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Silicon has an absorption co-efficient of 850 cm-1 at a wavelength of 805 nm. Light of intensity 1 W/m2 at this wavelength is directed at normal incidence onto a polished silicon wafer of thickness 0.5 mm.
a. Assuming a top surface reflectance of 30%, calculate the photon flux in units of photons/m2/s at a depth of 20 microns.
b. Calculate the generation rate of e-h pairs per unit volume at this depth.
c. The reverse of generation can also happen: Recombination in the bulk or at the surface. Describe using an energy band diagram three types of recombination in solar cells.
If R2 = 2R1, R3 = 3R1 and the total power taken by the circuit is 480 watts. Calculate the power in each resistor
Determining how to use the function fft to find the DFT coefficients X[k] of x[n] in Matlab. Also, how would you plot the magnitude of X[k] in Matlab?
What is the maximum message bandwith for which the system operates satisfactorily? Determine the output signal to quantizing noise ratio when a full-load sinusoidal modulating wave of frequency 1 MHz is applied to the input.
A Si sample is doped with 10^17 As atoms/cm^3. What is the equilibrium hole concentration P0 at T=300K?
What is the value of RTH?
State Carson's rule for bandwidth estimation. What does it reduce to for NBFM and WBFM and d erive an time domain expressionfor the output xd(t) of the system
Use Microsoft Excel to compare costs from at least three different vendors and reasons to accept specific bids. (May use graphs in Excel to provide a better visual comparison)
S = {c(k + jl) | k = 3, 1, 1, 3 and l = 3, 1, 1, 3 and j = square root of -1, where c is a constant. Determine the value of c to ensure a unit energy constellation. Sketch this constellation. Find d^2 min and label the constellation points with bi..
An electric pencil sharpener is rated 240 mW, 6 V is connected to a 9-V battery and a series-dropping resistor Rx needed to power the sharpener. Calculate the value of the series-dropping resistor Rx needed to power the sharpener.
How tall must the antennas be if the link operates on a frequency of 2.450Ghz, D1=5miles, D2=11miles, and the obstruction is 60 feet high?
Implementation your algorithm using VHDL under Quartus. You are free to select the structural hierarchy of the implementation; the implementation could be behavioral, structural, or a mixed implementation. which the linear interpolation is to be e..
What causes the current gain to decrease both in the case of a low collector current and at a high collector current?
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