How the width of PMOS and NMOS transitors is derived?

[berko3000]

Hi
I am a beginner in the VLSI layout design and confussed in the lambda based rules. For example if I have a 0.5u CMOS process based rules, how the Width of PMOS and NMOS transitors are derived?

 

[jimjim2k]

lambda rules,

Hi

Lmin = 2* lambda

W/Lmin specifies the design
W is calculated by designer.

Other DRCs are based on lambda.

The design alignment is also may be in Manhattan method.


tnx

 

[santhosh.mandugula]

lambda for pmos

This lambda and the lambda in mos current equatuins are same or different?

 

[jimjim2k]

ic design lambda rules

This lambda and the lambda in mos current equatuins are same or different?

They are two different.

lambda in layout is
Lmin = 2* lambda


lambda in mos current equation is
Channel length modulation factor
This lambda is related to 1/VA
Where VA is Early voltage


tnx