Braski
Full Member level 3
- Joined
- Dec 22, 2009
- Messages
- 154
- Helped
- 32
- Reputation
- 64
- Reaction score
- 28
- Trophy points
- 1,308
- Location
- Florence (ITALY)
- Activity points
- 2,384
Hi,
i was wondering if a worst case phase margin of 40 degrees can be enough for a CMFB in a fully differential amplifier. Due to topology, it is not easy to increase it furtherly. Transient response shows only very limited ringing in response to step on the CM reference.
Then, how could it be than the phase margin of a common mode feedback has a minimum for a specific load capacitance, then increases for larger? this is not intuitive
i was wondering if a worst case phase margin of 40 degrees can be enough for a CMFB in a fully differential amplifier. Due to topology, it is not easy to increase it furtherly. Transient response shows only very limited ringing in response to step on the CM reference.
Then, how could it be than the phase margin of a common mode feedback has a minimum for a specific load capacitance, then increases for larger? this is not intuitive
