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Lecture11-MOS Cap Delay

EE1411 EECS1411 Lecture #11EE141EE141--Fall 2010 Fall 2010 Digital Integrated Digital Integrated CircuitsCircuitsLecture 11 Lecture 11 MOS capacitance MOS capacitance and Delayand DelayEE1412 EECS1412 Lecture #11 AnnouncementsAnnouncements No lab Fri., Mon. Labs restart next week Midterm #1 Thurs. Oct. 7th, 6:30-8:00pm Exam is open notes, book, calculators, #11 Class MaterialClass Material Last lecture Using the MOS model: Inverter VTC Today s lecture MOS capacitance Using the MOS Model: Delay Reading ( , )EE1414 EECS1414 Lecture #11 MOS CapacitanceMOS CapacitanceEE1415 EECS1415 Lecture #11 CGDCGSCSBCDBCGBMOS CapacitancesMOS Capacitances= CGCS+ CGSO= CGCD+ CGDO= CGCB= CdiffGSDB= CdiffEE1416 EECS1416 Lecture #11 Gate CapacitanceGate capacitance capacitance (per area) from gate across the oxide is W L Cox, where Cox= ox/toxEE1417 EECS1417 Lecture #11 Gate CapacitanceGate capacitance Distribution between terminals is complex capacitance is really distributed Useful models lump it to the terminals Several operating regions: Way off, off, trans

Capacitance [arbitrary units] N+ junction area N+ junction perimeter P+ junction area P+ junction perimeter Junction caps are nonlinear –C J is a function of junction bias EE141 18 EECS141 Lecture #11 18 Linearizing the Junction Capacitance Replace non-linear capacitance by large-signal equivalent linear capacitance

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