Version 4 SHEET 1 1204 2100 WIRE -304 -96 -336 -96 WIRE -16 -96 -96 -96 WIRE 16 -96 -16 -96 WIRE 128 -96 96 -96 WIRE 816 -96 128 -96 WIRE 944 -96 816 -96 WIRE 816 -64 816 -96 WIRE 944 -64 944 -96 WIRE -16 -48 -16 -96 WIRE 128 -48 128 -96 WIRE 512 -16 448 -16 WIRE 640 -16 592 -16 WIRE -336 64 -336 -96 WIRE 816 64 816 16 WIRE 944 64 944 16 WIRE 512 96 512 64 WIRE 128 112 128 32 WIRE 448 112 448 -16 WIRE 448 112 128 112 WIRE 480 112 448 112 WIRE 640 128 640 -16 WIRE 640 128 544 128 WIRE 672 128 640 128 WIRE -16 144 -16 32 WIRE 480 144 -16 144 WIRE 512 192 512 160 WIRE -16 208 -16 144 WIRE 128 208 128 112 WIRE -336 320 -336 144 WIRE -16 320 -16 288 WIRE 128 320 128 288 WIRE -32 480 -112 480 WIRE 0 480 -32 480 WIRE 112 480 80 480 WIRE 832 480 112 480 WIRE 960 480 832 480 WIRE 832 512 832 480 WIRE 960 512 960 480 WIRE -32 528 -32 480 WIRE 112 528 112 480 WIRE 496 560 432 560 WIRE 624 560 576 560 WIRE 832 640 832 592 WIRE 960 640 960 592 WIRE 112 656 112 608 WIRE 432 656 432 560 WIRE 432 656 112 656 WIRE 496 672 496 640 WIRE 432 688 432 656 WIRE 464 688 432 688 WIRE 624 704 624 560 WIRE 624 704 528 704 WIRE 656 704 624 704 WIRE -32 720 -32 608 WIRE 288 720 -32 720 WIRE 464 720 288 720 WIRE -32 784 -32 720 WIRE 112 784 112 656 WIRE 496 784 496 736 WIRE 288 800 288 720 WIRE -32 896 -32 864 WIRE 112 896 112 864 WIRE 288 896 288 880 WIRE 496 896 496 864 WIRE -32 1056 -112 1056 WIRE 0 1056 -32 1056 WIRE 112 1056 80 1056 WIRE 288 1056 112 1056 WIRE 832 1056 288 1056 WIRE 960 1056 832 1056 WIRE 288 1088 288 1056 WIRE 832 1088 832 1056 WIRE 960 1088 960 1056 WIRE -32 1104 -32 1056 WIRE 112 1104 112 1056 WIRE 496 1136 432 1136 WIRE 624 1136 576 1136 WIRE 832 1216 832 1168 WIRE 960 1216 960 1168 WIRE 112 1232 112 1184 WIRE 432 1232 432 1136 WIRE 432 1232 112 1232 WIRE 496 1248 496 1216 WIRE 432 1264 432 1232 WIRE 464 1264 432 1264 WIRE 624 1280 624 1136 WIRE 624 1280 528 1280 WIRE 656 1280 624 1280 WIRE -32 1296 -32 1184 WIRE 288 1296 288 1168 WIRE 288 1296 -32 1296 WIRE 464 1296 288 1296 WIRE -32 1360 -32 1296 WIRE 112 1360 112 1232 WIRE 496 1360 496 1312 WIRE 288 1376 288 1296 WIRE -32 1472 -32 1440 WIRE 112 1472 112 1440 WIRE 288 1472 288 1456 WIRE -32 1632 -112 1632 WIRE 0 1632 -32 1632 WIRE 176 1632 80 1632 WIRE 832 1632 176 1632 WIRE 960 1632 832 1632 WIRE 832 1664 832 1632 WIRE 960 1664 960 1632 WIRE -32 1744 -32 1632 WIRE 0 1744 -32 1744 WIRE 128 1744 80 1744 WIRE 240 1744 128 1744 WIRE 672 1744 336 1744 WIRE 832 1792 832 1744 WIRE 960 1792 960 1744 WIRE 288 1824 288 1808 WIRE 464 1824 288 1824 WIRE 576 1824 544 1824 WIRE 672 1904 672 1744 WIRE 800 1904 672 1904 WIRE 496 1936 496 1904 WIRE 672 1936 672 1904 WIRE 128 1952 128 1744 WIRE 464 1952 128 1952 WIRE 576 1968 576 1824 WIRE 576 1968 528 1968 WIRE 176 1984 176 1632 WIRE 464 1984 176 1984 WIRE 496 2048 496 2000 WIRE 672 