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Question:
a) Describe five advantages of LED lighting over conventional incandescent lighting.
b) State two impairments that reduces the radiant flux of a surface-emitting LED. Illustrate one way how any one of these impairments may be addressed?
c) Illustrate how white light can be generated using a blue Gallium Nitride (GaN) LED.
d) Find the composition of the quaternary alloy In1-xGaxAsyP1-y for making semiconductor LEDs operating at 1.27μm. The bandgap energy Eg of the quartenary alloy in eV is then given by the empirical relationship Eg = 1.35 - 0.72y + 0.12y2 where y=2.2x. e) Given a particular Gallium Nitride (GaN) Edge-emitting LED drawing a current 50 mA when the voltage is 1.5 V and operating at 450 nm wavelength with light power of 5 µW coupled with a 9 µm single-mode fibre.
i) What is the colour of the light emitted from the LED? ii) Calculate the overall efficiency of the LED. iii) Calculate its internal quantum efficiency given that Tr = 50ns and Tnr = 70 ns. iv) Hence, calculate the internal optical power generated by the LED.
How to prove that heat and work is a patha function?
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find the output Y in the circuit
Q. Use of N-channel JFET? Generally, N-channel JFETs are more commonly used than P-channel. With no voltage applied between gate and source, the channel is a wide-open path for
Consider the circuit of Figure (a) with v S (t) = 10 cos ωt. Use the piecewise-linear model of the diode with a threshold voltage of 0.6 V and a forward resistance of 0.5 to dete
HILDA ( Output) It is called hold acknowledge signals it is active high i e it goes high when microprocessor receives HOLD signal.
a. Describe the memory allocation schemes in an embedded system. Also give a short-note on extended memory. (6) b. Consider a byte - addressable computer with 16 - bit addresses
Find I and V in the figure using ideal diode model
a) Provide pertinent summary of the basic principles behind ECG monitoring b) Using MATLAB, provide plots of the "clean" and "noisy" ECG signals. Investigate the spectral es
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