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Mix-signal simulation is highly depend on the simulation tool.
The ADMS of Mentor Graphics is very good mix-signal tool. It is powerful and simple.
If you have the software ADMS, these documents of ADMS_gs.pdf and ADMS_ur.pdf can help you to do mix-signal simulation.
CMFB
1.Cut off a loop shall be keep the load effect as before cut off this loop, that mean the DC value shall be keep as before.
2. The better cut off node in the loop is the side of the node is the lowest output resistor and the other side of the node is the highest input resistor.
3. I think...
dc analysis of OTA
In gray's book, the last chapter discuss how to design full differential OPAM. I think it will help you to chose the vcm of the OTA.
latch up means there is a positive feedback has been occured.Most time latch up means thatthere is a PNPN structure which has been triggered and then there is big current flow from VDD, the chip will be brocken
As pillar_chen write, first you shuold build the opam as a voltage follower ,second chang the input dc voltage of the follower and do ac simulation under diffirent dc voltage, last you will find out that when the input dc voltage lower or higher than two certain voltages, the follower can not...
When you do some signal analog layout, the matching and shielding should be considered, and when you do some power analog layout, the safe of the device should be considered.
By the way many tools can help you do some digital layout but analog layout design is a art which more depend on the...
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