lecture3 - MOSFET Capacitance SPICE EECS 312 MOSFET reading...

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EECS 312 1 MOSFET Capacitance SPICE EECS 312 MOSFET reading: Chapter 3 Reading for next time: 1.3, 2.1, 2.2
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EECS 312 2 Last Lecture • Wrapped up MOSFET operation • You should know the I-V and C-V characteristics of modern MOSFETs • Abstractions – Knowing transistor drive strength (I dsat ) – Calculating device capacitances – More abstractions as we go along in this class • Helpful MOSFET operation applet for review: http://jas.eng.buffalo.edu/education/mos/mosfet/mosfet.html
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EECS 312 3 Lecture Outline • Capacitances on a MOSFET – Gate cap – Junction cap – Typical values for a 0.25 μ m process –Examp le • Simple CMOS inverter operation
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EECS 312 4 Dynamic Behavior of MOS Transistor D S G B C GD C GS C SB C DB C GB Most important caps (largest): C gb , C db C sb usually doesn’t matter for delay purposes as it doesn’t typically switch
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5 Input Capacitance Gate capacitance Between gate and channel Proportional to gate area W*L eff (not L) Voltage dependent
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This note was uploaded on 04/01/2008 for the course EECS 312 taught by Professor Maharbiz during the Fall '07 term at University of Michigan.

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lecture3 - MOSFET Capacitance SPICE EECS 312 MOSFET reading...

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