Version 4 SHEET 1 2500 2968 WIRE 1200 -512 64 -512 WIRE 800 -416 544 -416 WIRE 1088 -416 800 -416 WIRE 1344 -416 1088 -416 WIRE 544 -368 544 -416 WIRE 800 -368 800 -416 WIRE 544 -256 544 -288 WIRE 800 -256 800 -288 WIRE 1088 -256 1088 -416 WIRE 1344 -256 1344 -416 WIRE 640 -208 608 -208 WIRE 736 -208 640 -208 WIRE 1024 -208 992 -208 WIRE 64 -192 64 -512 WIRE 544 -128 544 -160 WIRE 640 -128 640 -208 WIRE 640 -128 544 -128 WIRE 544 -80 544 -128 WIRE 800 -80 800 -160 WIRE 1088 -80 1088 -160 WIRE 64 0 64 -112 WIRE 144 0 64 0 WIRE 160 0 144 0 WIRE 256 0 224 0 WIRE 1088 32 1088 0 WIRE 1200 32 1200 -512 WIRE 1200 32 1088 32 WIRE 1216 32 1200 32 WIRE 800 48 800 0 WIRE 992 48 992 -208 WIRE 992 48 800 48 WIRE 1344 48 1344 -176 WIRE 1440 48 1344 48 WIRE 144 64 144 0 WIRE 160 64 144 64 WIRE 256 64 256 0 WIRE 256 64 224 64 WIRE 800 80 800 48 WIRE 1088 80 1088 32 WIRE 1440 80 1440 48 WIRE 144 112 -304 112 WIRE 464 112 352 112 WIRE -304 128 -304 112 WIRE 352 128 352 112 WIRE 464 128 464 112 WIRE 144 144 144 112 WIRE -80 160 -80 80 WIRE -80 160 -144 160 WIRE -64 160 -80 160 WIRE 64 160 64 0 WIRE 64 160 16 160 WIRE 112 160 64 160 WIRE 256 176 256 64 WIRE 256 176 176 176 WIRE 288 176 256 176 WIRE 112 192 64 192 WIRE 1200 192 1200 32 WIRE 1248 192 1200 192 WIRE 1344 192 1344 48 WIRE 1344 192 1312 192 WIRE 800 208 800 160 WIRE 1088 208 1088 160 WIRE -304 240 -304 208 WIRE -304 240 -384 240 WIRE -32 240 -144 240 WIRE 64 240 64 192 WIRE 64 240 -32 240 WIRE -384 256 -384 240 WIRE -304 256 -304 240 WIRE 352 256 352 224 WIRE 624 256 352 256 WIRE 736 256 704 256 WIRE 992 256 992 48 WIRE 1024 256 992 256 WIRE -32 272 -32 240 WIRE 352 272 352 256 WIRE 1344 272 1344 192 WIRE -304 352 -304 336 WIRE 144 352 144 208 WIRE 144 352 -304 352 WIRE 352 384 352 352 WIRE 544 384 544 0 WIRE 544 384 352 384 WIRE 800 384 800 304 WIRE 800 384 544 384 WIRE 1088 384 1088 304 WIRE 1088 384 800 384 WIRE 1344 384 1344 352 WIRE 1344 384 1088 384 FLAG -32 272 0 FLAG 464 128 0 FLAG 1440 80 0 FLAG -384 256 0 FLAG -80 80 IN IOPIN -80 80 Out FLAG 1216 32 OUT IOPIN 1216 32 Out SYMBOL res 32 144 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res 48 -208 R0 SYMATTR InstName R2 SYMATTR Value 20k SYMBOL voltage -144 144 R0 WINDOW 123 24 132 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V1 SYMATTR Value PULSE(-2 2 0 1n 1n 5m 10m) SYMBOL pnp 288 224 M180 SYMATTR InstName Q1 SYMATTR Value MJE350 SYMBOL res 336 256 R0 SYMATTR InstName R3 SYMATTR Value 39k SYMBOL npn 736 208 R0 SYMATTR InstName Q2 SYMATTR Value MJE340 SYMBOL res 720 240 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL res 784 64 R0 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL res 784 -96 R0 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL res 528 -96 R0 SYMATTR InstName R7 SYMATTR Value 1meg SYMBOL pnp 608 -160 R180 SYMATTR InstName Q3 SYMATTR Value MJE350 SYMBOL pnp 736 -160 M180 SYMATTR InstName Q4 SYMATTR Value MJE350 SYMBOL pnp 1024 304 M180 SYMATTR InstName Q5 SYMATTR Value MJE350 SYMBOL npn 1024 -256 R0 SYMATTR InstName Q6 SYMATTR Value MJE340 SYMBOL voltage 1344 -272 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 44 Left 0 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V2 SYMATTR Value 125 SYMBOL voltage 1344 256 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V3 SYMATTR Value 125 SYMBOL voltage -304 112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V4 SYMATTR Value 12 SYMBOL voltage -304 240 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V5 SYMATTR Value 12 SYMBOL res 528 -384 R0 SYMATTR InstName