Ï€ or pi Network in Network Analysis: Consider following two port ’π’ or pi Network type network with assumed voltages V1 and V2 and current I1 end I2 as shown in Fig. 6.11. Let the…
Photovoltaic Cell Working Principle and Types of Photovoltaic Cells: The Photovoltaic Cell Working Principle or solar cell, produces an electrical current when connected to a load. Both silicon (Si) and selenium (Se) types are known…
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 the transistor is in the…
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 simple representation of the Phototransistor…
Photon Absorption Coefficient: Photon Absorption Coefficient - When light falls on a semiconductor, the photons may be absorbed or they may propagate through the semiconductor depending on the photon energy (E) and the band gap…
Photoemissive cells or Tubes - Working Principle and Types: These Photoemissive cells or Tubes devices are basically of two types namely vacuum type and gas filled type. 1. Vacuum Type Photocell (or Phototube):Â This device essentially…
Photoelectric Transducer Working Principle: Photoelectric Transducer can be categorized as photo emissive, photo-conductive or photo-voltaic. In photo emissive devices, radiation falling on a cathode causes electrons to be emitted from the cathode surface. In photo…
Photodiode Operation and Characteristics: Photodiode Operation - When a pn-Junction is reverse biased, a small reverse saturation current flows due to thermally generated holes and electrons being swept across the junction as minority charge carriers.…
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 on one hand and the…
Photodarlington Working: The Photodarlington Working shown in (Fig. 20-33) consists of a phototransistor connected in Darlington arrangement with another transistor. This device is capable of producing much higher output currents than a phototransistor, and so…
