Reference

• "Principles of cmos vlsi design" by Weste-Eshraghian
   
• http://www.iue.tuwien.ac.at/phd/pichler/node75.html http://www.hitequest.com/Kiss/VLSI.html
   
• CMOS: Circuit Design, Layout, and Simulation, Third Edition by Bacor, R. Jacob. Wiley-IEEE. pp. 1174. Chen, Wai-Kai (ed) (2006).
   
• The VLSI Handbook, Second Edition (Electrical Engineering Handbook) by Boca Raton: CRC. ISBN 0-8493-4199-X.
   
• http://jas.eng.buffalo.edu/education/fab/NMOS/nmos.html