* SPICE netlist
XU1 N005 N001 OUT1 V+ V- 0 N007 0 N008 N009 N010 N006 N002 OUT2 LT1805 ;pnba +INA)-INA)OUTA)V+)V-)+INB)-INB)+INC)-INC)OUTB)OUTC)+IND)-IND)OUTD
R1 OUT1 N001 10k
R2 N001 IN1 1k
C1 IN1 0 0.1
V1 IN1 N003 PULSE(0 50m 10u 1u 1u 88u 100u) Rser=10
V2 N003 0 PWL(0 0 1m .1)
R3 N009 N007 100k
R4 N007 OUT1 10k
D1 N011 N009 1N4148
R5 V+ N011 2k
D2 N011 N005 1N4148
R6 N005 V- 1Meg
C2 N005 0 0.1
R7 OUT2 N002 10k
R8 N002 IN2 1k
C3 IN2 0 0.1
V3 IN2 N004 PULSE(0 50m 10u 1u 1u 88u 100u) Rser=10
V4 N004 0 PWL(0 0 1m .1)
R9 N010 N008 100k
R10 N008 OUT2 10k
D3 N012 N010 1N4148
R11 V+ N012 2k
D4 N012 N006 1N4148
R12 N006 V- 1Meg
C4 N006 0 0.1
V5 V+ 0 5
V6 V- 0 -5
.tran 1m

* LTspice schematic (.asc)
Version 4.1
SHEET 1 2400 1424
WIRE -192 -712 -288 -712
WIRE 240 -712 144 -712
WIRE -320 -616 -400 -616
WIRE -192 -616 -192 -712
WIRE -192 -616 -240 -616
WIRE -160 -616 -192 -616
WIRE 144 -616 144 -712
WIRE 144 -616 112 -616
WIRE 192 -616 144 -616
WIRE 352 -616 272 -616
WIRE -896 -520 -1200 -520
WIRE -624 -520 -816 -520
WIRE -528 -520 -624 -520
WIRE -400 -520 -400 -616
WIRE -400 -520 -448 -520
WIRE -160 -520 -400 -520
WIRE 352 -520 352 -616
WIRE 352 -520 112 -520
WIRE 400 -520 352 -520
WIRE 576 -520 480 -520
WIRE 816 -520 576 -520
WIRE 1200 -520 896 -520
WIRE -1200 -472 -1200 -520
WIRE -624 -472 -624 -520
WIRE 576 -472 576 -520
WIRE 1200 -472 1200 -520
WIRE -160 -424 -480 -424
WIRE 432 -424 112 -424
WIRE -624 -376 -624 -408
WIRE 576 -376 576 -408
WIRE -1200 -360 -1200 -392
WIRE 1200 -360 1200 -392
WIRE -160 -328 -224 -328
WIRE 192 -328 112 -328
WIRE -480 -296 -480 -424
WIRE -480 -296 -720 -296
WIRE 432 -296 432 -424
WIRE 672 -296 432 -296
WIRE -160 -232 -208 -232
WIRE 160 -232 112 -232
WIRE -160 -136 -352 -136
WIRE 304 -136 112 -136
WIRE -480 -40 -560 -40
WIRE -352 -40 -352 -136
WIRE -352 -40 -400 -40
WIRE -304 -40 -352 -40
WIRE -192 -40 -224 -40
WIRE -160 -40 -192 -40
WIRE 144 -40 112 -40
WIRE 176 -40 144 -40
WIRE 304 -40 304 -136
WIRE 304 -40 256 -40
WIRE 352 -40 304 -40
WIRE 512 -40 432 -40
WIRE -192 72 -192 -40
WIRE 144 72 144 -40
WIRE -720 184 -720 -296
WIRE -608 184 -720 184
WIRE -480 184 -608 184
WIRE -368 184 -480 184
WIRE -192 184 -192 136
WIRE -192 184 -304 184
WIRE 144 184 144 136
WIRE 256 184 144 184
WIRE 432 184 320 184
WIRE 560 184 432 184
WIRE 672 184 672 -296
WIRE 672 184 560 184
WIRE -608 248 -608 184
WIRE -480 248 -480 184
WIRE -192 248 -192 184
WIRE 144 248 144 184
WIRE 432 248 432 184
WIRE 560 248 560 184
WIRE -608 392 -608 312
WIRE -480 392 -480 328
WIRE -432 392 -480 392
WIRE 432 392 432 328
WIRE 432 392 384 392
WIRE 560 392 560 312
WIRE -192 408 -192 328
WIRE -160 408 -192 408
WIRE 144 408 144 328
WIRE 144 408 112 408
WIRE -112 520 -176 520
WIRE 112 520 48 520
WIRE -112 568 -112 520
WIRE 48 568 48 520
WIRE -112 712 -112 648
WIRE 48 712 48 648
FLAG -288 -712 OUT1
FLAG -624 -376 0
FLAG -1200 -360 0
FLAG -624 -520 IN1
FLAG -208 -232 0
FLAG -560 -40 OUT1
FLAG -160 408 V+
FLAG -432 392 V-
FLAG -608 392 0
FLAG 240 -712 OUT2
FLAG 576 -376 0
FLAG 1200 -360 0
FLAG 576 -520 IN2
FLAG 160 -232 0
FLAG 512 -40 OUT2
FLAG 112 408 V+
FLAG 384 392 V-
FLAG 560 392 0
FLAG 192 -328 V+
FLAG -224 -328 V-
FLAG -112 712 0
FLAG 48 712 0
FLAG -176 520 V+
FLAG 112 520 V-
SYMBOL LT1805 -32 -360 R0
SYMATTR InstName U1
SYMBOL res -224 -632 R90
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -432 -536 R90
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL cap -640 -472 R0
SYMATTR InstName C1
SYMATTR Value 0.1
SYMBOL voltage -800 -520 R90
SYMATTR InstName V1
SYMATTR Value PULSE(0 50m 10u 1u 1u 88u 100u)
SYMATTR Value2 Rser=10
SYMBOL voltage -1200 -488 R0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 1m .1)
SYMBOL res -208 -56 R90
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res -384 -56 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL diode -176 136 R180
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res -176 344 R180
SYMATTR InstName R5
SYMATTR Value 2k
SYMBOL diode -304 168 R90
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res -496 232 R0
SYMATTR InstName R6
SYMATTR Value 1Meg
SYMBOL cap -624 248 R0
SYMATTR InstName C2
SYMATTR Value 0.1
SYMBOL res 176 -632 M90
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 -536 M90
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL cap 592 -472 M0
SYMATTR InstName C3
SYMATTR Value 0.1
SYMBOL voltage 800 -520 M90
SYMATTR InstName V3
SYMATTR Value PULSE(0 50m 10u 1u 1u 88u 100u)
SYMATTR Value2 Rser=10
SYMBOL voltage 1200 -488 M0
SYMATTR InstName V4
SYMATTR Value PWL(0 0 1m .1)
SYMBOL res 160 -56 M90
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL res 336 -56 M90
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL diode 128 136 M180
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL res 128 344 M180
SYMATTR InstName R11
SYMATTR Value 2k
SYMBOL diode 256 168 M90
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL res 448 232 M0
SYMATTR InstName R12
SYMATTR Value 1Meg
SYMBOL cap 576 248 M0
SYMATTR InstName C4
SYMATTR Value 0.1
SYMBOL voltage -112 552 R0
SYMATTR InstName V5
SYMATTR Value 5
SYMBOL voltage 48 552 R0
SYMATTR InstName V6
SYMATTR Value -5