Version 4
SHEET 1 896 680
WIRE 160 -256 -32 -256
WIRE 160 -224 160 -256
WIRE 112 -112 80 -112
WIRE 160 -112 160 -144
WIRE 160 -112 112 -112
WIRE 416 -112 304 -112
WIRE 480 -112 416 -112
WIRE 592 -112 480 -112
WIRE 160 -80 160 -112
WIRE 416 -16 416 -112
WIRE 160 32 160 0
WIRE 208 32 160 32
WIRE 352 32 208 32
WIRE 448 32 432 32
WIRE 160 64 160 32
WIRE 448 80 448 32
WIRE 448 80 416 80
WIRE 80 112 80 -112
WIRE 96 112 80 112
WIRE 192 112 176 112
WIRE 592 144 592 -112
WIRE 192 160 192 112
WIRE 192 160 160 160
WIRE 160 192 160 160
WIRE 416 192 416 80
WIRE 160 224 160 192
WIRE 160 224 80 224
WIRE 160 256 160 224
WIRE 416 256 416 192
WIRE 80 304 80 224
WIRE 96 304 80 304
WIRE 192 304 176 304
WIRE 304 304 304 -112
WIRE 352 304 304 304
WIRE 448 304 432 304
WIRE 192 352 192 304
WIRE 192 352 160 352
WIRE 448 352 448 304
WIRE 448 352 416 352
WIRE -32 384 -32 -256
WIRE 160 384 160 352
WIRE 160 384 -32 384
WIRE 224 384 160 384
WIRE 416 384 416 352
WIRE 416 384 224 384
WIRE 592 384 592 224
WIRE 592 384 416 384
WIRE 224 400 224 384
FLAG 224 400 0
FLAG 208 32 UBIAS
FLAG 480 -112 UOUT
FLAG 160 192 UA
FLAG 416 192 UB
FLAG 112 -112 XX
SYMBOL voltage 592 128 R0
SYMATTR InstName VDD
SYMATTR Value 3
SYMBOL AMScells\\n4 112 256 R0
SYMATTR InstName U1
SYMBOL AMScells\\n4 112 64 R0
SYMATTR InstName U2
SYMBOL AMScells\\n4 368 -16 R0
SYMATTR InstName U3
SYMBOL AMScells\\n4 368 256 R0
SYMATTR InstName U4
SYMBOL res 144 -96 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL current 160 -224 R0
SYMATTR InstName IREF
SYMATTR Value 20µ
TEXT -32 456 Left 2 !.include C:/programs/LTspiceIV/lib/sub/AMSlev49.sub
TEXT -24 416 Left 2 !.dc VDD 0 3 1m