t have unit gain.
Thank you.


 

Looks like it should work. Are you sure your model is right? BTW, you realize that you have a 10K in parallel with a 1K on the output, right?

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Looks like it should work. Are you sure your model is right? BTW, you realize that you have a 10K in parallel with a 1K on the output, right?
 

I tried the spice model downloaded from Analog Devices and it seems it has problem when used in single-supply mode. If you try the same circuit supplied by the dual supply +/- 5V it should work.
 
So, it will be work correctly in real circiut like schematic on first picture?
 

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