Two ideal diodes have anodes connected separately to inputs A and B, cathodes joined at Y, and a resistor pulls Y to ground. The circuit behaves as:
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Question

Two ideal diodes have anodes connected separately to inputs A and B, cathodes joined at Y, and a resistor pulls Y to ground. The circuit behaves as:

G1 Physics · Accepted Answer

Any HIGH input forward-biases its diode and makes Y HIGH. With both LOW, Y is LOW: OR logic.