Version 4
SHEET 1 1780 3896
WIRE 256 -224 208 -224
WIRE 784 -208 784 -288
WIRE 960 -208 784 -208
WIRE 208 -160 208 -224
WIRE 784 -160 784 -208
WIRE 960 -144 960 -208
WIRE 208 -16 208 -80
WIRE 784 0 784 -80
WIRE 960 0 960 -80
WIRE 960 0 784 0
WIRE 784 112 784 0
WIRE 592 160 592 112
WIRE 560 176 448 176
WIRE 736 192 624 192
WIRE 560 208 -48 208
WIRE -48 272 -48 208
WIRE 592 288 592 224
WIRE 448 320 448 176
WIRE 784 320 784 208
WIRE 784 320 448 320
WIRE 784 336 784 320
WIRE -48 400 -48 352
WIRE 784 512 784 416
FLAG 256 -224 30V
FLAG 208 -16 0
FLAG 592 112 30V
FLAG 592 288 0
FLAG -48 400 0
FLAG 784 512 0
FLAG 784 -288 30V
SYMBOL voltage -48 256 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 2.5
SYMBOL voltage 208 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 30
SYMBOL res 768 320 R0
SYMATTR InstName R1
SYMATTR Value 1250
SYMBOL res 768 -176 R0
SYMATTR InstName RLAST
SYMATTR Value 2k
SYMBOL nmos 736 112 R0
SYMATTR InstName M1
SYMATTR Value LND150
SYMBOL Opamps\\opamp2 592 128 R0
SYMATTR InstName U1
SYMATTR Value UA741
SYMBOL cap 944 -144 R0
SYMATTR InstName C1
SYMBOL cap -2272 3824 R0
SYMATTR InstName C2
TEXT 1104 -336 Left 2 !*LND150 MODEL\n*\n.MODEL LND150 NMOS (LEVEL=3 RS=150.00 NSUB=5.0E13\n+DELTA=0.1 KAPPA=1.O TPG=1 CGDO=2.1716E-12\n+RD=40.0 VTO=-2.0 VMAX=1.0E8 ETA=0.1\n+NFS=6.6E10 TOX=1.0E-7 LD=1.698E-9 UO=862.425\n+XJ=6.4666E-7 THETA=1.0E-5 CGSO=5.09E-10 L=10.0E-6\n+W=600E-6)\n*.ENDS
TEXT 1104 -64 Left 2 !* 1 INVERTING INPUT\n* 2 NON-INVERTING INPUT\n* 3 OUTPUT\n* 4 POSITIVE POWER SUPPLY\n* 5 NEGATIVE POWER SUPPLY\n.SUBCKT UA741 2 1 4 5 3\n**********************************************************\n.MODEL MDTH D IS=1E-8 KF=8.68230E-16 CJO=10F\n* INPUT STAGE\nCIP 2 5 1.000000E-12\nCIN 1 5 1.000000E-12\nEIP 10 5 2 5 1\nEIN 16 5 1 5 1\nRIP 10 11 1.625000E+01\nRIN 15 16 1.625000E+01\nRIS 11 15 6.310822E+01\nDIP 11 12 MDTH 400E-12\nDIN 15 14 MDTH 400E-12\nVOFP 12 13 DC 0 \nVOFN 13 14 DC 0\nIPOL 13 5 1.600000E-05\nCPS 11 15 8.700201E-10\nDINN 17 13 MDTH 400E-12\nVIN 17 5 3.000000e+00\nDINR 15 18 MDTH 400E-12\nVIP 4 18 3.000000E+00\nFCP 4 5 VOFP 1.052500E+02\nFCN 5 4 VOFN 1.052500E+02\nFIBP 2 5 VOFP 1.250000E-03\nFIBN 5 1 VOFN 1.250000E-03\n* AMPLIFYING STAGE\nFIP 5 19 VOFP 3.750000E+02\nFIN 5 19 VOFN 3.750000E+02\nRG1 19 5 5.256811E+06\nRG2 19 4 5.256811E+06\nCC 19 29 1.200000E-08\nHZTP 30 29 VOFP 5.813295E+02\nHZTN  5 30 VOFN 5.813295E+02\nDOPM 19 22 MDTH 400E-12\nDONM 21 19 MDTH 400E-12\nHOPM 22 28 VOUT 4.400000E+03\nVIPM 28 4 1.100000E+02\nHONM 21 27 VOUT 4.400000E+03\nVINM 5 27 1.100000E+02\nEOUT 26 23 19 5 1\nVOUT 23 5 0\nROUT 26 3 90\nCOUT 3 5 1.000000E-12\nDOP 19 25 MDTH 400E-12\nVOP 4 25 2.25\nDON 24 19 MDTH 400E-12\nVON 24 5 2.25\n.ENDS UA741
TEXT -80 1416 Left 2 !.tran .1