ua741 input offset voltage simulation

[sunli567]

ua741 offset

hi, i meet a question when i do this simulation.
i use following test circuit to analyse the offset voltage of us741. But the result is strang. Output equals to 0 when input is 0.19uv. But in its datasheet, this voltage should be 5mv.
Could you point my mistake, please?
Thanks!

 

[FvM]

offset voltage simulation

Read the datasheet more thoroughly! I surely doesn't say, the offset voltage should be 5mv. It may be up to +5mV or -5mV, typically it's less. Simulation models may assume any arbitary value, some have a considerable offset, others don't.

 

[sunli567]

offset ua741

Thanks for your reply. In the datasheet, it mentions MAX offset voltage is 5mv and TYP is 1mv. So the limitation is +/-5mv and the different test circuits get different offset voltage results. Could anybody provide the other test circuits please?

 

[FvM]

ua741 offset application

I don't understand which test cicrcuits you're refering to. Many OP model have a VOS model parameter, that can be overriden in the device instantiation to operate the circuit at different OP offset voltages.