@ rajdeep :
1 --> Larger the device, lesser the mismatch....
2 --> Larger the length, lesser the channel-length modulation effect, means larger the ro, so lesser the mismatch in ro coz of mismatch in farication of L....
3 --> W/L ratio is governed by your ckt design, while mismatch dictates your Area, so since the ratio is fixed, you generally have to increase L. You can also change W/L ratio to improve mismatch and save on area but then you relax on some spec,say vgs/vds/ro of that particular MOS.
--> Didnt understand the second para of your post
Quote:Just wonder, if for same area increase is it more prudent to increase both W and L, rather than increasing only one of them? Well, I think that anyway has to be done, as W/L ratio will be governed by something else. But just wondering if no such restriction is there on the ratio!! :-/
For same area, how can you increase both W & L ?
One has to decrease to increase the other....
For answer on W/L restrictions, see point 3.
--mayank