LM741: Offset null pin

Carlo

Part Number: LM741

Hi E2E,

How can we use or add the offset pins in a Pspice simulation of LM741? Our customer observed during the simulation that there is an offset missing and would like to add this offset by using these offset pins. Is it possible to use the offset pins? During the measurement and in the simulation the highest output voltage was nearly 15V because Vcc is 15V. However, the other measurement had a voltage of 2V and in the simulation it is -1.5V. Is this difference caused by the offset pins?

Thank you for your guidance.

Regards,
Carlo

over 2 years ago

+1 Jerry Madalvanos over 2 years ago

TI__Mastermind 26891 points

Hey Carlo,

Could you please include a schematic so we can help determine if the difference caused by offset? You can add an offset voltage to a simulation by adding a DC voltage source on one of the pins (screenshot below)

Best,
Jerry

0 Michael Steffes over 2 years ago in reply to Jerry Madalvanos

Guru 48395 points

Jerry, you should really put that offset in series with the V+ input, across the inputs shorts out the op amp inputs

0 Jerry Madalvanos over 2 years ago in reply to Michael Steffes

TI__Mastermind 26891 points

Michael,

Thank you for catching that. I'll fix the above post!

Best,
Jerry

0 Carlo over 2 years ago in reply to Jerry Madalvanos

TI__Expert 7715 points

Hello Jerry,

The problem is solved now. Our customer did another measurement and observed that the difference between simulation and measurement is the offset because the second measurement is equal to the simulation.

Thanks for the help.

Regards,
Carlo

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LM741: Offset null pin