R8 SYMATTR Value 1 SYMBOL res 784 -384 R0 SYMATTR InstName R9 SYMATTR Value 1 SYMBOL res 1072 -96 R0 SYMATTR InstName R10 SYMATTR Value 1 SYMBOL res 1072 64 R0 SYMATTR InstName R11 SYMATTR Value 1 SYMBOL cap 1312 176 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 470n SYMBOL Opamps\\opamp2 144 112 R0 SYMATTR InstName U1 SYMATTR Value LF411 SYMATTR SpiceModel LF411 SYMBOL diode 160 80 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 224 -16 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT -176 872 Left 0 !.tran 0 50m 0 TEXT 1568 -464 Left 0 !*//////////////////////////////////////////////////////////////////////\n* (C) National Semiconductor, Inc.\n* Models developed and under copyright by:\n* National Semiconductor, Inc. \n \n*/////////////////////////////////////////////////////////////////////\n* Legal Notice: This material is intended for free software support.\n* The file may be copied, and distributed; however, reselling the \n* material is illegal\n \n*////////////////////////////////////////////////////////////////////\n* For ordering or technical information on these models, contact:\n* National Semiconductor's Customer Response Center\n* 7:00 A.M.--7:00 P.M. U.S. Central Time\n* (800) 272-9959\n* For Applications support, contact the Internet address:\n* amps-apps@galaxy.nsc.com\n \n* ///////////////////////////////////////////////////////////////////\n* User Notes:\n*\n* 1. Input resistance (Rin) for these JFET op amps is 1TOhm. Rin is\n* modeled by assuming the option GMIN=1TOhm. If a different (non-\n* default) GMIN value is needed, users may recalculate as follows:\n* Rin=(R1||GMIN+R2||GMIN), where R1=R2,\n* to maintain a consistent Rin model.\n \n* ///////////////////////////////////////////////////////////////////\n*//////////////////////////////////////////////////////////\n*LF411 LOW OFFSET, LOW DRIFT JFET INPUT OP-AMP MACRO-MODEL\n*//////////////////////////////////////////////////////////\n*\n* connections: non-inverting input\n* | inverting input\n* | | positive power supply\n* | | | negative power supply\n* | | | | output\n* | | | | |\n* | | | | |\n.SUBCKT LF411 1 2 99 50 28\n*\n*Features:\n*Fast settling time (.01%) = 2uS\n*High bandwidth = 3MHz\n*High slew rate = 10V/uS\n*Low offset voltage = .5mV\n*Low supply current = 1.8mA\n*\n****************INPUT STAGE************** \n*\nIOS 2 1 25.0P\n*^Input offset current\nCI1 1 0 3P\nCI2 2 0 3P\nR1 1 3 1E12\nR2 3 2 1E12\nI1 99 4 1.0M\nJ1 5 2 4 JX\nJ2 6 7 4 JX\nR3 5 50 650\nR4 6 50 650\n*Fp2=28 MHZ\nC4 5 6 4.372P \n*\n***********COMMON MODE EFFECT***********\n*\nI2 99 50 800UA\n*^Quiescent supply current\nEOS 7 1 POLY(1) 16 49 .8E-3 1\n*Input offset voltage.^\nR8 99 49 80K\nR9 49 50 80K\n*\n*********OUTPUT VOLTAGE LIMITING********\nV2 99 8 2.13\nD1 9 8 DX\nD2 10 9 DX\nV3 10 50 2.13\n*\n**************SECOND STAGE**************\n*\nEH 99 98 99 49 1\nG1 98 9 5 6 20E-3\nR5 98 9 10MEG\nVA3 9 11 0\n*Fp1=18 HZ\nC3 98 11 857.516P\n*\n***************POLE STAGE***************\n*\n*Fp=30 MHz\nG3 98 15 9 49 1E-6\nR12 98 15 1MEG\nC5 98 15 5.305E-15\n*\n*********COMMON-MODE ZERO STAGE*********\n*\nG4 98 16 3 49 1E-8\nL2 98 17 144.7M\nR13 17 16 1K\n*\n**************OUTPUT STAGE**************\n*\nF6 99 50 VA7 1\nF5 99 23 VA8 1\nD5 21 23 DX\nVA7 99 21 0\nD6 23 99 DX\nE1 99 26 99 15 1\nVA8 26 27 0\nR16 27 28 50\nV5 28 25 0.646V\nD4 25 15 DX\nV4 24 28 0.646V\nD3 15 24 DX\n*\n***************MODELS USED**************\n*\n.MODEL DX D(IS=1E-15)\n.MODEL JX PJF(BETA=1.183E-3 VTO=-.65 IS=50E-12)\n*\n.ENDS\n*$