Version 4
SHEET 1 2268 680
WIRE 304 -320 256 -320
WIRE 416 -320 384 -320
WIRE -176 -272 -176 -304
WIRE 80 -272 -80 -272
WIRE -304 -256 -304 -304
WIRE 336 -208 336 -240
WIRE 944 -208 944 -240
WIRE 0 -192 0 -224
WIRE 256 -192 256 -320
WIRE 304 -192 256 -192
WIRE -80 -176 -80 -272
WIRE -32 -176 -80 -176
WIRE 416 -176 416 -320
WIRE 416 -176 368 -176
WIRE 464 -176 416 -176
WIRE 80 -160 80 -272
WIRE 80 -160 32 -160
WIRE 128 -160 80 -160
WIRE 304 -160 208 -160
WIRE -176 -144 -176 -192
WIRE -32 -144 -176 -144
WIRE -304 -128 -304 -176
WIRE -176 -96 -176 -144
WIRE 256 -96 256 -192
WIRE 1024 -96 1024 -128
WIRE 944 -80 944 -128
WIRE 992 -80 944 -80
WIRE 1120 -64 1056 -64
WIRE 1168 -64 1120 -64
WIRE 592 -48 544 -48
WIRE 720 -48 672 -48
WIRE 864 -48 800 -48
WIRE 992 -48 864 -48
WIRE 1120 -16 1120 -64
WIRE 864 0 864 -48
WIRE -176 16 -176 -16
WIRE 0 16 0 -128
WIRE 256 16 256 -16
WIRE -144 112 -192 112
WIRE -16 112 -64 112
WIRE 128 112 64 112
WIRE 160 112 128 112
WIRE 256 112 256 80
WIRE 256 112 224 112
WIRE 944 112 944 -80
WIRE 1120 112 1120 64
WIRE 1120 112 944 112
WIRE -304 160 -304 112
WIRE 128 160 128 112
WIRE 256 160 256 112
WIRE 1120 160 1120 112
WIRE -304 288 -304 240
WIRE 128 288 128 224
WIRE 256 288 256 240
WIRE 336 288 336 -144
WIRE 864 288 864 64
WIRE 1024 288 1024 -32
WIRE 1120 288 1120 240
FLAG 128 288 0
FLAG -304 -128 0
FLAG -176 16 0
FLAG 336 288 0
FLAG 464 -176 OUT1
FLAG 256 288 0
FLAG -304 288 0
FLAG 0 16 0
FLAG -304 112 DAC
FLAG 864 288 0
FLAG 544 -48 DAC
FLAG -304 -304 3V3
FLAG 0 -224 3V3
FLAG 336 -240 3V3
FLAG -176 -304 3V3
FLAG 1024 -128 3V3
FLAG 1024 288 0
FLAG 944 -240 3V3
FLAG 1120 288 0
FLAG 1168 -64 OUT2
FLAG -192 112 DAC
SYMBOL ind -32 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 79.577µ
SYMBOL cap 112 160 R0
SYMATTR InstName C1
SYMATTR Value 7.958n
SYMBOL res -48 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL voltage -304 -272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL voltage -304 144 R0
WINDOW 3 24 106 Left 2
WINDOW 123 39 38 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 40 20 Left 2
SYMATTR Value SINE(1.65 0.3 100k)
SYMATTR Value2 AC 0.3
SYMATTR InstName V2
SYMBOL res -192 -288 R0
SYMATTR InstName R3
SYMATTR Value 500
SYMBOL res -192 -112 R0
SYMATTR InstName R4
SYMATTR Value 500
SYMBOL cap 224 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100µ
SYMBOL res 224 -176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 90k
SYMBOL res 240 -112 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL Opamps\\LT1807 336 -240 R0
SYMATTR InstName U1
SYMBOL res 400 -336 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 90k
SYMBOL Opamps\\LT1807 0 -224 R0
SYMATTR InstName U2
SYMBOL res 240 144 R0
SYMATTR InstName R8
SYMATTR Value 100
SYMBOL cap 240 16 R0
SYMATTR InstName C3
SYMATTR Value 1µ
SYMBOL ind 704 -32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L2
SYMATTR Value 68µ
SYMBOL cap 848 0 R0
SYMATTR InstName C4
SYMATTR Value 4n7
SYMBOL res 688 -64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 180
SYMBOL Opamps\\LT1807 1024 -128 R0
SYMATTR InstName U3
SYMBOL res 928 -224 R0
SYMATTR InstName R9
SYMATTR Value 4k7
SYMBOL res 1104 144 R0
SYMATTR InstName R10
SYMATTR Value 4k7
SYMBOL res 1104 -32 R0
SYMATTR InstName R11
SYMATTR Value 8k2
TEXT 496 256 Left 2 !.ac dec 1000 10 3Meg
TEXT 496 232 Left 2 ;.tran 0 50u 0 10n
TEXT 496 280 Left 2 !.option plotwinsize=0