i am student from NIT GOA India .i am doing my final year project on VLSI optimization using convex optimization. i gone through some of GP problems which are coded in digital circuit examples. i need a little clarification on some part of program .the matlab program is based NAND GATE delay optimization in which

a line which is written as " % area definition

area = sum(w); "

i want to know exactly the meaning of that term ‘area’ it has many meanings in vlsi domain. i am confused over these terms.

1.area of whole chip.

2.area of transistor (but you are not multiplying with length of transistor).

3.sum(w) which indicates sum of all the widths in one gate but how could it gives whole area.

4.why dimension of transistor are not mentioned?

please answer.