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A silicon p-n-p BJT was designed to have doping levels of 1020 cm-3, 1015 cm-3, and 1017 cm-3 in different parts. a. Identify which doping level was intended for the emitter, for the base, and for the collector. b. Assuming the intrinsic carrier concentration (ni) in silicon to be 1010cm-3, calculate the Fermi Energy, EF, relative to the intrinsic Fermi energy, EFi for each layer. c. Hence draw the energy band diagram for the BJT labelling the energy scale clearly to show the relative positions of EF and EFi across the structure. d. Calculate the built-in potential at each junction in equilibrium (no bias conditions).
a) Assume B1 = ax2 - ay10(mT), find B2 and the angle that B2 makes with the interface. b) Assume B2 = ax10 +ay2(mT), find B1 and the angle that B1 makes with the normal to the interface.
A lamp of 100 candela is placed 1 m below a plane mirror which reflects 90% of light falling on it. The lamp is hung 4 m above ground. Find the illumination.
A dc machine is rated 5 hp with V_f = 240 V, V_a = 240 V, r_a = 0.63 ohms, and L_AF = 1.8 H. At rated condtions w_r = 127.7 rads/s and the total resistance of the field circuit is 240 ohms. a) Calculate the rated armature current.
Writea program to simulate a lottery drawing that uses balls numbered from 1 through 10. Assume that three balls are drawn at random (Userandom numbers or allow user to input the number of lotterydrawings to simulate the random ..
A series circuit consists of a 220V- source and 10k-ohm, 40k-ohm, and 60k-ohm resistors. Draw the circuit and find the voltage across each resistor.
A runner should STEAL a base if and only if the manager pulls his EAR and BOWs while patting his HEAD, or if he lifts his LEG and pats his HEAD without BOWing, or anytime he pulls his EAR without lifting his LEG. Sketch a minimal circuit that coul..
Consider the current it takes to power a +5V 74xx245(Icc). What is the qualitative difference between the CMOS devices and the non-CMOS devices and the non-CMOS devices What is the explanation for the difference
Discuss how can identify which resistances are in series and which ones are in parallel in a series-parallel circuit. How might this affect how you measure current and voltages in the circuit with a digital multimeter
A sinusoidal signal described by Cos (2pit+pi/4) passes through a linear time invariant (LTI) system that applies a gain of 2 and a time delay of 0.125 seconds to the signal. Write the mathematical expression that decribes the signal that will com..
Design a circuit that has 4 inputs, WXYZ, and two outputs, f and g, where W is the most and Z is the least significant bit. The output f is asserted whenever the two-bit number WX is greater than the two-bit number YZ.
The required exposure energy for a positive photoresist is 140 mJ/cm2 and for a negative photoresist is 9 mJ/cm2. Assuming negligible times for loading and unloading wafers, compare the wafer throughput for positive photoresist and negative photor..
draw a state diagram for an FSM with an input gcnt and three outputs x,y, and z. The xyz outputs generate a sequence called a Gray code in which exactly one of the three outputs changes from 0 to 1 or from 1 to 0.
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