I used Cadence to simulate two designs of linear regulators... One used a PMOS device as the pass transistor while the other used a NMOS pass transistor. The error amplifier had same gain.
The plot of PSR show that there is a peaking in the response. However the peak for PMOS pass transistor is -5dB but for NMOS its -25 dB. Why NMOS has better PSR peak than PMOS?
yes I used NMOS as source follower and I understand that I got better performance. Can you explain it in a bit more detail why the improved performance?
Added after 26 minutes:
I guess its because that using NMOs gives a low output impedance over wide frequency range as compared to PMOS ?