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Draw energy band diagrams, for k lying between 0 and pi/a (take a=5Ã), for a material whose valence band follows the equation:
Ev= - Ak^2
(E-Ec) = B (k-k1)^2
where k1= 0.2 pi/a
Ec=1.0 eV
A=0.5xB
B=1 eV/[( pi/a)^2]
and calculate the effective masses for conduction and valence bands.
A certain signal is modeled by a continuous Gaussian random process X(t) with mean E {X(i)} = 2 and autocorrelation function R(t, r) = 4 + e-0.5|r|. Compute the covariance function C(t, r). Compute the variance of X(t). Write the PDF for a single ..
An experiment consists of tossing a fair coin four times in succession. What are the possible outcomes Now count up the number of outcomes with three heads. If the outcomes are equally probable, what is the probability of three heads
Compute the equilibrium carrier concentrations and the position of the Fermi level with respect to the conduction band edge for a uniformly doped Si region with N_D=1*10^16 cm^-3 and N_A = 1*10^17 cm^-3 at room temperature.
What are the essential features of an ideal op amp? Identify the terminals of an op amp. Draw its equivalent circuit. Define virtual ground and what is difference amplifier? Draw its circuit. Define C.M.R.R.
Now assume that the doctor knows that 1 in 100 individuals with symptom G will have the rare disease, and he only orders the test when individuals have symptom G. Given that one of the doctor's patients tests positive.
A signal has a band width of 15 hz. The Signal is sampled , quantized and binary coded to obtained a PCM signal. Suppose the reconstruction pulse used is p(t)= rect ( (5t / Ts) - 0.5), where Ts= 1/ fs. Specify the equalizer filter E(f) to recover t..
The scale current Is is proportional to the junction area of a diode. A diode D1 with a rating of 3mA is connected in series with another Diode D2 with a junction area 27 times that of D1. 1) What will be the rating of the series combination
A byte containing 01100011 is right shifted (right-most bit first) into an 8-bit shift register with an initial state of 00110110 (01100011=>00110110) What does the shift register contain after three clock pulses
Calculate the 5 lowest possible energies of an electron in a hydrogen atom in units of electron volts. Identify all possible electron energies between the lowest energy and 2eV.
Determine the source voltage Vs of a 60-Hz power transmission system from the loading conditions described as follows: 1. The load is capacitive and absorbs 12 kW at 240
(a) Determine free electron and hole concentration.(b) Calculate the effective density of states at valence band, Nv. Given that ni = 1x1010 cm3 and kT = 0.026.
A plane circular disk of radius 0.25m rotates at a speed of 200 rad/s about an axis through the center of the disk perpendicular to the plane of the disk. There is a uniform magnetic flux B = 1 Tesla parallel to the axis of rotation.
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