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(a) What do we mean by "deep" versus "shallow" traps? Which are more harmful for semiconductor devices and why? What is an example of a deep trap in Si?
(b) Are absorption lengths of slightly above band gap photons longer in Si or GaAs? Why?
(c) Do absorption coefficients of photons increase or decrease with photon energy? Why?
Estimate how far away a cicada can be heard if the lowest possible audible intensity of a sound it produces is 9 × 10^-10 W/m2 and the power of the cicada's sound source is 3 × 10^-6 W.
Draw a schematic of the set up and calculate the force on the bar.
A 2400-115V transformer has a sinusodial flux expressed by φ=0.113 sin 188.5t. determine the primary and secondary turns.
Complete the electrical power system for the fish tank. At the start of class, the instructor will evaluate your electrical power system according to Checklist 2, which is available on the Homework page of the class web site.
A two-resistor voltage divider consists of a 10 k and a 15 k ohm resistor, with the 10 k resistor connected to the voltage source and the 15 k resistor connected to ground. If the output voltage is 2.5 V across the 10 k resistor
An amplifier has three amplification stages and a 1-dB attenuator in cascade. Assuming that all impedances are properly matched, what is the overall gain if the amplification factors are5, 10, and 6dB
Compare the noise floor in dBm with the GSM system (BW= 200 kHz) used by the European cell standards (available today in the US thru the AT&T acquired from the Cingular systems) assuming the same noise figure (NF) of 10 dB for the same receivers.
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?
What does a small delay spread indicate about the characteristics of a fading channel. If delay spread is 1microsecond, will two different frequencies that are 5 MHz apartexperience correlated fading.
Plot the magnitude response of H(z) and W(z) on the same graph using a legend where W(z) is the adaptive filter using the final values for the weights.
Design an amplifier circuit that will selectively amplify dolphin social conversations. The microphone can be modeled as a sinusoidal voltage source with peak amplitude less than 15 mV in series with a 1 ohm resistor.
Design an adder that computes the sum of four 8-bit numbers, using 8-bit carryripple adders. Use a basic 8-bit carry-ripple adder as a building block for the design.
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