Version 4
SHEET 1 1120 680
WIRE -1008 96 -1008 64
WIRE -800 96 -800 64
WIRE -912 176 -960 176
WIRE -848 176 -912 176
WIRE -800 208 -800 192
WIRE -656 208 -800 208
WIRE -624 208 -656 208
WIRE -1008 224 -1008 192
WIRE -912 224 -912 176
WIRE -912 224 -1008 224
WIRE -800 224 -800 208
WIRE -1008 272 -1008 224
WIRE -800 320 -800 304
WIRE -1056 352 -1088 352
WIRE -1008 400 -1008 368
WIRE -944 400 -1008 400
WIRE -816 400 -864 400
WIRE -768 400 -816 400
WIRE -656 400 -656 208
WIRE -656 400 -688 400
WIRE -1008 416 -1008 400
WIRE -816 416 -816 400
WIRE -1008 512 -1008 496
WIRE -816 512 -816 496
FLAG -800 64 Vdd
IOPIN -800 64 BiDir
FLAG -1008 64 Vdd
IOPIN -1008 64 BiDir
FLAG -800 320 0
FLAG -624 208 vo
IOPIN -624 208 In
FLAG -1088 352 vi
IOPIN -1088 352 In
FLAG -816 512 0
FLAG -1008 512 0
SYMBOL nmos -1056 272 R0
SYMATTR InstName M1
SYMBOL pmos -848 96 R0
SYMATTR InstName M2
SYMBOL res -848 384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMBOL res -672 384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMBOL res -800 512 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMBOL res -992 512 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMBOL current -800 224 R0
SYMATTR InstName I1
SYMBOL pmos -960 96 M0
SYMATTR InstName M3