* SPICE netlist
MSU2 VDD N002 N002 VDD P_50n L=1u W=500n
MSU1 N002 Vbiasn 0 0 N_50n L=100n W=2.5u
MSU3 Vbiasp N002 Vbiasn 0 N_50n L=50n W=500n
M3 VDD Vbiasp Vbiasn VDD P_50n l=100n w=5u
M4 VDD Vbiasp N003 VDD P_50n l=100n w=5u
M1 Vbiasn Vbiasn 0 0 N_50n L=100n W=2.5u
R1 N004 0 5.5k
MA4 VDD N001 Vbiasp VDD P_50n l=100n w=5u
MA3 VDD N001 N001 VDD P_50n l=100n w=5u
M5 N001 N003 0 0 N_50n L=100n W=2.5u
M7 VDD Vbiasp VDD VDD P_50n l=5u w=5u
M8 0 Vbiasn 0 0 N_50n l=5u w=5u
M2 Vbiasp Vbiasn 0 0 N_50n L=100n W=2.5u
M6 N003 N003 N004 0 N_50n l=100n w=10u

* LTspice schematic (.asc)
Version 4
SHEET 1 1360 560
WIRE -680 -184 -680 -280
WIRE -680 -72 -680 -88
WIRE -680 72 -680 -72
WIRE -680 264 -680 168
WIRE -616 -104 -632 -104
WIRE -616 -72 -680 -72
WIRE -616 -72 -616 -104
WIRE -584 -72 -616 -72
WIRE -536 -152 -536 -184
WIRE -536 152 -632 152
WIRE -536 152 -536 -56
WIRE -376 152 -536 152
WIRE -376 152 -376 -56
WIRE -216 -56 -376 -56
WIRE -216 -56 -216 -88
WIRE -216 40 -216 -56
WIRE -216 56 -216 40
WIRE -216 184 -216 152
WIRE -152 56 -216 56
WIRE -152 136 -168 136
WIRE -152 136 -152 56
WIRE -8 -120 -8 -136
WIRE -8 56 -8 -120
WIRE -8 72 -8 56
WIRE -8 184 -8 152
WIRE 40 -120 -8 -120
WIRE 40 -120 40 -152
WIRE 56 136 40 136
WIRE 56 136 56 8
WIRE 104 40 -216 40
WIRE 104 136 104 40
WIRE 120 -152 40 -152
WIRE 120 136 104 136
WIRE 168 -104 -168 -104
WIRE 168 -104 168 -136
WIRE 168 56 168 -104
WIRE 168 72 168 56
WIRE 168 184 168 152
WIRE 280 -104 168 -104
WIRE 280 -72 280 -104
WIRE 296 136 296 56
WIRE 312 -104 280 -104
WIRE 312 136 296 136
WIRE 360 8 56 8
WIRE 360 8 360 -88
WIRE 360 56 296 56
WIRE 360 56 360 8
WIRE 360 168 360 152
WIRE 360 280 360 248
WIRE 600 -72 280 -72
WIRE 600 -72 600 -136
WIRE 600 40 104 40
WIRE 600 136 600 40
WIRE 632 -72 600 -72
WIRE 632 40 600 40
FLAG -680 -136 VDD
FLAG -536 -184 Vbiasp
FLAG -216 -136 VDD
FLAG -216 -184 VDD
FLAG 360 -136 VDD
FLAG 360 -184 VDD
FLAG 360 280 0
FLAG 360 104 0
FLAG 168 -184 VDD
FLAG 168 -232 VDD
FLAG -8 -184 VDD
FLAG -8 -232 VDD
FLAG 168 104 0
FLAG 568 -184 VDD
FLAG 520 -184 VDD
FLAG 616 -184 VDD
FLAG -680 -280 VDD
IOPIN 544 -272 In
FLAG -680 264 GND
IOPIN 544 272 In
FLAG -536 -104 0
FLAG -680 120 0
FLAG -216 184 0
FLAG -216 104 0
FLAG -8 104 0
FLAG -8 184 0
FLAG 632 184 0
FLAG 680 184 0
FLAG 584 184 0
FLAG 168 184 0
FLAG 632 -72 Vbiasp
IOPIN 1856 -64 Out
FLAG 632 40 Vbiasn
IOPIN 1856 48 Out
SYMBOL pmos4 -632 -184 M0
SYMATTR InstName MSU2
SYMATTR Value2 L=1u W=500n
SYMATTR Value P_50n
SYMBOL nmos4 -632 72 M0
SYMATTR Value2 L=100n W=2.5u
SYMATTR InstName MSU1
SYMATTR Value N_50n
SYMBOL nmos4 -584 -152 R0
SYMATTR Value2 L=50n W=500n
SYMATTR InstName MSU3
SYMATTR Value N_50n
SYMBOL pmos4 -168 -184 M0
SYMATTR InstName M3
SYMATTR Value2 l=100n w=5u
SYMATTR Value P_50n
SYMBOL pmos4 312 -184 R0
SYMATTR InstName M4
SYMATTR Value2 l=100n w=5u
SYMATTR Value P_50n
SYMBOL nmos4 -168 56 M0
SYMATTR Value2 L=100n W=2.5u
SYMATTR InstName M1
SYMATTR Value N_50n
SYMBOL res 344 152 R0
SYMATTR InstName R1
SYMATTR Value 5.5k
SYMBOL pmos4 120 -232 R0
SYMATTR InstName MA4
SYMATTR Value2 l=100n w=5u
SYMATTR Value P_50n
SYMBOL pmos4 40 -232 M0
SYMATTR InstName MA3
SYMATTR Value2 l=100n w=5u
SYMATTR Value P_50n
SYMBOL nmos4 40 56 M0
SYMATTR Value2 L=100n W=2.5u
SYMATTR InstName M5
SYMATTR Value N_50n
SYMBOL pmos4 520 -136 R270
SYMATTR InstName M7
SYMATTR Value2 l=5u w=5u
SYMATTR Value P_50n
SYMBOL nmos4 680 136 R90
SYMATTR Value2 l=5u w=5u
SYMATTR InstName M8
SYMATTR Value N_50n
SYMBOL nmos4 120 56 R0
SYMATTR Value2 L=100n W=2.5u
SYMATTR InstName M2
SYMATTR Value N_50n
SYMBOL nmos4 312 56 R0
SYMATTR Value2 l=100n w=10u
SYMATTR InstName M6
SYMATTR Value N_50n