Lecture-03 - EEE 525: VLSI Design, L-03 CMOS Modeling:...

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1 EEE 525: VLSI Design, L-03 CMOS Modeling: Basics Spring 2010, ASU Yu (Kevin) Cao, [email protected] , GWC 336 Highlight Intuitive understanding: a switch Models for a long channel transistor Threshold voltage (V th ) Current-voltage relations (IV) Reading: Chapter 2 and 3 EEE525, ASU, Y. Cao Lecture 03 - 2 -
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2 Highlight Intuitive understanding: a switch Models for a long channel transistor – Threshold voltage (V th ) – Current-voltage relations (IV) Reading: Chapter 2 and 3 EEE525, ASU, Y. Cao Lecture 03 - 3 - 3D Perspective of a MOSFET MOSFET: M etal- O xide- S emiconductor F ield E ffect T ransistor Polysilicon/Metal Gate Aluminum/Coppe Aluminum/Copper N+ EEE525, ASU, Y. Cao Lecture 03 - 4 -
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3 NMOS and PMOS Structures W D D D N-Type MOSFET (NMOS) n+ n+ L Drain Source p+ Bulk Oxide W S GB G S G S S S S P-Type MOSFET (PMOS) EEE525, ASU, Y. Cao p+ p+ n+ N-well L Source Drain Oxide D G D G D Symmetrical along width (W), but changing along length (L) Lecture 03 - 5 - Basic MOSFET Operations D NMOS S PMOS G S V GS =V G -V S >V th V >0 B G D V GS =V G -V S <V th V <0 B I ds W EEE525, ASU, Y. Cao V th : threshold voltage (>0 for NMOS and <0 for PMOS) DS >0 (V B =0) DS <0 (V B =V DD ) Lecture 03 - 6 -
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4 A Transistor in Digital Circuits A Switch! |V gs |>V th A MOSFET V gs =V g -V s R on D S D S is a non-linear function L EEE525, ASU, Y. Cao I ds V gs I ds is a non linear function of: W, L, V gs , V ds , and V th R on V/I 1/W Lecture 03 - 7 - A CMOS Inverter The simplest logic unit of digital circuits V DD V V V in
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This note was uploaded on 03/11/2010 for the course EE 525 taught by Professor Yucao during the Spring '10 term at Punjab Engineering College.

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Lecture-03 - EEE 525: VLSI Design, L-03 CMOS Modeling:...

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