Define the External Quantum Efficiency (EQE) of an LED. Calculate its value for a semiconductor material with refractive index n₂ = 3.6; assuming the refractive index of the air = 1.
External Quantum Efficiency (EQE) of an LED refers to the ratio of the number of photons emitted from the LED into the air (external emission) to the number of electrons injected into the LED. It essentially quantifies the efficiency of an LED in converting _______ ______ __________ _____ ________ ____ _______.
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In single ended input-single ended output configuration of a differential amplifier, the input voltage is 5 mV. If the collector resistors RC1= RC2= 51kΩ, emitter resistor RE= 47kΩ and supply voltage is ± 10V, calculate the differential gain and output voltage of the circuit.
Draw the symbols of following diodes:
i) Varactor diode,
ii) Schottky diode,
iii) p-i-n diode
iv) Tunnel diode
Explain the origin of negative resistance in Gunn diode with the help of appropriate E-k diagram. What are the applications of Gunn diode?
Describe the five processes involved in the generation of microwaves in a vacuum tube device with the help of an example of a reflex klystron oscillator.
Explain with the help of a circuit diagram and appropriate waveforms, how an SRC can be used for motor speed control. Suggest the modification in the circuit to turn it ON beyond 90° phase of the input ac cycle.
Explain the working of a PLL using a block diagram. Why is the capture range of a PLL always smaller than its lock range?
With the help of a circuit diagram explain the working of an active full wave rectifier. What are the advantages of using an op amp in rectifier and filter circuits? What is the limitation of using an op amp in a high pass filter circuit?
Explain the working of a Schmitt trigger using an op amp with the help of appropriate circuit diagram. Design a Schmitt trigger circuit with hysteresis of 20% of