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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?
A circuit consists of a voltage source (Vin = 10 V at 75o phase shift, ω = 10 rad/s) in series with a parallel RL combination (R = 10 Ω, L = 0.5 H), which is in series with a capacitor (C=0.05 F). What is the value of Vo(t) across the capacitor
An ADSL signal uses 250 channels, each of 4 kHz bandwidth. Assume the maximum signaling rate to be 1 symbol/Hz. QAM is used within each channel with up to 64 point constellations. What is the bit rate/channel
A limited source diffusion is used to define the base of an npn transistor. Estimate the starting concentration of impurity if the base-collector junction lies 1micro-meter below the surface after 2h diffusion at 1100 degrees C.
Find the value of the constant such that the SNR at the output of the filter will be maximum. - what sampling time will the SNR at the output of the filter be maximized?
Figure P4.1 shows a neural network involving a single hidden neuron for solving the XOR problem; this network may be viewed as an alternative to that considered in Section 4.5. Show that the network of Fig. P4.1 solves the XOR problem by constucti..
When a sinusoidal signal is used to frequency modulate a VHF carrier, the required bandwidth is 200 kHz. It is desired to retain the same modulation index while reducing the necessary bandwidth to 100 kHz.
The system has total capacitance CT = 1.0 muF (10 ^ 6 Farad) and average frequency in use at 10kHz. The transformation of battery power to power inn the microcontroller and additional components occurs with virtually no losses.
Two heating elements with resistance R1 and R2 are to beused that can be operated in parallel, seperately, or inseries. The highest power is to be 1280W, and the lowestpower is to be 240W. Draw a cicuit diagram.A) What are the values needed for R1 ..
Generate an analogous diagram for a closed-loop controlsystem to maintain the water level in a tank that has a singleinlet valve (that can be controlled )and an unknown leak. Anexample of a closed -loop system such as this is the tank on a toilet.
Three full-size 50 X 100-mm boards are nailed together to form a beam that is subjected to a vertical shear of 1500 N. Knowing that the allowable shearing force in each nail is 400 N, determine the largest longitudinal spacing s that can be used b..
a). If the 8th bit is set to0, what is the minimum Hamming distance between the 8-bit ASCII character code words b). If the 8th bit is usedfor parity, what is the minimum Hamming distance between the 8-bitASCII character code words
(1) The load active input power. (2) The load input reactive power at the power at the factor of 0.6 lagging. (3) The load input reactive power at a power of 0.87 lagging
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