OPA140 simulation error ?

SciMan

Other Parts Discussed in Thread: OPA140, TINA-TI

Dear all

I used TINA-TI to simulate OPA140 in voltage follower configuration with +/-10 V swing of sine wave. The power supplies were +/-12V.

I see that the output gets clipped around 9.2 V (ie, -2.8 V below V+). Seems strange, because as per data sheet, it should not

clip till 11.8 V of input. See the attached sheet of DC transfer curve and transient curve. Am I making mistake somewhere ?.

Thanks,

--sm

over 13 years ago

0 Bruce Trump over 13 years ago

Guru 21975 points

SM,

When used as a unity-gain follower the output is limited by the input common-mode range of the input stage. In a gain configuration you will get more output swing. The tested and assured common-mode range extends to within 3.5V from the positive rail. The macromodel performance is generally set to reflect the typical performance or about 2.8V from the rail.

Regards, Bruce.

0 SciMan over 13 years ago in reply to Bruce Trump

Prodigy 90 points

Thanks Bruce. That explains it.

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OPA140 simulation error ?