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We have derived the current-voltage relationship of ideal p-n junctions. One of the assumptions was that the quasi Fermi levels are constant across the depletion region. However this is contradictory to the requirement that there is a (constant) current across the depletion region
a. Write explicit expression for Jn and Jp in only terms of carrier density, mobility, and Quasi Fermi Level (derivative of QFL)b. Compute the gradient(derivative) of the Electron and Hole QFL for a pn diode with Nd=2x1016 and Na=1x1017 cm-3, use mobilities for silicon and assume the current density is 103 A/cm2.c. Compute the width of the depletion region.d. Determine the potential drop across the depletion region and thus explain why it is appropriate to make the assumption that the quasi Fermi levels are constant across the depletion region.
A silicon step np junction diode has ND=2x1016 and NA=5x1016
a. Draw, to scale, the energy band diagram of the junction at equilibrium. N side on the left, label all energy levels clearlyb. Determine the built-in voltage and compare to your sketch in part a)c. Determine the junction widthd. Determine the junction capacitance (per ?m2)e. Determine the width of both the n and p-side depletion regionsf. Accurately plot the electric field, identify the max electric fieldg. Accurately plot the minority carrier injection current density versus bias Va=-2 to+2V, use 300K Silicon material parameters where needed.
A transistor amplifier has a midband gain of -120, a high cutoff frequency of 36 kHz, and a bandwidth of 35.8 kHz. In addition,the actual response is also about -15 dB at f=50 Hz. Write the transfer function for the amplifier.
A 5mm-long 100W microstrip line with velocity factor of 0.4 is used to fabricate a resonator at 3GHz. It is connected to an inductor at one end. Determine whether the other end of the microstrip line should be short circuited
A three-phase, 2300-V, 60-Hz, cylindrical-rotor synchronous motor has a synchronous reactance of 10 ohms per phase and negligible armature resistance. The motor delivers 250 hp at a power angle of 20 electrical degrees, and the efficiency is 90%
A causal discrete LTI system is described by y(n)-3/4 y(n-1)+1/8 y(n-2)=x(n) where x(n) is the input and y(n) is the output Find the response of the system if x(n) =u(n)
A 150-KW, 300 V shunt generator has Ra= 0.1ohms and Rf=60ohms, If the generator operates at the rated voltage, calculate the induced voltage at (a) full-load (b) half-full load (which means the load current is half)
Compare and contrast transmit and receive diversity. Describe how each diversity type lead to an improvement in system performance.
How to Convert Capacitor Farads into kVAR & Vice Versa ?
salut a tous je suis eacutetudiant en fin de cycle option eacutelectromeacutecanique et je voulais savoir les
Frequency Response
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what is the formula in order to calculate peak to peak voltage assuming you your are given the currect in rms for the source the source resistance the delivered power and load resistance
It is required that the network be stable and that no component of its response decay more rapidly than K1e^-3t. Show that these conditions are satisfied if K2>0, |K1| 3K1. Crosshatch the area of permitted values of K1 and K2 in the K1-K2 plane.
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