Version 4
SHEET 1 896 680
WIRE 80 -144 -32 -144
WIRE 160 -144 80 -144
WIRE 560 -144 496 -144
WIRE 672 -144 560 -144
WIRE 160 -112 160 -144
WIRE 496 -16 496 -144
WIRE 160 32 160 -32
WIRE 400 32 160 32
WIRE 432 32 400 32
WIRE 528 32 512 32
WIRE -32 64 -32 -144
WIRE 160 64 160 32
WIRE 528 80 528 32
WIRE 528 80 496 80
WIRE 80 112 80 -144
WIRE 96 112 80 112
WIRE 192 112 176 112
WIRE 672 144 672 -144
WIRE 192 160 192 112
WIRE 192 160 160 160
WIRE 160 192 160 160
WIRE 496 192 496 80
WIRE 160 224 160 192
WIRE 160 224 80 224
WIRE 384 224 160 224
WIRE 160 256 160 224
WIRE 496 256 496 192
WIRE 80 304 80 224
WIRE 96 304 80 304
WIRE 192 304 176 304
WIRE 384 304 384 224
WIRE 432 304 384 304
WIRE 528 304 512 304
WIRE 192 352 192 304
WIRE 192 352 160 352
WIRE 528 352 528 304
WIRE 528 352 496 352
WIRE -32 384 -32 144
WIRE 160 384 160 352
WIRE 160 384 -32 384
WIRE 224 384 160 384
WIRE 496 384 496 352
WIRE 496 384 224 384
WIRE 672 384 672 224
WIRE 672 384 496 384
WIRE 224 400 224 384
FLAG 224 400 0
FLAG 400 32 UBIAS
FLAG 560 -144 UOUT
FLAG 160 192 UA
FLAG 496 192 UB
SYMBOL voltage 672 128 R0
SYMATTR InstName VD
SYMATTR Value 3
SYMBOL AMScells\\n4 112 256 R0
SYMATTR InstName U1
SYMBOL AMScells\\n4 448 -16 R0
SYMATTR InstName U3
SYMBOL AMScells\\n4 448 256 R0
SYMATTR InstName U4
SYMBOL current 160 -112 R0
SYMATTR InstName IREF
SYMATTR Value 10µ
SYMBOL voltage -32 48 R0
SYMATTR InstName VDD
SYMATTR Value 3
SYMBOL AMScells\\n4 112 64 R0
SYMATTR InstName U2
SYMATTR SpiceLine wu=2  lu=8
TEXT -32 456 Left 2 !.include C:/programs/LTspiceIV/lib/sub/AMSlev49.sub
TEXT -24 416 Left 2 !.dc VD 0 3 1m