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A pn junction may be formed by depositing a single crystal film of uniformly doped p-silicon onto a substrate that has been doped n-type. The substrate is 500um thick, and the film is 20um thick. The substrate has a 5 ohm-cm resistivity.
a) If the film is doped 1015boron/cm3, find Vbi, W, xp and xn at equilibrium.
b) Repeat a) but for 1017boron/cm3 . How have things changed?
c) Draw a circuit schematic showing a bias of +0.5V applied to each diode and recomputed W for both devices.
d) Repeat c), but for -10V bias. Discuss how things are changing.
e) Finally, under the -10V bias, put a 15mV ac voltage is series with the DC bias. Explain what will happen in the device in terms of W and the free charges.
An 8mm thick brass [E=83 GPa; v = 0.33] plate is subjected to biaxial stress with sigma x = 180 MPa and sigma y = 65 MPa. The plate dimensions are b = 350 mm and h = 175 mm.
A given peripheral has 3 address lines (allowing access to 8 internal addresses) and requires that address lines A2-A0 to be used. It is desired that this peripheral occupy the hex address range, EB80-EB82 in a given computer system memory map
A sinusoidal voltage has maximum amplitude of 90 V. The voltage passes through one complete cycle in 64 ms. What is the frequency of the voltage in hertz
Measurements show that for a particular arrangement of the equipment and at a particular amplifier setting, the system will howl if 1% of the output power is fed back to the microphone. Estimate the power gain of the P.A. amplifier in decibels.
How do the short length and medium length transmission line models differ and why Draw the equivalent circuit of a medium-length transmission line
A Y-connected load has an impedance of 25+j12 ohms in each phase. It is desired to raise the load power factor to .95 lagging. (a) What size capacitor should be placed in parallel with each phase impedance if frequence = 60 Hz
discuss to describe as best as possible an automatic garage door opener system. You should either use one you are familiar with as an example, or recall the details from one or more that you imagine could be available
Consider an ideal op-amp in inverting amplifier configuration with feedback impedance Rf=6ohms and an input impedance consisting of a series RL: Ri=6ohms and Li=5H. Let h(t) be the impulse response of the overall amplifer.
design op amp circuit to produce output vout which is related to inputs v1, v2 and v3 by expression vout= -(3v1+5v2+8v3). assume max permitted resistor value= 200k. use only one op amp
For a discrete-time LTI system, the imput signal is x[n], impulse response is h[n] and output is y[n]. Analytically determine the output y[n] in each of the above cases. x[n]=anu[n-2],|a|
Compare the readings of two ammeters of unequal resistance when placed in parallel with each other and the combination inserted in series in a circuit.
A. Make a two bit counter with The input X =0 makes the counter count from 0-3-1-0 and X=1 goes from 0-1-2-3-0. Choose two different types of flip flops to implement it. B. Describe what will happen on your circuit when the present state is 2 and ..
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