icfans
Newbie level 5
Hello, everyone. I am now designing a Class AB folded cascode fully differential opamp, and the Class AB is implemented by floating voltage source.
The spec require a PSR(Avdd=Vo/Vdd) of single end less than -50dB, but I can only get about -46dB in tt corner.
Here is my question:
1. How to improve PSR? what's the most important parameter that will affect PSR?
2. In some corners (e.g. -40 degree, ss, 0.9vdd), the PSR decrese very much to about -28dB, why?
Need for help! Thank you!
The spec require a PSR(Avdd=Vo/Vdd) of single end less than -50dB, but I can only get about -46dB in tt corner.
Here is my question:
1. How to improve PSR? what's the most important parameter that will affect PSR?
2. In some corners (e.g. -40 degree, ss, 0.9vdd), the PSR decrese very much to about -28dB, why?
Need for help! Thank you!