Version 4
SHEET 1 1100 756
WIRE -112 144 -192 144
WIRE 48 144 -32 144
WIRE 464 144 272 144
WIRE -192 160 -192 144
WIRE 464 160 464 144
WIRE 48 208 32 208
WIRE -192 256 -192 240
WIRE 464 256 464 240
WIRE 48 272 -80 272
WIRE 384 272 272 272
WIRE -80 288 -80 272
WIRE 384 288 384 272
WIRE -80 384 -80 368
WIRE 384 384 384 368
FLAG 32 208 0
FLAG 384 384 0
FLAG 464 256 0
FLAG -80 384 0
FLAG -192 256 0
SYMBOL LTC1728-1.8 160 240 R0
SYMATTR InstName U1
SYMBOL voltage -80 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PWL(0 1.05 7 1.05 8 .95 9 1.05)
SYMBOL voltage 384 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PWL(0 1.8 4 1.8 5 1.5 6 1.8)
SYMBOL voltage 464 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PWL(0 3 1 3 2 2.5 3 3)
SYMBOL voltage -192 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 5
SYMBOL res -16 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10K
TEXT 448 440 Left 2 !.tran 10