anishsingh
Junior Member level 2
Hi , I have tried to make a low pass filter of sallen key topology with a folded cascode OTA + a common drain stage and resistive feedback. The frequency response is coming out to be correct and phase margin of around 70 deg. But giving a step i/p from 0 to 1 volts, i get a spiky response which settles to its initial value, which seems to be wrong !
I wanna know wat's wrong there ! A good phase margin should mean a little overdamped rise to the higher step value and NOT a settling down to lower level !!
Plzz Help !!
I wanna know wat's wrong there ! A good phase margin should mean a little overdamped rise to the higher step value and NOT a settling down to lower level !!
Plzz Help !!