Version 4
SHEET 1 1756 680
WIRE -304 -32 -304 -48
WIRE -192 -32 -192 -48
WIRE 336 32 336 16
WIRE -304 64 -304 48
WIRE -192 64 -192 48
WIRE 64 64 -64 64
WIRE -64 96 -64 64
WIRE -112 112 -176 112
WIRE 512 112 480 112
WIRE 528 112 512 112
WIRE 624 112 608 112
WIRE 64 128 0 128
WIRE 736 128 672 128
WIRE 672 144 672 128
WIRE -112 160 -128 160
WIRE 480 160 480 112
WIRE 480 160 432 160
WIRE 512 160 512 112
WIRE 624 160 512 160
WIRE -64 192 -64 176
WIRE -64 192 -96 192
WIRE 64 192 48 192
WIRE -64 208 -64 192
WIRE 624 208 512 208
WIRE -176 224 -176 112
WIRE -112 224 -176 224
WIRE 480 224 432 224
WIRE 672 240 672 224
WIRE 0 256 0 128
WIRE 64 256 0 256
WIRE 480 256 480 224
WIRE 512 256 512 208
WIRE 512 256 480 256
WIRE 528 256 512 256
WIRE 624 256 608 256
WIRE -112 272 -128 272
WIRE 448 288 432 288
WIRE -176 320 -176 224
WIRE -64 320 -64 288
WIRE 64 320 -64 320
WIRE 336 368 336 352
WIRE -176 416 -176 400
FLAG -304 64 0
FLAG -192 64 0
FLAG 448 288 0
FLAG -304 -48 +V
FLAG -96 192 0
FLAG -128 160 0
FLAG -128 272 0
FLAG -176 416 0
FLAG 672 240 0
FLAG 736 128 OUT
FLAG 624 112 0
FLAG 624 256 0
FLAG -192 -48 -V
FLAG 336 16 +V
FLAG 48 192 +V
FLAG 336 368 -V
SYMBOL voltage -304 -48 R0
WINDOW 123 24 138 Left 2
WINDOW 39 24 117 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL voltage -192 -48 R0
WINDOW 123 24 138 Left 2
WINDOW 39 24 117 Left 2
SYMATTR InstName V2
SYMATTR Value -1.5
SYMBOL e -64 80 R0
SYMATTR InstName E1
SYMATTR Value .5
SYMBOL e -64 192 R0
SYMATTR InstName E2
SYMATTR Value .5
SYMBOL e2 672 128 R0
SYMATTR InstName E3
SYMATTR Value 1
SYMBOL res 624 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 300
SYMBOL res 624 240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 300
SYMBOL LTC6605-7 256 192 R0
SYMATTR InstName U1
SYMBOL voltage -176 304 R0
SYMATTR InstName V3
SYMATTR Value AC 1
TEXT 480 480 Left 2 !.ac oct 20 100K 100Meg
TEXT 472 328 Left 2 !.measure pt1 find V(out) at 3.5Meg\n.measure pt2 find V(out) at 5.25Meg\n.measure pt3 find V(out) at 7Meg\n.measure pt4 find V(out) at 14Meg\n.measure pt5 find V(out) at 35Meg