* Z:\home\khalils\Downloads\files\data\raw_asc\1987fd1c7fe1_Simulacion_cuadrada_1000rads_Gamberale.asc
* Generated by LTspice 26.0.1 for Windows.
V1 V+ 0 15
R3 Vb N003 100K
R2 Vo Va 200K
R4 Vc Vb 10K
XU3 N001 N002 V+ V- N002 TL081 ;pnba In+)In-)V+)V-)OUT
V2 V- 0 -15
C2 Vo Va 6.8n
Rff P001 N002 47
C1 Va P001 100n
R1 Va N002 100K
C3 Vc N001 3.3n
C4 0 Vb 68n
R5 Vb N001 100K
Vi N003 0 PULSE(-0.1 0.1 0 1n 1n 3.142m 6.283m)
XU2 0 Vc V+ V- N001 TL081 ;pnba In+)In-)V+)V-)OUT
XU1 0 Va V+ V- Vo TL081 ;pnba In+)In-)V+)V-)OUT
.lib TL081.lib
.tran 0 31.4m 0
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 880 680
WIRE -80 -32 -112 -32
WIRE -64 -32 -80 -32
WIRE -16 -32 -32 -32
WIRE 32 -32 -16 -32
WIRE -608 16 -736 16
WIRE -496 16 -608 16
WIRE -736 48 -736 16
WIRE -608 64 -608 16
WIRE -112 64 -112 -32
WIRE -96 64 -112 64
WIRE 32 64 32 -32
WIRE 32 64 -16 64
WIRE -336 80 -464 80
WIRE -144 96 -160 96
WIRE -464 128 -464 80
WIRE -432 128 -464 128
WIRE -144 128 -144 96
WIRE -112 128 -112 64
WIRE -112 128 -144 128
WIRE -96 128 -112 128
WIRE -832 144 -864 144
WIRE -736 144 -736 128
WIRE -736 144 -752 144
WIRE -720 144 -736 144
WIRE -608 144 -608 128
WIRE -608 144 -640 144
WIRE -576 144 -608 144
WIRE -336 144 -336 80
WIRE -336 144 -368 144
WIRE -304 144 -304 96
WIRE -304 144 -336 144
WIRE 32 144 32 64
WIRE 32 144 -32 144
WIRE 80 144 32 144
WIRE -496 160 -496 16
WIRE -496 160 -512 160
WIRE -432 160 -496 160
WIRE -96 160 -128 160
WIRE -736 176 -736 144
WIRE -576 176 -608 176
WIRE -304 176 -304 144
WIRE -272 176 -304 176
WIRE -144 176 -144 128
WIRE -144 176 -192 176
WIRE -864 192 -864 144
WIRE -128 208 -128 160
WIRE -608 240 -608 176
WIRE -864 288 -864 272
SYMBOL voltage 192 -16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL cap -720 240 R180
WINDOW 0 24 56 Left 2
WINDOW 3 39 33 Left 2
SYMATTR InstName C4
SYMATTR Value 68n
SYMBOL res -208 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rff
SYMATTR Value 47
SYMBOL cap -16 -48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 -23 28 VBottom 2
SYMATTR InstName C2
SYMATTR Value 6.8n
SYMBOL voltage -864 176 R0
WINDOW 123 21 135 Left 2
WINDOW 39 0 0 Left 0
WINDOW 3 13 101 Left 2
SYMATTR Value PULSE(-0.1 0.1 0 1n 1n 3.142m 6.283m)
SYMATTR InstName Vi
SYMBOL res -624 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 51 53 VBottom 2
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL OpAmps\\opamp2 -544 96 R0
SYMATTR InstName U2
SYMATTR Value TL081
SYMBOL OpAmps\\opamp2 -64 80 R0
SYMATTR InstName U1
SYMATTR Value TL081
SYMBOL res -736 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -2 117 VBottom 2
SYMATTR InstName R3
SYMATTR Value 100K
SYMBOL cap -160 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 -33 34 VBottom 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL cap -592 128 R180
WINDOW 0 27 54 Left 2
WINDOW 3 -47 58 Left 2
SYMATTR InstName C3
SYMATTR Value 3.3n
SYMBOL res 0 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -20 49 VBottom 2
SYMATTR InstName R2
SYMATTR Value 200K
SYMBOL OpAmps\\opamp2 -400 80 R0
SYMATTR InstName U3
SYMATTR Value TL081
SYMBOL res -720 144 R180
WINDOW 0 27 76 Left 2
WINDOW 3 30 101 Left 2
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL voltage 192 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL res -176 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 60 69 VBottom 2
SYMATTR InstName R1
SYMATTR Value 100K
FLAG -128 208 0
FLAG -864 288 0
FLAG -608 240 0
FLAG -736 240 0
FLAG 80 144 Vo
FLAG -112 128 Va
FLAG -736 144 Vb
FLAG -608 144 Vc
FLAG 192 0 V+
FLAG -64 112 V+
FLAG -400 112 V+
FLAG -544 128 V+
FLAG 192 80 0
FLAG 192 224 0
FLAG 192 144 V-
FLAG -64 176 V-
FLAG -400 176 V-
FLAG -544 192 V-
TEXT -192 256 Left 2 !.lib TL081.lib
TEXT -192 288 Left 2 !.tran 0 31.4m 0