Version 4
SHEET 1 968 680
WIRE 288 -192 240 -192
WIRE 576 -192 288 -192
WIRE 288 -144 288 -192
WIRE -48 -112 -368 -112
WIRE 288 -32 288 -64
WIRE 576 -32 576 -192
WIRE -48 -16 -48 -112
WIRE 384 16 144 16
WIRE 240 48 240 -192
WIRE 144 96 144 16
WIRE 208 96 144 96
WIRE -368 112 -368 -112
WIRE 384 128 384 16
WIRE 384 128 352 128
WIRE 576 128 576 48
WIRE 576 128 384 128
WIRE 704 128 576 128
WIRE 896 128 784 128
WIRE -48 160 -48 64
WIRE 208 160 -48 160
WIRE 896 208 896 128
WIRE -48 224 -48 160
WIRE 576 240 576 128
WIRE 240 288 240 208
WIRE -368 368 -368 192
WIRE -160 368 -368 368
WIRE -48 368 -48 304
WIRE -48 368 -160 368
WIRE -160 432 -160 368
WIRE 240 432 240 368
WIRE 576 432 576 320
WIRE 896 432 896 272
FLAG 288 -32 0
FLAG 240 432 0
FLAG -160 432 0
FLAG 576 432 0
FLAG 896 432 0
SYMBOL Opamps\\LT1637 240 128 R0
SYMATTR InstName U1
SYMBOL voltage 288 -160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL voltage 240 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value -3.3
SYMBOL res -64 -32 R0
SYMATTR InstName R1
SYMATTR Value 3980k
SYMBOL res -64 208 R0
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL voltage -368 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 325 50)
SYMBOL res 560 -48 R0
SYMATTR InstName R3
SYMATTR Value 20k
SYMBOL res 560 224 R0
SYMATTR InstName R4
SYMATTR Value 20k
SYMBOL res 800 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL cap 880 208 R0
SYMATTR InstName C1
SYMATTR Value 100n
TEXT -402 456 Left 2 !.tran 0 50m 0