This is a very basic question. I hope it won't offend you.
One my prof in college, while giving us assignments, asked us to consider channel length of all the mosfets in the design to consider same. like L=200nm.
My question is it a good idea to set channel length (L) of all transistors same.
Also, I heard that if we vary channel length of transistors (like to get hight output resistance we may increase L) then there may be problem while making layout of the design. Can you please confirm this whether this is followed in practical analog design like in analog companies.