Version 4
SHEET 1 940 680
WIRE 544 -16 -576 -16
WIRE -576 0 -576 -16
WIRE 336 48 -304 48
WIRE -304 64 -304 48
WIRE 336 80 336 48
WIRE -576 96 -576 80
WIRE 544 128 544 -16
WIRE -304 160 -304 144
WIRE 0 192 -752 192
WIRE 336 192 336 160
WIRE 336 192 288 192
WIRE 384 192 336 192
WIRE 480 192 464 192
WIRE -752 208 -752 192
WIRE 0 240 -512 240
WIRE 544 240 544 208
WIRE 544 240 288 240
WIRE 592 240 544 240
WIRE 688 240 672 240
WIRE -512 256 -512 240
WIRE 0 288 -256 288
WIRE -752 304 -752 288
WIRE -256 304 -256 288
WIRE 0 336 -16 336
WIRE 352 336 288 336
WIRE 512 336 432 336
WIRE -512 352 -512 336
WIRE 512 352 512 336
WIRE -16 384 -16 336
WIRE 144 384 144 368
WIRE -256 400 -256 384
WIRE 512 448 512 432
WIRE -16 480 -16 464
FLAG 144 384 0
FLAG -752 304 0
FLAG -304 160 0
FLAG 512 448 0
FLAG 480 192 0
FLAG -512 352 0
FLAG -256 400 0
FLAG -16 480 0
FLAG 688 240 0
FLAG -576 96 0
SYMBOL voltage -752 192 R0
WINDOW 0 23 24 Left 2
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1m 5)
SYMBOL voltage -304 48 R0
WINDOW 3 27 89 Left 2
SYMATTR Value PWL(0 0 1m 12)
SYMATTR InstName V2
SYMBOL res 448 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100K
SYMBOL voltage 512 336 R0
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL res 320 64 R0
SYMATTR InstName R2
SYMATTR Value 2.15Meg
SYMBOL res 368 208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 100K
SYMBOL LTC2908-A1 144 256 R0
SYMATTR InstName U1
SYMBOL voltage -512 240 R0
WINDOW 0 23 24 Left 2
SYMATTR InstName V4
SYMATTR Value PWL(0 0 1m 3.3)
SYMBOL voltage -256 288 R0
WINDOW 0 28 31 Left 2
SYMATTR InstName V5
SYMATTR Value PWL(0 0 1m 2.5)
SYMBOL voltage -16 368 R0
WINDOW 0 28 31 Left 2
WINDOW 3 24 99 Left 2
SYMATTR InstName V6
SYMATTR Value PWL(0 0 1m 1.8)
SYMBOL res 528 112 R0
SYMATTR InstName R4
SYMATTR Value 86.6K
SYMBOL res 576 256 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL voltage -576 -16 R0
WINDOW 3 27 89 Left 2
SYMATTR Value PWL(0 0 1m 1)
SYMATTR InstName V7
TEXT 320 496 Left 2 !.tran 300m