avlsi wrote on Mar 21st, 2007, 1:29am:Hi all,
As we increase the channel length, why is that the threshold voltage decreases? What is the reason behind this?
Thanks in advance.
There are many factors that influence the threshold voltage. Some basic ones are described in books like "Design of Analog CMOS Integrated Circuits".
http://www.designers-guide.org/Books/Personally I don't even want to know all the physics behind it.
There is only one reliable way to make sure that two transistors have about the same (nominal) threshold voltage. Use identical parameters and layout.