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Newbie level 4
Hi
I have a specification as high gain (80db), fast settling few ns, good PM.
I have gone through several topolgoies. One of them I am considering now is from Huijsing's book having a folded mesh with a minimum selector.
If I use Regular PMOS NMOS devices I can't manage to keep all of the transistor in saturation as there is less voltage headroom.
Instead I used high performance low threshold devices. Still I am not reaching the specification.
So far I have 60db gain with 550mv of output swing, 500uw DC power with high performance device. I can't increase the gain because then I have to compromise with my output voltage swing.
by using regular devices I am only getting 40db gain. Could you please help me about this? I am missing something really important as I am a beginner with the analog design. Any simplest feedback will be appreciated
I have a specification as high gain (80db), fast settling few ns, good PM.
I have gone through several topolgoies. One of them I am considering now is from Huijsing's book having a folded mesh with a minimum selector.
If I use Regular PMOS NMOS devices I can't manage to keep all of the transistor in saturation as there is less voltage headroom.
Instead I used high performance low threshold devices. Still I am not reaching the specification.
So far I have 60db gain with 550mv of output swing, 500uw DC power with high performance device. I can't increase the gain because then I have to compromise with my output voltage swing.
by using regular devices I am only getting 40db gain. Could you please help me about this? I am missing something really important as I am a beginner with the analog design. Any simplest feedback will be appreciated