Hi, I had been doing the AC analysis and also transient for the below circuit and I found out that the value calculated and simulated using LTSpice is totally different. Not only the value but also the graph it looks very weird to me, is there any reasons or theory which may caused this?

 

hi DC,
This is what I see, modified the AC analysis parameters.
Post your AC analysis.

E

 

hi DC,
This is what I see, modified the AC analysis parameters.
Post your AC analysis.

E
View attachment 270172

Hi, below are my AC analysis (calculation)

 

Hi, below are my AC analysis (calculation)

I not sure whether any of my formula is wrong or its already correct here, cause the value still have a big differences here

 

Hi, below are my AC analysis (calculation)

 

It looks to me that you did not analyze the small-signal model at all. But what you did, was that you apply a formula (equation) from a book without thinking about it.
Is this equation (from the book) apply to the case you have? The answer is No.