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An ideal n+/p diode has only the quasi neutral p region of length L illuminated with light such that GL electrons/cm3-s are generated uniformly throughout the region. There is no photo-generation occurring elsewhere in the diode. Derive the current vs. applied voltage VA for thisdiode by answering the following questions. Since the diode is n+/p, we need only determine excess carrier concentration on the p side of the device.a) Following the ideal diode derivation, where in the diode will the current density be evaluated?b) What is the simplified form of the minority carrier diffusion equation in the quasi-neutral p region of the diode? What is the general form of the solution?c) What are the boundary conditions for the quasi p region of the diode assuming an external voltage VA is applied and light is illuminated on the p side? Assume L approaches an infinite value (i.e. L >> Ln ) and any injection of excess carriers is low level.d) From the general solution and the boundary conditions, determine the expression for the I-V characteristics of this photo-diode.
A farmer owns two barns; one north of a creek and the other south of the creek. The farmer has a Cabbage, a Goat, and a Wolf. The Farmer needs to put each item in a barn every night. If the Cabbage and Goat are in the same barn
a radio antenna operating at 1.5 MHz has an input impedance of 6+j226 ohms. A capacitor is connected in series with it for tunning purposes. compute the valur of capacitance needed to tune the antenna to resonance.
(a) Show that the actual response at f=fT is approximately 9dB below the maximum value. What is the phase angle at this frequency (b) what is the slope of the magnitude plot for f>>fT What is the phase angle in this frequency range
Two short antennas each of length 10cm at the origin carry identical currents of I = 5 Sin (wt). One is in the az direction and the other one is in the ay direction. If the frequency of the antenna is 60 MHz then calculate
a.) What isthe minimum sampling frequency to avoid aliasing b.)If the sampling frequency of fs=2500 samples/sec is used how many samples must be taken to give a frequency resolution of 10Hz
Two data streams are coming serially to a system. These two streams are carefully observed and if considering any three bits from each stream, we observe that these two input streams are equal ; the FSM gives a signal to an alarm system.
give the definition of electrical circuit. draw the simplest electrical circuit and mark the directions of electrical values in it and ohms law. what are the main and the additional elements of the electrical circuit and that are the purpose.
An overhead line with an inductance of 1.33 mH/km and capacitance of 8.34 nF/km is connected to an underground cable with an inductance of 0.266 mH/km and capacitance of 166 nF/km.
A 450 piece/hr 10 hr B 500 piece/hr 8 hr A set of unsharpen ed tools costs $1,500 and can be ground 15 times. The cost of each grinding is $20. The time required to change and reset the tools is 2 hours, and such changes are made by a tool-setter.
A CT signal x(t) can be depicted as follow. It is a periodic function with T0 = 1 micro sec, and amplitude A = 1. The second signal y(t) is a sinusoid function with the fundamental frequency of 900 MHz, i.e., y(t) = cos(2*pi*fc*t)
A 6 pole round rotor 3 phase star connected synchronous machine has the following test results: Open circuit test: 4000 V line to line at 1000 rev/min, 50 A rotor current Short circuit test: 300 A at 500 rev/min, 50 A rotor current
Induction motor Y connection at 60Hz with the following: A.) 400 kVA induction motor running at 80% load with effeciency of 96% and p.f.=.88 b.) 40kW resistance heating source
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