Version 4
SHEET 1 1216 680
WIRE 176 -80 -48 -80
WIRE 368 -80 256 -80
WIRE 560 -80 368 -80
WIRE -48 16 -48 -80
WIRE -32 16 -48 16
WIRE 144 16 112 16
WIRE 416 32 416 16
WIRE -160 48 -288 48
WIRE -160 64 -160 48
WIRE 368 80 368 -80
WIRE 384 80 368 80
WIRE 48 112 48 96
WIRE 560 112 560 -80
WIRE 560 112 528 112
WIRE -48 128 -48 16
WIRE 16 128 -48 128
WIRE 112 144 112 16
WIRE 112 144 80 144
WIRE 144 144 112 144
WIRE 240 144 224 144
WIRE 272 144 240 144
WIRE 368 144 352 144
WIRE 384 144 368 144
WIRE -160 160 -160 144
WIRE 16 160 -160 160
WIRE 48 208 48 176
WIRE 368 224 368 144
WIRE 368 224 304 224
WIRE 304 240 304 224
WIRE 416 240 416 192
WIRE -160 288 -160 160
WIRE 304 320 304 304
WIRE 368 320 368 224
WIRE 496 320 368 320
WIRE 240 336 240 144
WIRE 240 336 144 336
WIRE 368 336 368 320
WIRE 496 336 496 320
WIRE 240 352 240 336
WIRE -384 368 -384 288
WIRE -288 368 -288 48
WIRE 144 368 144 336
WIRE 368 448 368 416
WIRE 496 448 496 400
WIRE 496 448 368 448
WIRE -384 480 -384 448
WIRE -288 480 -288 448
WIRE -288 480 -384 480
WIRE -160 480 -160 368
WIRE -160 480 -288 480
WIRE -48 480 -160 480
WIRE 144 480 144 432
WIRE 144 480 -48 480
WIRE 240 480 240 432
WIRE 240 480 144 480
WIRE 368 496 368 448
WIRE -48 528 -48 480
WIRE 240 592 240 480
WIRE 368 592 368 576
WIRE 368 592 240 592
FLAG -48 528 0
FLAG 144 16 Out
IOPIN 144 16 Out
FLAG -288 48 V+
FLAG 416 16 V+
FLAG -384 288 V-
FLAG 416 240 V-
FLAG 48 96 V+
FLAG 48 208 V-
FLAG 304 320 0
SYMBOL cap 48 32 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 6n
SYMBOL res 128 160 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 256 160 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10Meg
SYMBOL res 224 336 R0
WINDOW 3 32 85 Left 2
SYMATTR Value 113k
SYMATTR InstName R3
SYMBOL res 272 -96 R90
WINDOW 0 -13 55 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL res 352 320 R0
SYMATTR InstName R5
SYMATTR Value {Rsens}
SYMBOL voltage 368 480 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0.5 1 100m 100n 100n 100m 200m 5)
SYMBOL voltage -288 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 2.5
SYMBOL res -176 48 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res -176 272 R0
SYMATTR InstName R8
SYMATTR Value 1
SYMBOL cap 480 336 R0
SYMATTR InstName C2
SYMATTR Value 10p
SYMBOL Opamps\\LTC6268 416 112 R0
SYMATTR InstName U3
SYMBOL voltage -384 464 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 24 -12 Left 2
SYMATTR InstName V3
SYMATTR Value 2.5
SYMATTR SpiceLine Rser=0.1
SYMBOL Opamps\\LTC6246 48 144 R0
WINDOW 3 -112 54 Left 2
SYMATTR InstName U1
SYMBOL cap 128 368 R0
SYMATTR InstName C3
SYMATTR Value 10p
SYMBOL res 64 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL cap 288 240 R0
SYMATTR InstName C4
SYMATTR Value 100p
TEXT -368 -224 Left 2 !.lib opamp.sub
TEXT 608 224 Left 2 !.STEP PARAM Rsens 100Meg 1000Meg 200Meg
TEXT -368 576 Left 2 !.tran 3 startup