What are the applications of AND and OR gates using diodes?

[logearav]

Homework Statement

http://www.play-hookey.com/digital/electronics/dl_gates.html
revered members,
in the above link, for OR GATE, when either of the diodes are forward biased we get the output voltage as logic HIGH.
but for AND GATE, when when either of the diodes are forward biased or both forward biased we get the output voltage as logic LOW.
it has been mentioned that resistor works a pull down resistor in the case of AND GATE. i.e, resistance in AND gate makes the output to go low even if the diodes conduct.
i don't understand the concepts involved. please help how this works.

Homework Equations

The Attempt at a Solution

 

[xcvxcvvc]

What parts do you specifically not understand? Do you not understand how diodes behave, or are you having trouble applying that behavior to the creation of logic gates?

 

[logearav]

thanks for the reply.
in OR GATE if any input is 1 either of the diodes is forward biased and start to conduct and if both the inputs are 1 then both the diodes start to conduct and the current flows thro the load resistance and we get the output high that is logic 1.
but in AND gate, going by the diagram given in that site, when the both the inputs are zero, both the diodes are forward biased and start to conduct. but how i get logic 0 as the output despite the diodes conducting.
i presume the load resistance connected to + Vcc plays a part in this, but i don't understand the concept here, that is how this load resistance plays a role in making the output to logic 0 despite the diodes conducting.
please help sir.

 

[Pranab bhuyan]

HEY someone give me the applications of AND gate and OR gate using diode only

 

[paranormal]

AND and OR gates using diodes are basic building blocks in digital logic circuits. These gates are used to perform logical operations on binary signals, where the output is determined by the input combinations. AND gates produce a logic HIGH output only when all inputs are logic HIGH, while OR gates produce a logic HIGH output when any of the inputs are logic HIGH.

One application of AND and OR gates using diodes is in the design of digital circuits, such as in computers and electronic devices. These gates can be used to perform logical operations on binary signals, which are then processed and used to control various functions in the device.

Another application is in the design of logic gates for arithmetic operations. By combining AND and OR gates, more complex operations such as addition, subtraction, and multiplication can be achieved.

In the case of AND gates, the use of a pull-down resistor is important in order to ensure that the output remains low when both diodes are forward biased. This is because in an AND gate, the output is determined by the input with the lowest voltage. The pull-down resistor provides a low resistance path to ground, preventing the output from being pulled up by the forward biased diodes.

Overall, the use of AND and OR gates using diodes allows for the efficient and reliable processing of binary signals in digital circuits, making them essential components in modern technology.