CMOS Capacitance and Circuit Delay
Copyright 2001, Regents of University of CaliforniaEECS 42 Intro. electronics for CS Fall 2001Lecture 24: 11/28/01 NeureutherVersion Date 12/01/01CMOS Capacitance and Circuit DelayA) CMOS Structure and CapacitanceB) Gate and Source Drain Capacitance ModelC) Cascade Inverter DelayD) Capacitance from Logic FunctionE) Fan-Out and Logic DelayReading: Schwarz and Oldham, pp. 518-526, and lectures 16-19. Lecture 24Copyright 2001, Regents of University of CaliforniaEECS 42 Intro. electronics for CS Fall 2001Lecture 24: 11/28/01 NeureutherVersion Date 12/01/01Dynamic Performance: Add CapacitancesCapacitance CGis between gate and the underlying channel, which is connected to the source, CGS= CG and hence is modeled as Capacitance to LWCC= =LWArea of GateWCLWCCperimeterjunctionSD + =min4Capacitance CSDhas a bottom and out-side perimeter between the source or drain and the underlying substrate which is connected to ground.
EECS 42 Intro. electronics for CS Fall 2001 Lecture 24: 11/28/01 A.R. Neureuther Version Date 12/01/01 Dynamic Performance: Add Capacitances Capacitance CG is between gate and the underlying channel, which is connected to the source, CGS = CG and hence is modeled as capacitance to a.c. ground. source drain gate VS V VD ox G ox G ox t ε WL C =C ...
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