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A silicon p-n-p BJT was designed to have doping levels of 1020 cm-3, 1015 cm-3, and 1017 cm-3 in different parts.
a. Identify which doping level was intended for the emitter, for the base, and for the collector.
b. Assuming the intrinsic carrier concentration (ni) in silicon to be 1010cm-3, calculate the Fermi Energy, EF, relative to the intrinsic Fermi energy, EFi for each layer.
c. Hence draw the energy band diagram for the BJT labelling the energy scale clearly to show the relative positions of EF and EFi across the structure.
d. Calculate the built-in potential at each junction in equilibrium (no bias conditions).
Design a 0-1-2-3-0 counter circuit using flip flops. Flip flop A (most significant bit) is to be a T flip flop and Flip Flop B (leats significant bit) is to be a D flip flop.
Let x[k] be a time-domain sequence and X[r] be its DFT. (When written as vectors, unless stated otherwise, always assume the first entry in the vector is at k=0 or r=0, respectively.) If x[k] = [5, 9, 6, 10]
A low pass filter has a cut-off frequency of 8kHz and a high pass filter has a cut-off frequency of 5kHz. These two circuits are connected back to back in cascade to form an input-output system.
Draw the logic diagram for the 4-bit circuit, using full adders and multiplexers. Determine the arithmetic operation performed for each of the four combinations of S and Cin: 00, 01, 10, and 11.
Write the VHDL architecture file for a J-K flip-flop that toggles on each falling clock edge. Use J and K for the inputs, Q for the output, and CLK for the clock. All signals are BIT type.
A particle travels along the x-axis with postion ( measured in meters ) as a function of time ( measured in seconds ): x(t) = 5t^2-7t+2. (a) At what time or times is the particle at rest
A signal x(t) is sampled 4 times and the samples are {x[0], x[1], x[2], x[3]}. Its DFT harmonic function is {X[0], X[1], X[2], X[3]}. X[3] can be written as X[3] = a x[0] + b x[1] + c x[2] + d x[3]. What are the values of a,b,c and d
Suppose the FCC allocates 300 kHz channels for a high quality video conference service. A service provider decides that this service requires 720 kbps (not including overhead and error control) for each channel.
Explain the concept of Envelope detection for Large Carrier AM. Why is Large Carrier preferred over Suppressed Carrier method for Double Sideband AM in broadcast environment.
estimate results in the lights being switched on for an average of 19 hours per day - 6 hours more than needed. The room is lit with seven, 60 W incandescent bulbs, which you can assume are powered by a 115 V constant voltage source.
A Gaussian source with mean zero and variance 1 is to be transmitted via a channel that can provide a transmission capacity of 1 bit per each source output. a) what is the minimum mean-squared-error achievable
If an AM signal has an un-modulated carrier voltage Vc=A volts(pk) and a load resistance RL of B ohms. How to calculate the Pc (Carrier Power) If the modulation index is known as m, how to calculate the Sideband Power (Psb)
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