Phototransistor Construction and Working Principle: The sensitivity of a photo diode can be increased by as much as 100 times by adding a junction, resulting in an NPN device. A…
Phototransistor Working: A Phototransistor Working is similar to an ordinary BJT except that its collector base junction is constructed like a photodiode. Instead of a base current, the input to…
Electronics Engineering Multiple Choice Questions and Answers (MCQs) Part 4: 150. In phase modulation, phase deviation is proportional to (a) carrier amplitude. (b) carrier phase. (c) message signal. (d) message…
Optoelectronics Devices Interview Questions and Answers: 1.What are photonic devices? Ans. Photonic devices are those in which the basic particle of light (the photone) plays an important role. Photodetectors, solar cells…
IR Emitters or Infrared-emitting diodes: IR Emitters or Infrared-emitting diodes are solid-state gallium arsenide devices that emit a beam of radiant flux when forward biased. Fig. 25.53 depicts the basic…
Photodetectors - Definition and Applications: Photodetectors are the semiconductor devices that can detect optical signals through electronic processes. The extension of coherent and incoherent light sources into the far-infrared region…
Optoelectronic Devices Articles: Light Units: The total light energy output, or luminous flux (Φs), from a source can be measured in milliwatts (mW) or in lumens (1m), where 1 Im…
Optocoupler Circuit Operation: An Optocoupler Circuit Operation (optoelectronic coupler) is essentially a photo-transistor and an LED combined in one package. Figure 20-35(a) and (b) shows the typical circuit and terminal…