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Lecture 2

# 2supply fall1 end fo4optsp davidharrishmcedu

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Unformatted text preview: df)/2' * average propagation delay .measure trise * rise time + TRIG v(d) VAL='0.2*SUPPLY' RISE=1 + TARG v(d) VAL='0.8*SUPPLY' RISE=1 .measure tfall * fall time + TRIG v(d) VAL='0.8*SUPPLY' FALL=1 + TARG v(d) VAL='0.2*SUPPLY' FALL=1 .end • – • – – – • – – * * * * fo4opt.sp [email protected] 2/2/03 Modified C. Talarico 9/30/11 P/N ratio for equal rise/fall delay (typ) •************** Parameters and models •.option accurate .param SUPPLY=1.8 .param H=4 .option scale=90n nomod brief .include '../mosistsmc180/mosistsmc180.sp’ *************** Subcircuits .global vdd gnd .subckt inv a y N=4 P=8 M1 y a gnd gnd NMOS W='N' L=2 + AS='N*5' PS='2*N+10' AD='N*5' PD='2*N+10' M2 y a vdd vdd PMOS W='P' L=2 + AS='P*5' PS='2*P+10' AD='P*5' PD='2*P+10' .ends *************** Simulation netlist Vdd vdd gnd 'SUPPLY' Vin a gnd PULSE 0 'SUPPLY' 0ps 20ps 20ps 220ps 480ps X1 a b inv P='P1' * shape input waveform X2 b c inv P='P1' M=4 * reshape input waveform X3 c d inv P='P1' M=16 * device under test X4 d e inv P='P1' M=64 * load X5 e f inv P='P1' M=256 * lo...
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