Q: Given : A and B are input terminals.Logic 1= > 5V Logic 0= < 1V Which logic gate operation, the following circuit does?

Since, when A and B both are logic 1 then no current will flow through the both 50\Omega resistors, because both the diodes will not conduct. therefore, whole current will flow through R=10K and output is potential difference across the R=10K which will be 6 V in this case means high Now, When either of the input is low current through terminal which is low will flow through it and most of the current will flow through the 50\Omega resistance since it is very very less than R=10K therefore, Potential across R=10K will be less than 1 V . Hence, when either of input is low output is also low.When both the inputs are low same case as when either of input is low will be there hence output will also be low.Therefore, above circuit acts as a AND Logic gate.

Q: In an unbiased n-p junction electrons diffuse from n-region to p- region because

In p-type materials holes are majority carriers and electrons are majority carriers in n-type materials. When the two types of semiconductor materials are joined together, the electrons from the n-type material diffuse into p-type material and combines with holes as their concentration is higher in n-type layer. This creates a layer of negative ions near the junction in p-type material. Negative ions are formed because the trivalent impurities (e.g., Aluminum) now has an extra electron from the n-type material. Similarly, the holes from the p-type material diffuse into n-type material resulting in a layer of positive ions in the n-type material.These negative ions creates an electric field in the direction from n-type to p-type. As more electrons diffuse into p-type material, the electric field strength goes on increasing. The electrons from n-type material now diffusing into p-type material will have to overcome the electric field due to negative ions. At one point, the electric field becomes sufficiently strong to stop further diffusion of electrons.

Question 1

Given : A and B are input terminals.Logic  1= > 5V Logic  0= < 1V Which logic gate operation, the following circuit does?

Accepted Answer

Since, when A and B both are logic 1 then no current will flow through the both   50\Omega resistors, because both the diodes will not conduct. therefore, whole current will flow through  R=10K and output is potential difference across the  R=10K  which will be  6 V  in this case means high Now, When either of the input is low current through terminal which is low will flow through it and most of the current will flow through the  50\Omega  resistance since it is very very less than  R=10K  therefore, Potential across  R=10K  will be less than  1 V  . Hence, when either of input is low output is also low.When both the inputs are low same case as when either of input is low will be there hence output will also be low.Therefore, above circuit acts as a AND Logic gate.

Question 2

In an unbiased n-p junction electrons diffuse from n-region to p- region because

Accepted Answer

In p-type materials holes are majority carriers and electrons are majority carriers in n-type materials. When the two types of semiconductor materials are joined together, the electrons from the n-type material diffuse into p-type material and combines with holes as their concentration is higher in n-type layer. This creates a layer of negative ions near the junction in p-type material. Negative ions are formed because the trivalent impurities (e.g., Aluminum) now has an extra electron from the n-type material. Similarly, the holes from the p-type material diffuse into n-type material resulting in a layer of positive ions in the n-type material.These negative ions creates an electric field in the direction from n-type to p-type. As more electrons diffuse into p-type material, the electric field strength goes on increasing. The electrons from n-type material now diffusing into p-type material will have to overcome the electric field due to negative ions. At one point, the electric field becomes sufficiently strong to stop further diffusion of electrons.

Semiconductor Electronics Materials Devices And Simple Circuits

Physics
423 Views

Given : A and B are input terminals.
Logic $1 = > 5 V$
Logic $0 = < 1 V$
Which logic gate operation, the following circuit does?

In an unbiased n-p junction electrons diffuse from n-region to p- region because

Semiconductor Electronics Materials Devices And Simple Circuits

Physics 423 Views

Given : A and B are input terminals. Logic 1=>5V Logic 0=<1V Which logic gate operation, the following circuit does?

In an unbiased n-p junction electrons diffuse from n-region to p- region because

Physics
423 Views

Given : A and B are input terminals.
Logic $1 = > 5 V$
Logic $0 = < 1 V$
Which logic gate operation, the following circuit does?