Version 4
SHEET 1 1112 928
WIRE -496 -144 -496 -160
WIRE -368 -144 -368 -160
WIRE 240 -128 48 -128
WIRE 432 -128 320 -128
WIRE -496 -48 -496 -64
WIRE -368 -48 -368 -64
WIRE 144 -48 144 -64
WIRE 48 64 48 -128
WIRE 112 64 48 64
WIRE 832 80 784 80
WIRE -496 96 -496 80
WIRE -368 96 -368 80
WIRE 432 96 432 -128
WIRE 432 96 384 96
WIRE 528 96 432 96
WIRE 528 112 528 96
WIRE 704 112 704 80
WIRE 784 112 784 80
WIRE 112 128 -192 128
WIRE -496 192 -496 176
WIRE -368 192 -368 176
WIRE -192 224 -192 128
WIRE -240 240 -304 240
WIRE 144 256 144 240
WIRE 48 272 48 64
WIRE -240 288 -256 288
WIRE -464 320 -480 320
WIRE -304 320 -304 240
WIRE -304 320 -384 320
WIRE -192 336 -192 304
WIRE -112 336 -192 336
WIRE 0 336 -32 336
WIRE -192 368 -192 336
WIRE -304 384 -304 320
WIRE -240 384 -304 384
WIRE 48 384 48 352
WIRE 240 384 48 384
WIRE 432 384 320 384
WIRE 528 384 528 368
WIRE 528 384 432 384
WIRE 784 400 784 368
WIRE 704 416 704 368
WIRE -240 432 -256 432
WIRE 144 448 144 432
WIRE 48 560 48 384
WIRE 112 560 48 560
WIRE 432 592 432 384
WIRE 432 592 384 592
WIRE -192 624 -192 448
WIRE 112 624 -192 624
FLAG -368 -48 0
FLAG 144 -64 +V
FLAG -368 -160 +V
FLAG 144 256 -V
FLAG -496 -48 0
FLAG -496 -160 -V
FLAG -480 320 0
FLAG 144 432 +V
FLAG 144 736 -V
FLAG 704 80 +VL
FLAG 704 416 -VL
FLAG -368 192 0
FLAG -368 80 +VL
FLAG -496 192 0
FLAG -496 80 -VL
FLAG 784 400 0
FLAG 832 80 OUT
FLAG -256 288 0
FLAG -256 432 0
FLAG 0 336 0
SYMBOL voltage -368 -160 R0
SYMATTR InstName V1
SYMATTR Value 30
SYMBOL voltage -496 -160 R0
SYMATTR InstName V2
SYMATTR Value -30
SYMBOL voltage -368 320 R90
WINDOW 123 74 56 VTop 2
WINDOW 39 53 56 VTop 2
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName V3
SYMATTR Value SINE(0 39m 1K)
SYMBOL res 336 -144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 11.5K
SYMBOL LTC2057 272 96 R0
SYMATTR InstName U2
SYMBOL Opamps\\LT1991 704 240 R0
SYMATTR InstName U1
SYMBOL res 336 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 11.5K
SYMBOL LTC2057 272 592 R0
SYMATTR InstName U3
SYMBOL voltage -368 80 R0
SYMATTR InstName V4
SYMATTR Value 18
SYMBOL voltage -496 80 R0
SYMATTR InstName V5
SYMATTR Value -18
SYMBOL res 32 256 R0
SYMATTR InstName R2
SYMATTR Value 232
SYMBOL e -192 208 R0
SYMATTR InstName E1
SYMATTR Value .5
SYMBOL e -192 352 R0
SYMATTR InstName E2
SYMATTR Value .5
SYMBOL voltage -128 336 R270
WINDOW 123 -74 56 VBottom 2
WINDOW 39 -53 56 VBottom 2
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
SYMATTR InstName Vcm
SYMATTR Value -28
TEXT 664 656 Left 2 !.tran 3m