Lecture 4: CMOS Transistor Theory

introduction to cmos vlsi design Lecture 4: cmos Transistor Theory David Harris, Harvey Mudd College Kartik Mohanram and Steven Levitan University of Pittsburgh cmos vlsi design 3: cmos Transistor Theory Slide 2 Outline q introduction q MOS Capacitor q nMOS I-V Characteristics q pMOS I-V Characteristics q Gate and Diffusion Capacitance q Pass Transistors q RC Delay Models cmos vlsi design 3: cmos Transistor Theory Slide 3 introduction q So far, we have treated transistors as ideal switches q An ON Transistor passes a finite amount of current Depends on terminal voltages Derive current-voltage (I-V) relationships q Transistor gate, source, drain all have capacitance I = C ( V/ t) -> t = (C/I) V Capacitance and current determine speed q Also explore what a degraded level really means Digital Integrated Circuits2nd Devices MOS Transistors - Types and Symbols D S G D S G G S D D S G NMOS Enhancement NMOS PMOS Depletion Enhancement B NMOS with Bulk Contact Digital Integrated Circuits2nd Devices The MOS Transistor Polysilicon Aluminum Digital Integrated Circuits2nd Devices Controlling current flow in an nFET.

3: CMOS Transistor Theory CMOS VLSI Design Slide 3 Introduction q So far, we have treated transistors as ideal switches q An ON transistor passes a finite amount of current – Depends on terminal voltages – Derive current-voltage (I-V) relationships q Transistor gate, source, drain all have capacitance

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  Lecture, Introduction, Design, Theory, Transistor, Cmos, Lecture 4, Vlsi, Cmos vlsi design, Cmos transistor theory

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