CMOS RING OSCILLATOR - 2UM DEVICES VDD 1 0 5.0V VSS 2 0 0.0V X1 1 2 3 4 INV X2 1 2 4 5 INV X3 1 2 5 6 INV X4 1 2 6 7 INV X5 1 2 7 8 INV X6 1 2 8 9 INV X7 1 2 9 3 INV .IC V(3)=0.0V V(4)=2.5V V(5)=5.0V V(6)=0.0V + V(7)=5.0V V(8)=0.0V V(9)=5.0V .SUBCKT INV 1 2 3 4 * VDD VSS VIN VOUT M1 14 13 15 16 M_PMOS W=6.0U M2 24 23 25 26 M_NMOS W=3.0U VGP 3 13 0.0V VDP 4 14 0.0V VSP 1 15 0.0V VBP 1 16 0.0V VGN 3 23 0.0V VDN 4 24 0.0V VSN 2 25 0.0V VBN 2 26 0.0V .ENDS INV .MODEL M_NMOS NUMOS + X.MESH L=0.0 N=1 + X.MESH L=0.6 N=4 + X.MESH L=0.7 N=5 + X.MESH L=1.0 N=7 + X.MESH L=1.2 N=11 + X.MESH L=3.2 N=21 + X.MESH L=3.4 N=25 + X.MESH L=3.7 N=27 + X.MESH L=3.8 N=28 + X.MESH L=4.4 N=31 + + Y.MESH L=-.05 N=1 + Y.MESH L=0.0 N=5 + Y.MESH L=.05 N=9 + Y.MESH L=0.3 N=14 + Y.MESH L=2.0 N=19 + + REGION NUM=1 MATERIAL=1 Y.L=0.0 + MATERIAL NUM=1 SILICON + MOBILITY MATERIAL=1 CONCMOD=SG FIELDMOD=SG + + REGION NUM=2 MATERIAL=2 Y.H=0.0 X.L=0.7 X.H=3.7 + MATERIAL NUM=2 OXIDE + + ELEC NUM=1 X.L=3.8 X.H=4.4 Y.L=0.0 Y.H=0.0 + ELEC NUM=2 X.L=0.7 X.H=3.7 IY.L=1 IY.H=1 + ELEC NUM=3 X.L=0.0 X.H=0.6 Y.L=0.0 Y.H=0.0 + ELEC NUM=4 X.L=0.0 X.H=4.4 Y.L=2.0 Y.H=2.0 + + DOPING UNIF P.TYPE CONC=2.5E16 X.L=0.0 X.H=4.4 Y.L=0.0 Y.H=2.0 + DOPING UNIF P.TYPE CONC=1E16 X.L=0.0 X.H=4.4 Y.L=0.0 Y.H=0.05 + DOPING UNIF N.TYPE CONC=1E20 X.L=0.0 X.H=1.1 Y.L=0.0 Y.H=0.2 + DOPING UNIF N.TYPE CONC=1E20 X.L=3.3 X.H=4.4 Y.L=0.0 Y.H=0.2 + + MODELS CONCMOB FIELDMOB BGN SRH CONCTAU + METHOD AC=DIRECT ONEC + OUTPUT ^ALL.DEBUG .MODEL M_PMOS NUMOS + X.MESH L=0.0 N=1 + X.MESH L=0.6 N=4 + X.MESH L=0.7 N=5 + X.MESH L=1.0 N=7 + X.MESH L=1.2 N=11 + X.MESH L=3.2 N=21 + X.MESH L=3.4 N=25 + X.MESH L=3.7 N=27 + X.MESH L=3.8 N=28 + X.MESH L=4.4 N=31 + + Y.MESH L=-.05 N=1 + Y.MESH L=0.0 N=5 + Y.MESH L=.05 N=9 + Y.MESH L=0.3 N=14 + Y.MESH L=2.0 N=19 + + REGION NUM=1 MATERIAL=1 Y.L=0.0 + MATERIAL NUM=1 SILICON + MOBILITY MATERIAL=1 CONCMOD=SG FIELDMOD=SG + + REGION NUM=2 MATERIAL=2 Y.H=0.0 X.L=0.7 X.H=3.7 + MATERIAL NUM=2 OXIDE + + ELEC NUM=1 X.L=3.8 X.H=4.4 Y.L=0.0 Y.H=0.0 + ELEC NUM=2 X.L=0.7 X.H=3.7 IY.L=1 IY.H=1 + ELEC NUM=3 X.L=0.0 X.H=0.6 Y.L=0.0 Y.H=0.0 + ELEC NUM=4 X.L=0.0 X.H=4.4 Y.L=2.0 Y.H=2.0 + + DOPING UNIF N.TYPE CONC=1E16 X.L=0.0 X.H=4.4 Y.L=0.0 Y.H=2.0 + DOPING UNIF P.TYPE CONC=3E16 X.L=0.0 X.H=4.4 Y.L=0.0 Y.H=0.05 + DOPING UNIF P.TYPE CONC=1E20 X.L=0.0 X.H=1.1 Y.L=0.0 Y.H=0.2 + DOPING UNIF P.TYPE CONC=1E20 X.L=3.3 X.H=4.4 Y.L=0.0 Y.H=0.2 + + MODELS CONCMOB FIELDMOB BGN SRH CONCTAU + METHOD AC=DIRECT ONEC + OUTPUT ^ALL.DEBUG .TRAN 0.1NS 5.0NS .PRINT V(4) .OPTIONS ACCT BYPASS=1 METHOD=GEAR .END
