* SPICE netlist
M1 N002 N003 N006 N006 AO6408
M2 N003 N002 N007 N007 AO6408
R4 N001 N003 200
R5 N001 N002 200
M3 N004 N006 N010 N010 AO6408
M4 N005 N007 N010 N010 AO6408
C2 N007 N006 0.4p
M10 N004 N005 N008 N008 AO6408
M11 N005 N004 N009 N009 AO6408
R6 N001 N005 200
R7 N001 N004 200
M12 N003 N008 N011 N011 AO6408
M13 N002 N009 N011 N011 AO6408
C3 N009 N008 0.4p
V2 N001 0 3
I1 N010 0 2m
I2 N011 0 2m
I3 N007 0 3m
I4 N008 0 3m
I5 N009 0 3m
I6 N006 0 3m
.tran 0 10m 0 10n startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1216 896
WIRE -496 -448 -608 -448
WIRE -144 -448 -496 -448
WIRE 160 -448 -144 -448
WIRE 512 -448 160 -448
WIRE -608 -400 -608 -448
WIRE -496 -352 -496 -448
WIRE -144 -352 -144 -448
WIRE 160 -352 160 -448
WIRE 512 -352 512 -448
WIRE -608 -288 -608 -320
WIRE -496 -240 -496 -272
WIRE -400 -240 -496 -240
WIRE -144 -240 -144 -272
WIRE -144 -240 -224 -240
WIRE 160 -240 160 -272
WIRE 256 -240 160 -240
WIRE 512 -240 512 -272
WIRE 512 -240 432 -240
WIRE -496 -208 -496 -240
WIRE -496 -208 -608 -208
WIRE -224 -208 -496 -208
WIRE 160 -208 160 -240
WIRE 160 -208 64 -208
WIRE 432 -208 160 -208
WIRE -144 -176 -144 -240
WIRE -144 -176 -400 -176
WIRE -48 -176 -144 -176
WIRE 512 -176 512 -240
WIRE 512 -176 256 -176
WIRE 608 -176 512 -176
WIRE -496 -160 -496 -208
WIRE -144 -160 -144 -176
WIRE 160 -160 160 -208
WIRE 512 -160 512 -176
WIRE -400 -80 -400 -176
WIRE -400 -80 -448 -80
WIRE -224 -80 -224 -208
WIRE -192 -80 -224 -80
WIRE 256 -80 256 -176
WIRE 256 -80 208 -80
WIRE 432 -80 432 -208
WIRE 464 -80 432 -80
WIRE -496 -32 -496 -64
WIRE -496 -32 -560 -32
WIRE -352 -32 -496 -32
WIRE -144 -32 -144 -64
WIRE -144 -32 -288 -32
WIRE -96 -32 -144 -32
WIRE 160 -32 160 -64
WIRE 160 -32 112 -32
WIRE 304 -32 160 -32
WIRE 512 -32 512 -64
WIRE 512 -32 368 -32
WIRE 560 -32 512 -32
WIRE -608 16 -608 -208
WIRE 416 16 -608 16
WIRE -48 32 -48 -176
WIRE 256 32 -48 32
WIRE 64 48 64 -208
WIRE 64 48 -400 48
WIRE 608 64 608 -176
WIRE 608 64 -240 64
WIRE -560 96 -560 -32
WIRE -96 96 -96 -32
WIRE 112 96 112 -32
WIRE 560 96 560 -32
WIRE -400 112 -400 48
WIRE -240 112 -240 64
WIRE 256 112 256 32
WIRE 416 112 416 16
WIRE -496 192 -496 -32
WIRE -448 192 -496 192
WIRE -144 192 -144 -32
WIRE -144 192 -192 192
WIRE 160 192 160 -32
WIRE 208 192 160 192
WIRE 512 192 512 -32
WIRE 512 192 464 192
WIRE -320 208 -400 208
WIRE -240 208 -320 208
WIRE 336 208 256 208
WIRE 416 208 336 208
WIRE -560 256 -560 176
WIRE -96 256 -96 176
WIRE -96 256 -560 256
WIRE 16 256 -96 256
WIRE 112 256 112 176
WIRE 112 256 16 256
WIRE 560 256 560 176
WIRE 560 256 112 256
WIRE 16 288 16 256
WIRE -320 304 -320 208
WIRE 336 304 336 208
WIRE -320 448 -320 384
WIRE 336 448 336 384
FLAG -608 -288 0
FLAG -320 448 0
FLAG 336 448 0
FLAG 16 288 0
SYMBOL nmos -448 -160 M0
SYMATTR InstName M1
SYMATTR Value AO6408
SYMBOL nmos -192 -160 R0
SYMATTR InstName M2
SYMATTR Value AO6408
SYMBOL res -160 -368 R0
SYMATTR InstName R4
SYMATTR Value 200
SYMBOL res -512 -368 R0
SYMATTR InstName R5
SYMATTR Value 200
SYMBOL nmos -448 112 R0
SYMATTR InstName M3
SYMATTR Value AO6408
SYMBOL nmos -192 112 M0
SYMATTR InstName M4
SYMATTR Value AO6408
SYMBOL cap -288 -48 R90
SYMATTR InstName C2
SYMATTR Value 0.4p
SYMBOL nmos 208 -160 M0
SYMATTR InstName M10
SYMATTR Value AO6408
SYMBOL nmos 464 -160 R0
SYMATTR InstName M11
SYMATTR Value AO6408
SYMBOL res 496 -368 R0
SYMATTR InstName R6
SYMATTR Value 200
SYMBOL res 144 -368 R0
SYMATTR InstName R7
SYMATTR Value 200
SYMBOL nmos 208 112 R0
SYMATTR InstName M12
SYMATTR Value AO6408
SYMBOL nmos 464 112 M0
SYMATTR InstName M13
SYMATTR Value AO6408
SYMBOL cap 368 -48 R90
SYMATTR InstName C3
SYMATTR Value 0.4p
SYMBOL voltage -608 -416 R0
SYMATTR InstName V2
SYMATTR Value 3
SYMBOL current -320 304 R0
SYMATTR InstName I1
SYMATTR Value 2m
SYMBOL current 336 304 R0
SYMATTR InstName I2
SYMATTR Value 2m
SYMBOL current -96 96 R0
SYMATTR InstName I3
SYMATTR Value 3m
SYMBOL current 112 96 R0
SYMATTR InstName I4
SYMATTR Value 3m
SYMBOL current 560 96 R0
SYMATTR InstName I5
SYMATTR Value 3m
SYMBOL current -560 96 R0
SYMATTR InstName I6
SYMATTR Value 3m