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A semiconductor has Nc=10^19 cm^-3, Nv=5x10^18 cm^-3 and Eg=2eV. If it is doped with 2x10^17 acceptors (fully ionized), calculate the electron, hole and intrinsic carrier concentrations at 627 C. Sketch the simplified band diagram, showing the position of Ef
A 1.55 micro meter fiber-optic communication system is transmitting digital signals over 100 km at 2 Gb/s. The transmitter launches 2 mW of average power into the fibre cable, having a net loss of 0.3 dB/km.
A liquid level system converts a 4-10 m level into a 4-20mA current. Design a three mode controller (PID im assuming) that outputs 0-5 volts with 50% PB, 0.03 min integration time, and 0.05 min derivative time. Fastest expected change time is 0.8 ..
A box contains a shipment of N (N>4) computer chips, of which four are defective. Four chips are randomly selected and examined as to wether or not the chips are defective. Describe the sample space for this experiment.
In addition, the distance between the components of the exciton is always such that there are intervening semiconductor atoms. Thus e in the Bohr formulation must also be replaced by Ks e0, where Ksis the semiconductor dielectric constant.
A point source light of 9000 cd is mounted 3.3m above the centre of a work bench.The bench measures 4m x 4m, what is the illumination on the corners of the bench ?
The band-limited continuous signal x(t) is sampled with impulse train p(t) with sampling period of T seconds. The output of the sampling circuitry is converted to sequence and is passed through a discrete time system with input of yin[n]
With vs = 3sin200tV, R1=20kohms, Cf=5uF, vc(0) = 1.5V. 2. Calculate the output voltage and the output waveform of the circuit.
Maximum value of frequency deviation is fixed at 75 kHz for commercial broadcasting by radio. Modulation frequency W = 15 kHz, then find the transmission bandwidth of signal and deviation ratio.
For the system described by the following equations, with the input x(t) and output y(t), determine which are invertible systems and which are noninvertible. For the invertible systems, find the input-output relationships of the inverse system.
What is the feedback factor. If a manufacturing error results in a reduction of A to 103, what close-loop gain results? What is the percentage change of Af corresponding to this factor of 100 reduction of A.
Assuming that a 12-bit ADC channel accept analog input ranges from 0 to 20 volts, determine the following a) number of quantization levels b) step size of the quantizer or resolution
A triangular loop is placed in the x-z plane. Assume that a dc current, I = 2A ,flows in the loop and that B = 30az mWb/m exists in the region. Find the forces and the torque on the loop.
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