EC ELECTRIC CIRCUITS AND ELECTRON DEVICES the equivalent circuit of UJT and explain its operation. Write short notes on light activated SCR. 2nd Semester CSE Notes: 1. Basic civil & Mechanical Notes and Question answers – View. 5. Electron Devices & Electric circuits (EC) – Unit 1 – View /. PH Engineering Physics 2 Anna University Notes: PH Engineering notes (EM notes – ME Notes) – DOWNLOAD EC
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It has long life time. So, it is called as Unipolar device.
EC Electric Circuits and Electron Devices ECED Notes
It reaches at the junction J 2 breakdown. Node voltage method The node voltage method of analysis solves for unknown voltages at circuit nodes in terms of a system of KCL equations. Write short notes on light activated SCR. LED structure can be divided into two categories. Inverse Nottes transforms permits going back in the reverse direction i. The gates are connected together. Therefore there are two conditions which are limiting the reverse voltage swing and the capacitance variation.
It is also called Photo detector.
Varactor diode Varactor diode is a specially manufactured reverse biased PN junction diode with a suitable impurity concentration profile. Where is the Menu?
EC Electric circuits and electron devices Lecture Notes- V+ Edition
Operation When a tunnel diode is under unbiased condition then there will not transfer of electrons from n-side to p-side hence the net current will be zero. These excess minority carriers diffuse through the junction and recombines with the majority carriers in n and p region respectively to produce light.
It also exhibits a negative resistance characteristic which allows it to be used as an oscillator. These coefficients fall on a diagonal. These excess minority carriers diffuse through the junction and recombines with the majority carriers in n and p region respectively to produce light. Write a KCL equation for each node 1,2, Maximum Power transfer Theorem: Characteristics of Varactor diode The diode conducts normally in the forward direction.
Advantages High speed operation Ease of operation Low noise Low cost Low power Disadvantages It is two terminal device, there is no isolation between the input and output circuit. It is a quantum —mechanical behaviors.
Second Semester Anna University lecturer notes
Derive the relationship to express three delta connected resistances into star. Voltage range over which it can be operated is 1 V or less. Parallel Resistance Two elements are in parallel if they are connected between share the same two distinct end nodes.
Operation When a tunnel diode is under unbiased condition then there will not transfer of electrons from n-side to p-side hence the net current will be zero. Third method is forced commutation. When the reverse voltage is increased width of the depletion layer increases at the same time the electrons due to force of e2151 by the plates acquire ntoes high velocity and during their motion inside the diode they collide with the electrons in covalent bonds and bring them out.
The carrier inversion is the first requirement of lasing. To reduce the holding current, it can be turned OFF. Selectivity Selectivity is defined as the ratio of bandwidth to the resonant frequency of resonant circuit. In Zener diode first zener breakdown occurs and later avalanche breakdown.
Response time of LED is very fast in the order of 10 9 seconds. It reaches at the junction J2 breakdown. The photon energy is given by the band gap, which depends on the semiconductor material.
There is no light falls on the sensor the resistance is very high and the current is low. When reverse voltage increased at once electric field the electrons which are present in the covalent bond are brought due to strong force of attraction.
Parallel resonance is also known as Anti resonance. Resonant Circuit The circuit that treat a narrow range of frequencies very differently than all other frequencies are referred to as resonant circuit.
PIN diodes are used in microwave switches. Such curves are known as Static characteristic curves. It is relatively immune to radiation. It can be triggered ON by a light input on the gate area, but does not turn OFF, when light source is removed.
This diode is uses the tunneling phenomenon.
These particles move in opposite direction in an electric field. It combines a photodiode and phototransistor. Once when this breakdown occurs the diode gets damaged.
Now we plot a graph with anode current and anode cathode voltage. Used for applying input power to lasers.