A scheme of a diode circuit is attached. The voltages at the inputs A and B are 5V.
A. What is the output voltage (=voltage at the black node, Z)?
B. What values of resistance would you recommend for the resistor R?
2. The attempt at a solution
A. The diodes D1 and D2 are reverse biased (the voltage on the anode is less than the voltage on the cathode). So the output voltage should be (5V - voltage drop across the resistor).
B. Since this is a diode AND gate and both inputs are equal to logical 1 (5V), the output should be also logical 1. That means its value should approach 5V. This is the case when the voltage drop across the resistor is low -> thus its resistance should be low.
Could anyone, please, comment on my solution. Is it correct? Do you know what the standard resistance of the resistor R is?