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Please explain how these two 2stag op-amps work differently

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yonzzan

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On the first one, NMOS is connected to 1st stage while PMOS is connected to 1st stage in the second one. How does the change effect to this circuits?
 

Re: Please explain how these two 2stag op-amps work differen

In the first the capacitor makes the level shifting and the use of NMOS is better due to the higher gm for the same current than in the second case. That means the first case will be better in terms of stability with less current since this is a two stage topology.

Bastos
 

Re: Please explain how these two 2stag op-amps work differen

For more details, please take a look at the following paper. You can find out advantages and principles.

P. Hurst, S. Lewis, J. Keane, F. Aram, and K. Dyer, "Miller Compensation Using Current Buffers in Fully Differential CMOS Two-Stage Operational Amplifiers," IEEE Trans. on Circuits and Systems I, pp. 275-285, Feb. 2004.
 

Re: Please explain how these two 2stag op-amps work differen

for slew rate, output swing and speed, the first opamp is better, i think
 

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