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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 this diode 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.
Design a 4-bit serial equality comparator. That is, if we have a3a2a1a0=b3b2b1b0, then eq=1. Note that a3a2a1a0 is stored at register 1, while b3b2b1b0 is stored at register 2.
A 1900x10^(-6)F capacitor, intially cahrged to 120V, is discharged by a steady state of 120x10^(-6)A how long does it take to discharge the capacitor to 0V
What is the clearance requirement for a 120/240 V, single-phase, three-wire service at the point of attachment to the building Over the driveway Over the main roadway
Given a 1-phase 50 kVA 12.47 kV pf = 0.8 lagging static load a. Modeling the load as constant complex power, determine the correct value for S and I. b. Modeling the load as constant complex impedance, determine the correct value for Z and I.
An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver's temperature is 270 C and the load resistance is 50 .
What is the impedance of a resistor R in parallel with a series combination of a capacitor C and an inductor L? Assume angular frequency omega(w).
A three phase synchronous motor has the synchronous reactance of 2.1 Ohm and draws 250 A with a lagging power factor for an excitation voltage of 1327 -15 degree per phase. Find the terminal voltage of the motor and power factor of the motor.
A 3-phase transmission line series load of 2000MVA, .8 p.f. lag at 735 kv. The ABCD parameters of the line are : A = .8746 =D, B = j128.33Ω, C = j.0018315 (s). Calculate Vs, Is, voltage regulation and efficiency of the line.
A PN junction has Na=10^19 cm^-3 and Nd= 10^16 cm^-3. a) with V=0 what are the minority carrier densities at the depletion region edges Assume V= 0.6 V for (b)-(d). b) What are the minority carrier densities at the depletion region edges
Assume the z0 is in the far field and derive an expression for the strength to return as a function of angle. Make approximations where appropriate and do not forget the sidelobes.
Do either or both of the reasons you gave in part (a) above also apply to a point to point voice link using frequency modulation? c. Which parameter of an FM transmission determines whether it is wideband or narrow band?
(1) What is the difference between a series and a parallel circuit (2) How do you evaluate the total resistance of a parallel circuit
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