lecture3 - ECE520 VLSI Design Lecture 3: More MOS Physics...

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1 ECE520 - Lecture 3 Slide: 1 University of New Mexico Office: ECE Bldg. 230B Office hours: Tuesday 2:00-3:00PM or by appointment E-mail: payman@ece.unm.edu Payman Zarkesh-Ha ECE520 – VLSI Design Lecture 3: More MOS Physics ECE520 - Lecture 3 Slide: 2 University of New Mexico Review of Last Lecture “Static Parameters of Long Channel MOSFET” MOSFET Operational Regions Cutoff region Depletion region Inversion region Linear region (inversion) Saturation region (inversion) Basic MOSFET Parameters Threshold voltage Body effect Channel length modulation
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2 ECE520 - Lecture 3 Slide: 3 University of New Mexico Today’s Lecture “Dynamic Parameters of Long Channel MOSFET” MOSFET Parasitic Capacitances Overlap capacitances Channel capacitances Junction capacitances ECE520 - Lecture 3 Slide: 4 University of New Mexico Threshold Voltage Equation (Correction!)   F BS F T T V V V 2 2 0 ox si A C qN 2 ox ox ox t C ox ox ox F si A F ms T C Q C qN V 2 2 2 0 i A F n N Ln q KT Where: and Zero body bias threshold voltage: Threshold voltage with body bias: Where: Important Facts: Body bias increases threshold voltage Threshold voltage is positive for normal NMOS Threshold voltage is negative for normal PMOS
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3 ECE520 - Lecture 3 Slide: 5 University of New Mexico 0 0.5 1 1.5 2 2.5 3 00 .
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lecture3 - ECE520 VLSI Design Lecture 3: More MOS Physics...

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