Diode logic gates

1. Gate 1

diode or

Table 1. Logic function:
V_A	V_B	V_Y
0	0
0	5
5	0
5	5

guess (on / off) state of each diode
solve circuit
check corresponding condition, repeat until all checks pass

1.1. Inputs: A=0 V, B=0 V

1.2. Inputs: A=0 V, B=5 V

2. Gate 2

diode and

Table 2. Logic function:
V_A	V_B	V_Y
0	0
0	5
5	0
5	5

3. Gate 3

diode and or

Table 3. Logic function:
V_A	V_B	V_C	V_x	V_out
0	0	0
0	0	5
0	5	0
0	5	5
5	0	0
5	0	5
5	5	0
5	5	5