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An important advance in Si bipolar transistors is the use of polysilicon emitters. If a normal ohmic contact is made to an emitter, the injected minority density goes to zero at the ohmic contact boundary. In polysilicon emitters, heavily doped polysilicon forms the contact to the emitter. The minority density does not go to zero at the polysilicon contact, but decreases to zero well inside it. This allows one to have very thin emitter contacts for high-speed operation. Discuss the disadvantage of such a contact over a normal ohmic contact in a thin emitter. (Consider the emitter efficiency and how it is affected by a thin emitter by discussing the narrow p-n diode.)
A 1 F capacitor is being charged through a 100 Ohm resistor. How long will it approximately take for the capacitor to reach about 63% of its final charge
A silicon sample is 2.5 mm in length, 1.2 mm in width and 0.7 mm high. It has been doped with Boron with a doping density of 8.5 x 1016 cm-3. Assume the temperature is 300°K.
Calculate the probability of drawing 3 10 k resistors from a box of 500 resistors, where 495 are 100 k resistors and 5 are 10 k . Use your results from part (a) and (e) to find this probability. How many ways are there to draw 3 resistors from a bo..
The Karina Light Company manufactures inexpensive light-emitting diode (LED) bulbs whose estimated lifetime in normal distribution with a mean of 9000 hours and a standard deviation of 500 hours. Calculate the probability that the LED will fail wit..
Binary data is transmitted at the rate of Rb bits/sec over a channel occupying a bandwidth B and the channel SNR=3 dB. If the data bit rate is increased to 2.65Rb and the bandwidth is increased to 1.75B i.
Determine the ROM size and contents to implement a function which converts a sign and magnitude number from -5 to +6 to two's complement format.
A company has 100 metal halides (400W each with 1.2 ballast factor) and four motors (each with 50 hp capacity, 95% efficiency, 100% load factor, and 80% power factor). The power factor for the combined load
For a 64-PSK modulator with an input data rate(fb) equal to 36 Mbps and a carrier frequency of 100 MHz. A. Determine the minimum double-sided Nyquist bandwidth(fN) and the baud. B. Sketch the output spectrum.
given analog signal : x(t)=8cos(6,000pi)+5cos(14,000pit) t>=0 sampled at rate 12,000 Hz a) sketch the spectorum of the orignal signal and the sampled signal from 0 KHz and 25 KHz.
A portion of the wave will reflect from the load and propagate back down the line to arrive at the input once again. Find the power that returns to the input and express this as a loss in decibels when compared to the original 10W input.
In any chemical fabrication process (eg. wet etching or CVD) there are two main regions where the reaction rate is dominated by different processes. Name them and explain what each of those regions mean.
A -3.4 nC charge is on the x-axis at x_1 = -8 cm and a 4.6 nC charge is on the x-axis at x_2 = 17 cm. At what point or points on the y-axis is the electric potential zero
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