Some question about the different results from ac analysis and transient analysis

[haoyang93]

Hi,

I am now using Multisim to simulate the behavior of an op amp LM324A. But the result of AC analysis and transient analysis is different.

1, In the first case, it is ac analysis which operates between 1 to 500kHz and from the result below, the amplitude of the output waveform is increasing with the frequency.

2, But when it comes to transient analysis with a 1V input at 500kHz, the amplitude is about 200mV which is a conflict with the result of ac analysis who has 525mV at 500kHz.

And here is the result of the second case:

Could anyone explain to me why the result behaves like this? The simulation circuit is attached below. 

Thank you!

Best regards,

Haoyang

[Nrojas]

What is the expected result?

Here is some more info on this analysis:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YH7lCAG&l=en-US

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YH7bCAG&l=en-US