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Question:
a) Describe two mechanisms by which electrons can be excited from the valence band to the conduction band?
b) Given that the direct-band gap energy for Gallium Nitride (GaN) is 3.4 eV at room temperature, calculate the phonon energy and phonon momentum that you can expect from such a material with a lattice constant of 3.186 Å and velocity of sound of 5x103 m/s.
c) Given a P-type semiconductor with NA and ND atom concentrations of 8x1011 cm-3 and 3x103 cm-3 respectively, calculate the electron concentration assuming ni = 1.4x1010 cm-3.
d) What do you understand by the Fermi Level of a crystal? According to the Fermi-Dirac function, what is the temperature at which there is 1% probability that a state, with an energy 0.5 eV above the Fermi energy, will be occupied by an electron?
e) Given a piece of N-type silicon at 0 ºC,
i. Calculate the thermal velocity of an electron with an effective mass of 1.18m0 and a mobility of 0.25 m2V-1s-1.
ii. What is the electric field that needs to be applied to make the electron drift at a velocity of 1000 ms-1?
Binary Multiplication Multiplication can be seen as multiple additions. For example if we have to multiple 4 and 8 we can 8, 4 time to get the solution. Actually this conc
howw to plot amper circuital law through matlap
Pinch off Voltage: The current in N-JFET because of a small voltage V DS is described by: I DSS = (2a) W/L (qN d μ n V DS ) In which 2a = channel thickness
Q. What are the different types of dc generation according to the ways in which fields are excited. Show the connection diagram of each type. Ans. Types of D.C.
function of a commutator in a DC motor
The arm of a hydraulic robot is controlled as shown in the block diagram below: The arm dynamics are represented by: Dynamic specification for the arm requires:
Questions: a) Give a brief description of the program counter and the data pointer, including their differences. b) Briefly describe what are Byte-Level logical operations
Q. The loop gain of an elementary feedback control system(see Figure) is given by G(s)·H(s), which is 10/(1+s/2)(1+s/6)(1+s/50). Sketch the asymptotic Bode plot of the loop-gain fu
find the resultant of two forces 20N and25N acting at an angle 60 degree each other
Q. An operational amplifier stage is typically represented by the circuit of Figure. For the values given, determine V out and the power supplied by the 2.5-V source.
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