The books writed by Razavi and the book writed by Alle

[wjxcom]

There have a difference in the books writed by Razavi and the book writed by Alle. Both these two book discuss Miller compensate, but there have a difference that puzzles me.

In the book writed by Allen, the equation 6.2-54 explain that the second pole P2 increase Gm multiply Rds, where Rds is the channel resister of M8.
but in the book writed by Razavi, the equation 10.43 explain that the second pole wp2 increase Gm multiply Rs, where Rs is the output resister of the first stage OP.

so I think this is a problem.

 

[mohazaga]

Hi,

So which one of them is right?

 

[wjxcom]

sorry, I do not know which on is right either

 

[xwcwc1234]

The fast way to check which one is right is to simulate the circuit hsing spice . Then , you can find the answer easily.

Added after 1 minutes:

The fast way to check which one is right is to simulate the circuit hsing spice . Then , you can find the answer easily.