If i am expecting input signal at speed of 10 samples per second...should I look PSR at 10 Hz or at DC ??
Also for the folded cascode opamp with class AB stage i am getting a Power Supply rejection of -40 dB at DC which falls to -10 dB at 10Hz and eventually settles at flat responce of 0 dB after 1KHz ..?
how do i interpret it ? is it good, bad ? how do i improve it if I am already using cascode output stage ( giving high resistance betn +ve Vdd and output node )