2048 672 2016 FLAG 128 320 0 FLAG -336 320 0 FLAG 816 64 0 FLAG 512 192 0 FLAG -16 320 0 FLAG 944 64 0 FLAG 512 64 VB FLAG -304 -96 VB IOPIN -304 -96 Out FLAG 112 896 0 FLAG 832 640 0 FLAG 496 896 0 FLAG -32 896 0 FLAG 960 640 0 FLAG 496 640 VB FLAG -112 480 VB IOPIN -112 480 In FLAG 288 896 0 FLAG 672 128 C1 IOPIN 672 128 Out FLAG 656 704 C2 IOPIN 656 704 Out FLAG 112 1472 0 FLAG 832 1216 0 FLAG -32 1472 0 FLAG 960 1216 0 FLAG 496 1216 VB FLAG 288 1472 0 FLAG 656 1280 C3 IOPIN 656 1280 Out FLAG 496 1360 0 FLAG 832 1792 0 FLAG 960 1792 0 FLAG 496 1904 VB FLAG 800 1904 C4 IOPIN 800 1904 Out FLAG 496 2048 0 FLAG 672 2048 0 FLAG -96 -96 VB IOPIN -96 -96 In FLAG -112 1056 VB IOPIN -112 1056 In FLAG -112 1632 VB IOPIN -112 1632 In SYMBOL Opamps\\LT1001A 512 64 R0 SYMATTR InstName U1 SYMBOL Misc\\battery -336 48 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 132 Left 0 SYMATTR SpiceLine Rser=0 SYMATTR InstName V1 SYMATTR Value 9 SYMBOL res 112 -112 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R3 SYMATTR Value .1 SYMBOL res 0 48 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL res 112 48 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R8 SYMATTR Value 10K SYMBOL res 112 304 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R9 SYMATTR Value 10K SYMBOL res 800 -80 R0 SYMATTR InstName R6 SYMATTR Value 1meg SYMBOL res 608 -32 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 100K SYMBOL res 0 192 M0 SYMATTR InstName R7 SYMATTR Value 10K SYMBOL current 944 -64 R0 WINDOW 3 24 144 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 116 Left 0 SYMATTR Value PWL(0 0 100m 1) SYMATTR SpiceLine load SYMATTR InstName I1 SYMBOL Opamps\\LT1001A 496 640 R0 SYMATTR InstName U2 SYMBOL res 96 464 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value .1 SYMBOL res -16 624 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R2 SYMATTR Value 10K SYMBOL res 96 624 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R11 SYMATTR Value 10K SYMBOL res 96 880 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R12 SYMATTR Value 10K SYMBOL res 816 496 R0 SYMATTR InstName R13 SYMATTR Value 1meg SYMBOL res 592 544 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R14 SYMATTR Value 100K SYMBOL res -16 768 M0 SYMATTR InstName R15 SYMATTR Value 10K SYMBOL current 960 512 R0 WINDOW 3 24 144 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 116 Left 0 SYMATTR Value PWL(0 0 100m 1) SYMATTR SpiceLine load SYMATTR InstName I2 SYMBOL voltage 496 768 R0 SYMATTR InstName V4 SYMATTR Value -9 SYMBOL res 272 784 R0 SYMATTR InstName R16 SYMATTR Value 100K SYMBOL res 96 1040 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R10 SYMATTR Value .1 SYMBOL res -16 1200 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R17 SYMATTR Value 10K SYMBOL res 96 1200 