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(For these problems use typical room temperature bulk Si hole and electron mobilities: hole -> 460 cm^2/V-sec and electron -> 1360 cm^2/V-sec)
1. A Si wafer is doped with Na = 5x10^16 /cm^3 of acceptors. In equilibrium at T=330K calculate, list the following for the Si wafer: Eg (Energy gap), ni (intrinsic concentration), n,p - the free electron and hole concentrations, Ef - Ei (in eV), the net charge density in the sample, the resistivity of the sample
2. The resistivity of comparably doped N type material is smaller than comparably doped p-type material. Explain?
3. Calculate the resistivity of intrinsic Si and room temp T=300K
4. The total resistance of a Si sample shaped as a rectangular bar is given by R = p* L / A where L and A are the length and cross-sectional area of the sample and the resistivity. If you need to make a 600 ohm resistor from n N type Si sample that is 2 cm long and has a cross sectional area of 10-2 cm^2 determine the doping required.
Needs to oscillate 5 times per second. Amplitude envelope increases 25% every second. Amplitude is 1 at t =0. The derivative at t = 0 is 54.6371. the sinusoid has to be a cos(2*pi*5*t) for the exponential exp(at).
Describe and explain drift current and diffusion current in a PN junction in thermal equilibrium. What causes each In which directions are the electrons, holes, electron current, and hole current flowing for each effect
Design a DC power supply that provides -95v +/- 5v to a 2 amp load (energy absorber). The input source is a 100 volt peak sinusoid, 60 Hz. You may use any basic circuit element. State the values of all circuit elements (in ohms, farads, etc).
a sample of gas composed of 5.7 grams of carbon dioxide and 3.6 grams of neon in a container with volume 5.7L and temp 67 degrees Celsius. what is the pressure of the gas mixture
At a point f in the system, there is an open-circuit fault on phase-a with a voltage across the open-circuit as Vfa , whereas Vfb =Vfc =0. Similar to the calculations of the short-circuit currents by making use of the sequence networks
If the efficiency of the motor and drive system is 80% and it is fed through a transistor regulator at 12V, what is the mean current through this regulator when the printer is working continuously?
Determine the gain K so that the phase margin is 45 degrees. For the gain K selected in part (a), determine the gain margin. Predict the bandwidth of the closed-loop system.
When a 100-k load is connected to a signal source, the output voltage is 30 mV. If a 10- k resistor is used to load the same signal source, the output voltage is observed to be 10 mV. Find the corresponding Thevenin voltage, Norton current
There is a 3 ohm resistor and j4 ohm inductor in series with each other. There is a 4 ohm resistor, a -j13 ohm capacitor, and a 10 ohm resistor in series with each other.These two series circuits are in parallell with each other.
If 15 newtons of force is applied to a surface and the pressure is measured as 4,000 Pascals, what is the area of the surface in units of square meters
How much power (in watts) is transferred to or from the inductor when the time is 1 ms? The current flowing through the inductor is given by 5e^-200t The inductance is 107 mH
A somewhat discharged automotive battery has an open-circuit voltage of 12.5 V and supplies 50 A when a 0.1-? resistance is connected across the battery terminals.
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