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Design >> Analog Design >> source follower channel length modulation effect
https://designers-guide.org/forum/YaBB.pl?num=1241012244

Message started by LeeX on Apr 29^th, 2009, 6:37am

Title: source follower channel length modulation effect
Post by LeeX on Apr 29^th, 2009, 6:37am

I am trying to design a PMOS source follower (simple source follower circuit with two PMOS transistors).
The desired input range is from 0.1 v to 0.6 v.

The problem is, for such a large input range, the channel length modulation effect is quite severe. Because of that, when the input is 0.1 v, I might get an output of 0.55 v, but when the input is 0.6 v, I might end up with 1 v at the output.

Is there any way to mitigate this problem, other than increasing the transistor length?