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R18 SYMATTR Value 10K SYMBOL res 96 1456 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R19 SYMATTR Value 10K SYMBOL res 816 1072 R0 SYMATTR InstName R20 SYMATTR Value 1meg SYMBOL res 592 1120 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R21 SYMATTR Value 100K SYMBOL res -16 1344 M0 SYMATTR InstName R22 SYMATTR Value 10K SYMBOL current 960 1088 R0 WINDOW 3 24 144 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 116 Left 0 SYMATTR Value PWL(0 0 100m 1) SYMATTR SpiceLine load SYMATTR InstName I3 SYMBOL res 272 1360 R0 SYMATTR InstName R23 SYMATTR Value 100K SYMBOL Opamps\\LT1218 496 1280 R0 SYMATTR InstName U4 SYMBOL res 272 1072 R0 SYMATTR InstName R24 SYMATTR Value 20Meg SYMBOL res 96 1616 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R25 SYMATTR Value .1 SYMBOL res 816 1648 R0 SYMATTR InstName R29 SYMATTR Value 1meg SYMBOL res 96 1728 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R30 SYMATTR Value 100 SYMBOL current 960 1664 R0 WINDOW 3 24 144 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 116 Left 0 SYMATTR Value PWL(0 0 100m 1) SYMATTR SpiceLine load SYMATTR InstName I4 SYMBOL Opamps\\LT1218 496 1968 R0 SYMATTR InstName U3 SYMBOL res 656 1920 R0 SYMATTR InstName R26 SYMATTR Value 1k SYMBOL pnp 336 1808 M270 WINDOW 0 70 54 VLeft 0 WINDOW 3 30 -8 VLeft 0 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL res 448 1840 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R27 SYMATTR Value 1k TEXT -248 -312 Left 0 !.tran .1 TEXT -248 -216 Left 0 !.step V1 list 9 10 TEXT 648 184 Left 0 ;VB/2 @ ILOAD=0 TEXT 632 744 Left 0 ;0V @ ILOAD=0 TEXT 128 440 Left 0 ;2. Very good common mode suppression, precision resistors required TEXT 120 -136 Left 0 ;1. Very poor common mode suppression, precision resistors required TEXT 632 1320 Left 0 ;28mV offset @ ILOAD=0 TEXT 128 1016 Left 0 ;3. Very good common mode suppression, precision resistors required TEXT 744 1944 Left 0 ;0V @ ILOAD=0 TEXT 128 1592 Left 0 ;4. Excellent common mode suppression, no precision resistors required TEXT 88 -384 Left 0 ;Current Sense Circuits 1V/1A\n \n1. Single Supply, Non-Rail-Rail-Opamp\n2. Dual Supply, Non-Rail-Rail-Opamp\n3. Single Supply, Rail-Rail-Opamp\n4. Single Supply, Rail-Rail-Opamp + PNP TEXT 584 -408 Left 0 ;Circuits 1, 2 and 3 require very precision resistors\nResistor tolerance have to be 0.01% to 0.1% \ndepending on the required current sense\naccuracy of 1% or 10%.\n \nResistor tolerance in circuit-4 can be 1%\nif 2% accuracy is required. TEXT -248 -280 Left 0 !.options plotwinsize=0 TEXT -152 1856 Left 0 ;* * * * * 5 star circuit RECTANGLE Normal 1184 352 -192 -176 RECTANGLE Normal 1184 928 -192 400 RECTANGLE Normal 1184 1504 -192 976 RECTANGLE Normal 1184 2080 -192 1552 RECTANGLE Normal 1200 2096 -208 1536