Version 4
SHEET 1 976 680
WIRE 208 -176 80 -176
WIRE 432 -176 288 -176
WIRE -640 -128 -640 -176
WIRE -528 -128 -528 -176
WIRE -176 -80 -176 -112
WIRE -176 -80 -272 -80
WIRE -96 -80 -176 -80
WIRE -272 -64 -272 -80
WIRE -96 -64 -96 -80
WIRE 80 -32 80 -176
WIRE 128 -32 80 -32
WIRE 432 -32 432 -176
WIRE 432 -32 384 -32
WIRE -640 16 -640 -48
WIRE -528 16 -528 -48
WIRE 128 32 80 32
WIRE 480 32 480 -16
WIRE 480 32 384 32
WIRE -272 48 -272 16
WIRE -272 48 -304 48
WIRE -96 48 -96 16
WIRE -64 48 -96 48
WIRE -272 80 -272 48
WIRE -96 80 -96 48
WIRE 128 96 80 96
WIRE 480 96 384 96
WIRE 128 160 80 160
WIRE 480 160 384 160
WIRE -272 192 -272 160
WIRE -176 192 -272 192
WIRE -96 192 -96 160
WIRE -96 192 -176 192
WIRE -176 208 -176 192
WIRE -176 336 -176 288
FLAG -528 -176 V_ref
FLAG -640 -176 Vcc
IOPIN -640 -176 Out
FLAG -640 16 0
FLAG -528 16 0
FLAG -176 -192 Vcc
IOPIN -176 -192 Out
FLAG -176 336 0
FLAG -64 48 V+
FLAG -304 48 V-
FLAG 80 96 V+
FLAG 80 32 V-
FLAG 480 -16 Vcc
IOPIN 480 -16 Out
FLAG 480 160 V_ref
FLAG 80 160 0
FLAG 480 96 out
SYMBOL res -192 -208 R0
SYMATTR InstName R1
SYMATTR Value 330
SYMBOL res -288 -80 R0
SYMATTR InstName R2
SYMATTR Value 120
SYMBOL res -112 -80 R0
SYMATTR InstName R3
SYMATTR Value {-X}
SYMBOL res -288 64 R0
SYMATTR InstName R4
SYMATTR Value 120
SYMBOL res -112 64 R0
SYMATTR InstName R5
SYMATTR Value {X}
SYMBOL res -192 192 R0
SYMATTR InstName R6
SYMATTR Value 330
SYMBOL voltage -640 -144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL voltage -528 -144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 1.5
SYMBOL res 304 -192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 1000
SYMBOL OpAmps\\LT1920 256 64 R0
SYMATTR InstName U2
TEXT 216 280 Left 2 !*.step param X 110 130 1\n*.op
TEXT 576 112 Left 2 !.save V(out)\n.step param X 119 121 0.1\n.measure VoutAvg AVG V(out)\n.option plotwinsize=0 numdgt=15
TEXT 584 240 Left 2 !.tran 0 510m 500m