S1
S2
S3
V
out
0
0
0
0
0
0
1
-V
in
/8
0
1
0
-2V
in
/8 = -V
in
/4
0
1
1
-3V
in
/8
1
0
0
-4V
in
/8 = -V
in
/2
1
0
1
-5V
in
/8
1
1
0
-6V
in
/8 = -3V
in
/4
1
1
1
-7V
in
/8